{
  "updated": "2026-09-13",
  "methodology": "https://tanklessgeek.net/how-we-review",
  "records": [
    {
      "model": "Eemax EEM24027",
      "brand": "Eemax",
      "reviewUrl": "https://tanklessgeek.net/products/eemax-eem24027",
      "sourceUrl": "https://www.eemaxtankless.com/products/eem24027/",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-09-06",
      "fuel": "Electric",
      "input": "27 kW @ 240 V",
      "ratedFlow": "Up to 5.3 GPM (warm climate)",
      "flowAtTemperatureRise": "5.3 GPM at 35 F rise; 4.1 GPM at 45 F rise; 3.1 GPM at 60 F rise; 2.6 GPM at 70 F rise",
      "efficiency": "99% efficiency",
      "serviceRequirements": "Three 40 A double-pole breakers (~113 A of dedicated capacity).; Panel headroom for the load — 100–150 A homes often need a subpanel.; ½\" flex connections (no soldering); a compact 14 × 10 in wall unit.",
      "warranty": "5 years limited warranty",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Marey ECO180",
      "brand": "Marey",
      "reviewUrl": "https://tanklessgeek.net/products/marey-eco180",
      "sourceUrl": "https://us.amazon.com/ECO180-Self-Modulating-Multiple-Tankless-Territory/dp/B0089WW89M",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-09-13",
      "fuel": "Electric",
      "input": "18 kW @ 240 V, self-modulating",
      "ratedFlow": "4.0 GPM",
      "flowAtTemperatureRise": "3.5 GPM at 35 F rise; 2.7 GPM at 45 F rise; 2 GPM at 60 F rise; 1.8 GPM at 70 F rise",
      "efficiency": "≈99% (electric resistance)",
      "serviceRequirements": "Two 50 A double-pole breakers with 6-gauge wire; ~150 A service recommended.; Panel capacity for the load — smaller services may need an upgrade.; Stainless chamber; a 13.8 × 10.3 in wall unit; ETL certified.",
      "warranty": "5 years limited warranty",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Gasland CE528LP",
      "brand": "Gasland",
      "reviewUrl": "https://tanklessgeek.net/products/gasland-ce528lp",
      "sourceUrl": "https://gaslandchef.com/products/indoor-water-heater-lgp",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-09-06",
      "fuel": "Propane",
      "input": "150,000 BTU/h (propane)",
      "ratedFlow": "5.8 GPM",
      "flowAtTemperatureRise": "5.8 GPM at 35 F rise; 5.3 GPM at 45 F rise; 4 GPM at 60 F rise; 3.4 GPM at 70 F rise",
      "efficiency": "≈0.80 UEF · non-condensing (mfr cites ~96.9% thermal)",
      "serviceRequirements": "Propane (LP) supply and regulator for 150,000 BTU/h.; Approved indoor venting (non-condensing) per the manual.; Freeze protection activates at 41 °F — needs power/battery as specified.; A 24.69 × 14.25 in wall unit (~38.6 lb).",
      "warranty": "1-yr free replacement",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "FOGATTI Electric 14kW",
      "brand": "FOGATTI",
      "reviewUrl": "https://tanklessgeek.net/products/fogatti-electric-14kw",
      "sourceUrl": "https://www.amazon.com/Electric-Tankless-FOGATTI-14kW-Self-Adjustment/dp/B0G25DWC3W",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-09-06",
      "fuel": "Electric",
      "input": "14 kW @ 240 V (~59 A draw)",
      "ratedFlow": "3.3 GPM",
      "flowAtTemperatureRise": "2.7 GPM at 35 F rise; 2.1 GPM at 45 F rise; 1.6 GPM at 60 F rise; 1.4 GPM at 70 F rise",
      "efficiency": "98% (electric resistance)",
      "serviceRequirements": "One 60 A breaker with 6-gauge wire (~59 A draw).; Panel headroom for the circuit.; ½\" water connections; a compact 14.3 × 9.6 in wall unit; ETL certified.",
      "warranty": "3 yrs",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Camplux 5L Portable",
      "brand": "Camplux",
      "reviewUrl": "https://tanklessgeek.net/products/camplux-5l-portable",
      "sourceUrl": "https://camplux.com/products/camplux-5l-1-32-gpm-outdoor-portable-propane-tankless-water-heater",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-08-23",
      "fuel": "Propane",
      "input": "34,000 BTU/h (propane)",
      "ratedFlow": "1.32 GPM",
      "flowAtTemperatureRise": "1.32 GPM at 35 F rise; 1.2 GPM at 45 F rise; 0.9 GPM at 60 F rise; 0.8 GPM at 70 F rise",
      "efficiency": "≈80% thermal · non-condensing (portable)",
      "serviceRequirements": "Propane tank + regulator/hose; runs on 2 D-cell batteries (no power).; Works from as low as 3.0 PSI — pump- or gravity-fed camp setups are fine.; Outdoor/ventilated use only; folding handle for ~10 lb portability.",
      "warranty": "1 year limited warranty",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Mizudo 4.3",
      "brand": "Mizudo",
      "reviewUrl": "https://tanklessgeek.net/products/mizudo-4-3",
      "sourceUrl": "https://mizudo.com/products/mizudo-100000btu-gas-tankless-water-heater-indoor-white",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-09-06",
      "fuel": "Natural Gas",
      "input": "100,000 BTU/h (natural gas)",
      "ratedFlow": "4.3 GPM",
      "flowAtTemperatureRise": "4.3 GPM at 35 F rise; 3.6 GPM at 45 F rise; 2.7 GPM at 60 F rise; 2.3 GPM at 70 F rise",
      "efficiency": "≈0.81 UEF · non-condensing",
      "serviceRequirements": "Natural-gas supply for 100,000 BTU/h.; 3\" power-vent venting (non-condensing) per the manual.; Indoor wall-mount sized for 2–3 fixtures; CSA certified.",
      "warranty": "1–3 yrs",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "EcoSmart ECO 11",
      "brand": "EcoSmart",
      "reviewUrl": "https://tanklessgeek.net/products/ecosmart-eco-11",
      "sourceUrl": "https://www.ecosmartus.com/product/ecosmart-ECO-11-13-kW-Electric-Tankless-Water-Heater",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-09-06",
      "fuel": "Electric",
      "input": "13 kW @ 240 V",
      "ratedFlow": "2.7 GPM",
      "flowAtTemperatureRise": "2.5 GPM at 35 F rise; 2 GPM at 45 F rise; 1.5 GPM at 60 F rise; 1.3 GPM at 70 F rise",
      "efficiency": "99.8%",
      "serviceRequirements": "One 60 A double-pole breaker with 6-gauge wire.; Panel headroom for ~54 A of continuous draw.; ½\" water connections; a compact 18 × 8 in wall footprint.",
      "warranty": "Limited lifetime (exchanger & electronics, residential — conditions apply)",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Stiebel Eltron Tempra 36 Plus",
      "brand": "Stiebel Eltron",
      "reviewUrl": "https://tanklessgeek.net/products/stiebel-eltron-tempra-36-plus",
      "sourceUrl": "https://pexuniverse.com/stiebel-eltron-tempra-36-plus-whole-house-electric-tankless-water-heater",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-08-23",
      "fuel": "Electric",
      "input": "36 kW @ 240 V (27 kW @ 208 V), self-modulating",
      "ratedFlow": "7.0 GPM",
      "flowAtTemperatureRise": "7 GPM at 35 F rise; 5.5 GPM at 45 F rise; 4.1 GPM at 60 F rise; 3.5 GPM at 70 F rise",
      "efficiency": "99% efficiency",
      "serviceRequirements": "Three 50 A double-pole breakers; ~150 A of dedicated load (300 A service recommended).; Most homes need a service/panel upgrade to add this — verify capacity first.; ¾\" NPT connections; a 16.5 × 14.25 in wall unit.",
      "warranty": "7 years leakage, 3 years parts",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "EcoSmart ECO 18",
      "brand": "EcoSmart",
      "reviewUrl": "https://tanklessgeek.net/products/ecosmart-eco-18",
      "sourceUrl": "https://www.ecosmartus.com/product/ecosmart-ECO-18-18-kW-Electric-Tankless-Water-Heater",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-09-06",
      "fuel": "Electric",
      "input": "18 kW @ 240 V (~75 A draw)",
      "ratedFlow": "3.5 GPM",
      "flowAtTemperatureRise": "3.5 GPM at 35 F rise; 2.7 GPM at 45 F rise; 2 GPM at 60 F rise; 1.8 GPM at 70 F rise",
      "efficiency": "99.8% (electric resistance)",
      "serviceRequirements": "Two double-pole breakers with 8-gauge wire (~75 A total draw).; Panel capacity for the added ~75 A — smaller services may need an upgrade.; ½\" water connections; a 17 × 14 in wall unit.",
      "warranty": "Limited lifetime (exchanger & electronics, residential — conditions apply)",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Eccotemp i12",
      "brand": "Eccotemp",
      "reviewUrl": "https://tanklessgeek.net/products/eccotemp-i12",
      "sourceUrl": "https://www.amazon.com/Eccotemp-i12-LP-water-heater-Black/dp/B0157EJT28",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-09-06",
      "fuel": "Propane",
      "input": "25,000–80,000 BTU/h (propane, modulating)",
      "ratedFlow": "4.0 GPM",
      "flowAtTemperatureRise": "3.6 GPM at 35 F rise; 2.8 GPM at 45 F rise; 2.1 GPM at 60 F rise; 1.8 GPM at 70 F rise",
      "efficiency": "≈79% · non-condensing",
      "serviceRequirements": "Propane (LP) supply/regulator for up to 80,000 BTU/h.; Indoor venting per the manual (non-condensing).; 120 V cord for the fan, touchscreen, and PCB.; Indoor wall-mount with the listed clearances.",
      "warranty": "2 years limited warranty",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Noritz EZ111DV",
      "brand": "Noritz",
      "reviewUrl": "https://tanklessgeek.net/products/noritz-ez111dv",
      "sourceUrl": "https://noritz.com/products/gq-c3261wx-ff-1-us-ez111dv",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-09-06",
      "fuel": "Natural Gas",
      "input": "Up to 199,900 BTU/h (natural gas)",
      "ratedFlow": "11.1 GPM",
      "flowAtTemperatureRise": "11.1 GPM at 35 F rise; 8.7 GPM at 45 F rise; 6.5 GPM at 60 F rise; 5.6 GPM at 70 F rise",
      "efficiency": "0.98 UEF · condensing",
      "serviceRequirements": "Natural-gas line sized for up to 199,900 BTU/h.; 2\" or 3\" PVC venting up to 65 ft, plus a condensate drain (condensing).; 120 V outlet; top water/gas connections ease retrofits; a 27 × 18.5 × 12.8 in unit (~81 lb).; Indoor or outdoor rated.",
      "warranty": "25 years heat exchanger, 5 years parts",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Marey GA10LP",
      "brand": "Marey",
      "reviewUrl": "https://tanklessgeek.net/products/marey-ga10lp",
      "sourceUrl": "https://www.waterheatermanuals.com/marey/ga10lp/",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-09-13",
      "fuel": "Propane",
      "input": "≈79,000 BTU/h (propane)",
      "ratedFlow": "3.1 GPM",
      "flowAtTemperatureRise": "3.1 GPM at 35 F rise; 3.06 GPM at 45 F rise; 2.3 GPM at 60 F rise; 2 GPM at 70 F rise",
      "efficiency": "≈87% thermal · non-condensing (battery ignition, not a pilot)",
      "serviceRequirements": "Propane tank with a regulator; 2 D-cell batteries for ignition — no electricity or standing pilot.; At least ~10 PSI water pressure to operate.; Outdoor/ventilated mounting; summer/winter control knob.",
      "warranty": "5-yr limited",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Rinnai RU180eP",
      "brand": "Rinnai",
      "reviewUrl": "https://tanklessgeek.net/products/rinnai-ru180ep",
      "sourceUrl": "https://www.rinnai.us/residential/product-detail/ru180ep",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-08-23",
      "fuel": "Propane",
      "input": "180,000 BTU/h",
      "ratedFlow": "10.0 GPM",
      "flowAtTemperatureRise": "9.8 GPM at 35 F rise; 7.6 GPM at 45 F rise; 5.7 GPM at 60 F rise; 4.9 GPM at 70 F rise",
      "efficiency": "0.95 UEF",
      "serviceRequirements": "Propane (LP) supply; ¾\" MNPT gas connection for 180,000 BTU/h.; Outdoor mounting — no indoor venting required.; 120 V power; recirculation-capable via an external pump.; An 18.5 × 27.9 × 12.0 in outdoor unit (64 lb).",
      "warranty": "15-yr heat exchanger (or 12,000 hrs) · 5-yr parts · 1-yr labor",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Rinnai RE140iN",
      "brand": "Rinnai",
      "reviewUrl": "https://tanklessgeek.net/products/rinnai-re140in",
      "sourceUrl": "https://www.rinnai.us/residential/product-detail/re140in",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-09-13",
      "fuel": "Natural Gas",
      "input": "140,000 BTU/h",
      "ratedFlow": "5.3 GPM",
      "flowAtTemperatureRise": "5.3 GPM at 35 F rise; 5 GPM at 45 F rise; 3.8 GPM at 60 F rise; 3.2 GPM at 70 F rise",
      "efficiency": "0.81 UEF",
      "serviceRequirements": "Natural-gas line sized for 140,000 BTU/h; ¾\" NPT gas connection (NG supply 4.0–10.5 in w.c.).; 3\"/5\" concentric venting (non-condensing — no condensate drain).; 120 V outlet (71 W run, 4 A max); ¾\" NPT water connections.; A 14.05 × 27.3 × 11.2 in indoor wall-mount (38.5 lb); approved to 10,200 ft.",
      "warranty": "15-yr heat exchanger (or 12,000 hrs) · 5-yr parts · 1-yr labor",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Rinnai V65iN",
      "brand": "Rinnai",
      "reviewUrl": "https://tanklessgeek.net/products/rinnai-v65in",
      "sourceUrl": "https://www.rinnai.us/residential/product-detail/v65in",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-08-23",
      "fuel": "Natural Gas",
      "input": "150,000 BTU/h",
      "ratedFlow": "6.5 GPM",
      "flowAtTemperatureRise": "6.5 GPM at 35 F rise; 5.3 GPM at 45 F rise; 4 GPM at 60 F rise; 3.4 GPM at 70 F rise",
      "efficiency": "0.80 UEF · non-condensing",
      "serviceRequirements": "Natural-gas line sized for 150,000 BTU/h; ¾\" NPT gas connection.; Category III stainless venting (non-condensing — no condensate).; 120 V power; approved for high-elevation installs.; A 14.0 × 26.9 × 9.3 in indoor wall-mount (45.6 lb).",
      "warranty": "10-yr heat exchanger · 5-yr parts · 1-yr labor",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Rheem IKONIC S84iN",
      "brand": "Rheem",
      "reviewUrl": "https://tanklessgeek.net/products/rheem-ikonic-s84in",
      "sourceUrl": "https://www.rheem.com/innovation-tankless-ikonic/",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-08-23",
      "fuel": "Natural Gas",
      "input": "157,000 BTU/h",
      "ratedFlow": "8.4 GPM",
      "flowAtTemperatureRise": "8.4 GPM at 35 F rise; 6.6 GPM at 45 F rise; 4.9 GPM at 60 F rise; 4.2 GPM at 70 F rise",
      "efficiency": "0.94 UEF",
      "serviceRequirements": "Natural-gas line sized for 157,000 BTU/h.; PVC/CPVC venting and a condensate drain (condensing).; 120 V outlet; built-in EcoNet Wi-Fi; LeakGuard auto shut-off.; A 17.3 × 28.6 × 13.7 in indoor wall-mount.",
      "warranty": "12-yr heat exchanger (15-yr with registration) · 5-yr parts · 1-yr labor",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Rheem RTEX-24",
      "brand": "Rheem",
      "reviewUrl": "https://tanklessgeek.net/products/rheem-rtex-24",
      "sourceUrl": "https://www.rheem.com/product/rheem-professional-classic-series-tankless-electric-rtex-24-kw-rtex-24/",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-08-23",
      "fuel": "Electric",
      "input": "24 kW · 240 V",
      "ratedFlow": "5.9 GPM",
      "flowAtTemperatureRise": "4.7 GPM at 35 F rise; 3.6 GPM at 45 F rise; 2.7 GPM at 60 F rise; 2.3 GPM at 70 F rise",
      "efficiency": "99.8%",
      "serviceRequirements": "Three 40 A double-pole breakers with three 8-gauge runs (~120 A).; Panel capacity for the load — many homes need a subpanel or upgrade.; ½\" connections; a compact 17.6 × 18.25 in wall unit (18 lb).",
      "warranty": "5-yr heating chamber · 1-yr parts",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "EcoSmart ECO 36",
      "brand": "EcoSmart",
      "reviewUrl": "https://tanklessgeek.net/products/ecosmart-eco-36",
      "sourceUrl": "https://www.ecosmartus.com/product/ecosmart-ECO-36-36-kW-Electric-Tankless-Water-Heater",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-08-23",
      "fuel": "Electric",
      "input": "36 kW @ 240 V (~150 A draw)",
      "ratedFlow": "6.0 GPM",
      "flowAtTemperatureRise": "7 GPM at 35 F rise; 5.5 GPM at 45 F rise; 4.1 GPM at 60 F rise; 3.5 GPM at 70 F rise",
      "efficiency": "99.8% (electric resistance)",
      "serviceRequirements": "Four double-pole breakers with four separate 8-gauge runs (~150 A draw).; A 200 A service is realistically the minimum; many homes need a subpanel or service upgrade.; Whole-home electric sizing — verify winter inlet temperatures before relying on rated GPM.",
      "warranty": "Limited lifetime (exchanger & electronics, residential — conditions apply)",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Rheem RTG-70XLN-3",
      "brand": "Rheem",
      "reviewUrl": "https://tanklessgeek.net/products/rheem-rtg-70xln-3",
      "sourceUrl": "https://www.rheem.com/product/rheem-rtg-series-high-efficiency-non-condensing-outdoor-tankless-gas-water-heater-rtg-70xln-3/",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-09-13",
      "fuel": "Natural Gas",
      "input": "160,000 BTU/h",
      "ratedFlow": "7.0 GPM",
      "flowAtTemperatureRise": "7 GPM at 35 F rise; 5.8 GPM at 45 F rise; 4.4 GPM at 60 F rise; 3.7 GPM at 70 F rise",
      "efficiency": "0.82 UEF · non-condensing",
      "serviceRequirements": "Natural-gas line sized for 160,000 BTU/h.; Outdoor mounting — no indoor venting needed.; Continuous power required for the built-in freeze protection.; A 13.9 × 25.6 × 10.2 in wall unit (~46.5 lb).",
      "warranty": "12-yr heat exchanger (15-yr with registration) · 5-yr parts · 1-yr labor",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Fogatti 7.5 GPM",
      "brand": "Fogatti",
      "reviewUrl": "https://tanklessgeek.net/products/fogatti-7-5-gpm",
      "sourceUrl": "https://www.amazon.com/Propane-Tankless-Heater-Demand-Persons/dp/B089LRJB8H",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-08-23",
      "fuel": "Propane",
      "input": "170,000 BTU/h (propane)",
      "ratedFlow": "7.5 GPM",
      "flowAtTemperatureRise": "7.5 GPM at 35 F rise; 6.1 GPM at 45 F rise; 4.6 GPM at 60 F rise; 3.9 GPM at 70 F rise",
      "efficiency": "≈0.81 UEF · non-condensing",
      "serviceRequirements": "Propane (LP) supply with a ¾\" NPT gas connection for 170,000 BTU/h.; 3\" power-vent venting (non-condensing) per the manual.; ¾\" NPT water connections; servo-controlled temperature.",
      "warranty": "5-yr heat exchanger · 2-yr parts",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "A.O. Smith ATI-540H-N",
      "brand": "A.O. Smith",
      "reviewUrl": "https://tanklessgeek.net/products/ao-smith-ati-540h-n",
      "sourceUrl": "https://www.hotwater.com/products/tankless-high-efficiency-condensing-proline-xe/ati-540h-100/100123378.html",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-08-23",
      "fuel": "Natural Gas",
      "input": "199,000 BTU/h (natural gas)",
      "ratedFlow": "Up to 10 GPM",
      "flowAtTemperatureRise": "10 GPM at 35 F rise; 8.2 GPM at 45 F rise; 6.2 GPM at 60 F rise; 5.3 GPM at 70 F rise",
      "efficiency": "≈0.93 UEF · condensing",
      "serviceRequirements": "Natural-gas line sized for 199,000 BTU/h — a ½\" branch is usually too small; most installs need ¾\" or an upsized run confirmed by the installer.; PVC/CPVC intake & exhaust venting (condensing) plus a condensate drain to a nearby drain or pump.; 120 V outlet within reach of the unit for the controls and combustion fan.; Indoor wall-mount location with the clearances in the manual; recirculation-capable if you add a pump.",
      "warranty": "15-yr heat exchanger (residential) · 5-yr parts · 1-yr labor",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "FOGATTI Instagas 170 LP",
      "brand": "FOGATTI",
      "reviewUrl": "https://tanklessgeek.net/products/fogatti-instagas-170-lp",
      "sourceUrl": "https://www.homedepot.com/p/FOGATTI-InstaGas-Classic-Propane-Gas-Tankless-Water-Heater-170-000-BTU-Max-7-5-GPM-120V-AC-Indoor-CSA-Certified-White-FDG-CF170W-LP/327896918",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-09-06",
      "fuel": "Propane",
      "input": "170,000 BTU/h (propane)",
      "ratedFlow": "7.5 GPM",
      "flowAtTemperatureRise": "7.5 GPM at 35 F rise; 6.1 GPM at 45 F rise; 4.6 GPM at 60 F rise; 3.9 GPM at 70 F rise",
      "efficiency": "≈0.81 UEF · non-condensing",
      "serviceRequirements": "Propane (LP) supply with a ¾\" NPT gas connection for 170,000 BTU/h.; 3\" power-vent venting (non-condensing).; A standard 120 V outlet for the controls and fan.; ¾\" NPT water connections; CSA certified for indoor use.",
      "warranty": "5-yr heat exchanger · 2-yr parts",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Bosch Therm 940 ES",
      "brand": "Bosch",
      "reviewUrl": "https://tanklessgeek.net/products/bosch-therm-940-es",
      "sourceUrl": "https://www.manualslib.com/manual/1650991/Bosch-940-Es.html",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-08-23",
      "fuel": "Natural Gas",
      "input": "199,000 BTU/h (natural gas)",
      "ratedFlow": "9.4 GPM",
      "flowAtTemperatureRise": "9.4 GPM at 35 F rise; 7.3 GPM at 45 F rise; 5.4 GPM at 60 F rise; 4.7 GPM at 70 F rise",
      "efficiency": "≈83% thermal · non-condensing · ENERGY STAR",
      "serviceRequirements": "Natural-gas line sized for 199,000 BTU/h (typically ¾\").; 3–4\" stainless Category III venting, side-wall or roof (non-condensing — no condensate).; Sealed combustion with an external filter; a 30.5 × 17.75 × 11.25 in wall footprint (~67 lb).; Indoor mounting with the manual's clearances and freeze protection.",
      "warranty": "15-yr heat exchanger · 5-yr parts (residential)",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Gasland BE158",
      "brand": "Gasland",
      "reviewUrl": "https://tanklessgeek.net/products/gasland-be158",
      "sourceUrl": "https://gaslandchef.com/products/6l-water-heater-be158",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-08-23",
      "fuel": "Propane",
      "input": "41,000 BTU/h (propane)",
      "ratedFlow": "1.58 GPM",
      "flowAtTemperatureRise": "1.58 GPM at 35 F rise; 1.46 GPM at 45 F rise; 1.09 GPM at 60 F rise; 0.94 GPM at 70 F rise",
      "efficiency": "≈80% thermal · non-condensing (portable)",
      "serviceRequirements": "Propane tank with the included CSA regulator/hose; 2 D-cell batteries for ignition.; Works from as low as 3.6 PSI; a shower head and adapter are included.; Outdoor/ventilated use only; ~15 lb with a carry handle.",
      "warranty": "1 year limited warranty",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Eccotemp 45HI",
      "brand": "Eccotemp",
      "reviewUrl": "https://tanklessgeek.net/products/eccotemp-45hi",
      "sourceUrl": "https://www.fergusonhome.com/eccotemp-45hi-ng/s1136108",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-09-06",
      "fuel": "Propane",
      "input": "19,000–150,000 BTU/h (propane, modulating)",
      "ratedFlow": "6.8 GPM",
      "flowAtTemperatureRise": "6.8 GPM at 35 F rise; 5.3 GPM at 45 F rise; 4 GPM at 60 F rise; 3.4 GPM at 70 F rise",
      "efficiency": "≈0.80 UEF · non-condensing",
      "serviceRequirements": "Propane (LP) supply and regulator for up to 150,000 BTU/h.; An approved venting kit for indoor use (non-condensing) — check the manual's pipe and termination specs.; 120 V outlet for the exhaust fan and controls.; Rated to 2,000 ft elevation — confirm before high-altitude installs.",
      "warranty": "10-yr heat exchanger · 5-yr parts",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Takagi T-H3-DV-N",
      "brand": "Takagi",
      "reviewUrl": "https://tanklessgeek.net/products/takagi-t-h3-dv-n",
      "sourceUrl": "https://www.takagi.com/products/tankless-water-heaters/t-h3-dv-n",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-08-23",
      "fuel": "Natural Gas",
      "input": "15,000–199,000 BTU/h (natural gas)",
      "ratedFlow": "10.0 GPM",
      "flowAtTemperatureRise": "10 GPM at 35 F rise; 8.4 GPM at 45 F rise; 6.3 GPM at 60 F rise; 5.4 GPM at 70 F rise",
      "efficiency": "0.95 UEF",
      "serviceRequirements": "Natural-gas line sized for up to 199,000 BTU/h.; Condensing venting (PVC/CPVC) plus a condensate drain per the manual.; 120 V power; can multi-link to 4 units; certified to 10,100 ft.",
      "warranty": "15 years heat exchanger, 5 years parts",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Ranein 18kW Electric",
      "brand": "Ranein",
      "reviewUrl": "https://tanklessgeek.net/products/ranein-18kw-electric",
      "sourceUrl": "https://manuals.plus/asin/B0FKB36VMJ",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-09-13",
      "fuel": "Electric",
      "input": "18 kW @ 240 V, self-modulating",
      "ratedFlow": "Up to 4.3 GPM (manufacturer rating at low temperature rise)",
      "flowAtTemperatureRise": "3.5 GPM at 35 F rise; 2.7 GPM at 45 F rise; 2 GPM at 60 F rise; 1.8 GPM at 70 F rise",
      "efficiency": "≈99% (electric resistance)",
      "serviceRequirements": "Two 40 A double-pole breakers with 8-gauge wire (~75 A total).; Panel headroom for the added load.; ¾\" NPT connections; a 13.8 × 3.1 × 18.7 in wall unit; IPX4, CSA certified.",
      "warranty": "3 yrs",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Atmor ThermoPro 24kW",
      "brand": "Atmor",
      "reviewUrl": "https://tanklessgeek.net/products/atmor-thermopro-24kw",
      "sourceUrl": "https://www.homedepot.com/p/ATMOR-ThermoPro-24-kW-240-Volt-4-6-GPM-Stainless-Steel-Electric-Tankless-Water-Heater-with-Self-Modulating-Technology-in-White-AT-TBDT-24CO/304505650",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-09-13",
      "fuel": "Electric",
      "input": "24 kW @ 240 V, self-modulating",
      "ratedFlow": "Up to 4.6 GPM (warm climate)",
      "flowAtTemperatureRise": "4.6 GPM at 35 F rise; 3.6 GPM at 45 F rise; 2.7 GPM at 60 F rise; 2.3 GPM at 70 F rise",
      "efficiency": "99% efficiency",
      "serviceRequirements": "Three 40 A double-pole breakers with three separate 8-gauge runs (≈120 A of dedicated capacity).; Enough spare panel capacity for that load — many 100–150 A homes need a subpanel or service upgrade.; ½\" water connections; a pressure-relief device is included.; Indoor wall location near the panel to keep the heavy runs short.",
      "warranty": "7-yr leakage / 2-yr parts",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Navien NPE-240S",
      "brand": "Navien",
      "reviewUrl": "https://tanklessgeek.net/products/navien-npe-240s",
      "sourceUrl": "https://www.navieninc.com/products/npe-240s2",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-08-23",
      "fuel": "Natural Gas",
      "input": "13,300–199,900 BTU/h (NG/LP convertible)",
      "ratedFlow": "11.2 GPM",
      "flowAtTemperatureRise": "11.2 GPM at 35 F rise; 8.5 GPM at 45 F rise; 6.4 GPM at 60 F rise; 5.5 GPM at 70 F rise",
      "efficiency": "0.96 UEF · condensing",
      "serviceRequirements": "Natural-gas line sized for up to 199,900 BTU/h (often ¾\", confirm sizing).; PVC intake/exhaust venting and a condensate drain (condensing).; 120 V outlet; a 27.4 × 17.3 × 13.2 in unit (~73 lb), indoor or outdoor rated.; NG/LP convertible — confirm the correct gas type at install.",
      "warranty": "15 years heat exchanger, 5 years parts",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Noritz NR66-OD",
      "brand": "Noritz",
      "reviewUrl": "https://tanklessgeek.net/products/noritz-nr66-od",
      "sourceUrl": "https://www.plumbersstock.com/noritz-nr66-od-ng.html",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-09-06",
      "fuel": "Natural Gas",
      "input": "Up to 140,000 BTU/h (natural gas)",
      "ratedFlow": "6.6 GPM",
      "flowAtTemperatureRise": "6.6 GPM at 35 F rise; 5.2 GPM at 45 F rise; 3.9 GPM at 60 F rise; 3.3 GPM at 70 F rise",
      "efficiency": "≈0.83 EF · non-condensing",
      "serviceRequirements": "Natural-gas supply for up to 140,000 BTU/h.; Outdoor, weatherproof mounting — no indoor venting or condensate drain.; Direct electronic ignition needs power; freeze/lightning protection is built in.",
      "warranty": "12 years heat exchanger, 5 years parts",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Rinnai RU160iN",
      "brand": "Rinnai",
      "reviewUrl": "https://tanklessgeek.net/products/rinnai-ru160in",
      "sourceUrl": "https://www.rinnai.us/residential/product-detail/ru160in",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-08-23",
      "fuel": "Natural Gas",
      "input": "160,000 BTU/h",
      "ratedFlow": "9.0 GPM",
      "flowAtTemperatureRise": "8.4 GPM at 35 F rise; 6.5 GPM at 45 F rise; 4.9 GPM at 60 F rise; 4.2 GPM at 70 F rise",
      "efficiency": "0.92 UEF · condensing (ENERGY STAR)",
      "serviceRequirements": "Natural-gas line sized for 160,000 BTU/h; ¾\" MNPT gas connection.; PVC/CPVC/polypropylene venting plus a ½\" condensate drain (condensing).; 120 V power; recirculation-capable (external pump / RXP).; An 18.5 × 31.3 × 11.45 in indoor wall-mount (62 lb).",
      "warranty": "15-yr heat exchanger (or 12,000 hrs) · 5-yr parts · 1-yr labor",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Rinnai V53DeN",
      "brand": "Rinnai",
      "reviewUrl": "https://tanklessgeek.net/products/rinnai-v53den",
      "sourceUrl": "https://www.rinnai.us/residential/product-detail/v53den",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-08-23",
      "fuel": "Natural Gas",
      "input": "120,000 BTU/h",
      "ratedFlow": "5.3 GPM",
      "flowAtTemperatureRise": "5.3 GPM at 35 F rise; 4.3 GPM at 45 F rise; 3.2 GPM at 60 F rise; 2.8 GPM at 70 F rise",
      "efficiency": "0.81 UEF · non-condensing",
      "serviceRequirements": "Natural-gas supply for 120,000 BTU/h; ¾\" NPT gas connection.; Outdoor mounting — no indoor venting or condensate.; 120 V power for controls and freeze protection.; A 14.0 × 21.8 × 7.9 in compact outdoor unit (29.7 lb).",
      "warranty": "10-yr heat exchanger · 5-yr parts · 1-yr labor",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Rinnai V53DeP",
      "brand": "Rinnai",
      "reviewUrl": "https://tanklessgeek.net/products/rinnai-v53dep",
      "sourceUrl": "https://www.rinnai.us/residential/product-detail/v53dep",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-08-23",
      "fuel": "Propane",
      "input": "120,000 BTU/h",
      "ratedFlow": "5.3 GPM",
      "flowAtTemperatureRise": "5.3 GPM at 35 F rise; 4.4 GPM at 45 F rise; 3.3 GPM at 60 F rise; 2.8 GPM at 70 F rise",
      "efficiency": "0.82 UEF",
      "serviceRequirements": "Propane (LP) supply and regulator for 120,000 BTU/h; ¾\" NPT gas connection.; Outdoor mounting — no indoor venting or condensate.; 120 V power for controls and freeze protection.; A 14.0 × 21.8 × 7.9 in outdoor unit (29.7 lb).",
      "warranty": "10-yr heat exchanger · 5-yr parts · 1-yr labor",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Rheem RTG-70DVLN-3",
      "brand": "Rheem",
      "reviewUrl": "https://tanklessgeek.net/products/rheem-rtg-70dvln-3",
      "sourceUrl": "https://www.rheem.com/product/rheem-rtg-series-high-efficiency-non-condensing-indoor-tankless-gas-water-heaters-rtg-70dvln-3/",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-08-23",
      "fuel": "Natural Gas",
      "input": "160,000 BTU/h",
      "ratedFlow": "7.0 GPM",
      "flowAtTemperatureRise": "7 GPM at 35 F rise; 5.8 GPM at 45 F rise; 4.4 GPM at 60 F rise; 3.7 GPM at 70 F rise",
      "efficiency": "0.82 UEF · non-condensing",
      "serviceRequirements": "Natural-gas line sized for 160,000 BTU/h.; Category III stainless or concentric direct-vent (non-condensing — no condensate).; 120 V power for controls; Hot Start reduces cold-water bursts.; A 13.9 × 25.6 × 10.2 in indoor wall-mount (~46.5 lb).",
      "warranty": "12-yr heat exchanger (15-yr with registration) · 5-yr parts · 1-yr labor",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "A.O. Smith Signature 6.6 GPM",
      "brand": "A.O. Smith",
      "reviewUrl": "https://tanklessgeek.net/products/ao-smith-signature-66-gpm",
      "sourceUrl": "https://www.consumeraffairs.com/homeowners/ao-smith-water-heater-warranty.html",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-08-23",
      "fuel": "Natural Gas",
      "input": "160,000 BTU/h (natural gas)",
      "ratedFlow": "6.6 GPM",
      "flowAtTemperatureRise": "6.6 GPM at 35 F rise; 6.6 GPM at 45 F rise; 5 GPM at 60 F rise; 4.3 GPM at 70 F rise",
      "efficiency": "≈0.94 UEF · condensing · ENERGY STAR",
      "serviceRequirements": "Natural-gas supply sized for 160,000 BTU/h (commonly a ¾\" gas line).; PVC intake/exhaust venting and a condensate drain (condensing unit).; 120 V outlet for the controls and combustion fan.; Indoor wall-mount with the manufacturer's clearances.",
      "warranty": "15-yr heat exchanger · 5-yr parts · 1-yr labor",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Bosch Therm 830 ES",
      "brand": "Bosch",
      "reviewUrl": "https://tanklessgeek.net/products/bosch-therm-830-es",
      "sourceUrl": "https://pexuniverse.com/uploads/docs/pdf/bb-830-es-submittal-sheet.pdf",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-08-23",
      "fuel": "Propane",
      "input": "175,000 BTU/h (propane)",
      "ratedFlow": "8.3 GPM",
      "flowAtTemperatureRise": "8.3 GPM at 35 F rise; 6.4 GPM at 45 F rise; 4.8 GPM at 60 F rise; 4.1 GPM at 70 F rise",
      "efficiency": "≈82% thermal · non-condensing · ENERGY STAR",
      "serviceRequirements": "Propane (LP) supply and regulator sized for 175,000 BTU/h.; 3–4\" stainless Category III venting, side-wall or roof (non-condensing — no condensate drain).; Sealed-combustion air per the manual; an external inlet filter is included.; Indoor wall-mount with freeze protection where temperatures drop.",
      "warranty": "15-yr heat exchanger · 5-yr parts (residential)",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Camplux 16L Outdoor",
      "brand": "Camplux",
      "reviewUrl": "https://tanklessgeek.net/products/camplux-16l-outdoor",
      "sourceUrl": "https://camplux.com/products/camplux-16l-gas-tankless-water-heater",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-08-23",
      "fuel": "Propane",
      "input": "110,000 BTU/h (propane)",
      "ratedFlow": "4.22 GPM",
      "flowAtTemperatureRise": "4.22 GPM at 35 F rise; 3.9 GPM at 45 F rise; 2.9 GPM at 60 F rise; 2.5 GPM at 70 F rise",
      "efficiency": "≈80–84% thermal · non-condensing (portable)",
      "serviceRequirements": "Propane tank with a CSA regulator/hose (a 20 lb tank is typical for portable use).; 2 D-cell batteries for ignition — no electrical hookup needed.; Outdoor or very well-ventilated use only; never operate inside a living space.; A 4–110 PSI water source (garden hose or pump-fed).",
      "warranty": "2 years limited warranty",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Takagi T-KJr2-IN-NG",
      "brand": "Takagi",
      "reviewUrl": "https://tanklessgeek.net/products/takagi-t-kjr2-in-ng",
      "sourceUrl": "https://www.supplyhouse.com/Takagi-T-KJR2-IN-NG-T-KJr2-IN-Takagi-Tankless-Indoor-Water-Heater-Natural-Gas",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-08-23",
      "fuel": "Natural Gas",
      "input": "Up to 140,000 BTU/h (natural gas)",
      "ratedFlow": "6.6 GPM",
      "flowAtTemperatureRise": "6.5 GPM at 35 F rise; 5 GPM at 45 F rise; 3.8 GPM at 60 F rise; 3.2 GPM at 70 F rise",
      "efficiency": "0.81 UEF · non-condensing",
      "serviceRequirements": "Natural-gas line sized for up to 140,000 BTU/h.; 4\" stainless direct-vent (sidewall or roof; non-condensing — no condensate).; 120 V power; indoor wall-mount.",
      "warranty": "10 years heat exchanger, 5 years parts",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Fogatti 18 kW",
      "brand": "Fogatti",
      "reviewUrl": "https://tanklessgeek.net/products/fogatti-18-kw",
      "sourceUrl": "https://watercomfortdepot.com/products/fogatti-18kw-240volts-electric-tankless-water-heater-gray",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-09-06",
      "fuel": "Electric",
      "input": "18 kW @ 240 V (~75 A draw)",
      "ratedFlow": "4.4 GPM",
      "flowAtTemperatureRise": "3.5 GPM at 35 F rise; 2.7 GPM at 45 F rise; 2 GPM at 60 F rise; 1.8 GPM at 70 F rise",
      "efficiency": "98% efficiency",
      "serviceRequirements": "Two 40 A double-pole breakers with 8-gauge wire (~75 A draw).; Panel capacity for the added load.; ½\" water connections; a 17.1 × 12.9 in wall footprint; ETL certified.",
      "warranty": "5 years heat exchanger, 2 years parts",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Ranein 4.3",
      "brand": "Ranein",
      "reviewUrl": "https://tanklessgeek.net/products/ranein-4-3",
      "sourceUrl": "https://www.lwswater.com/ranein-natural-gas-tankless-water-heater-with-vent-pipe-indoor-max-43/",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-09-13",
      "fuel": "Natural Gas",
      "input": "100,000 BTU/h (natural gas)",
      "ratedFlow": "4.3 GPM",
      "flowAtTemperatureRise": "4.3 GPM at 35 F rise; 3.5 GPM at 45 F rise; 2.6 GPM at 60 F rise; 2.3 GPM at 70 F rise",
      "efficiency": "≈0.79 EF · non-condensing",
      "serviceRequirements": "Natural-gas supply for 100,000 BTU/h.; Approved indoor venting (non-condensing) per the manual.; Anti-freeze protection to 14 °F; indoor wall-mount.",
      "warranty": "1–5 yrs",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Stiebel Tempra 29 Plus",
      "brand": "Stiebel Eltron",
      "reviewUrl": "https://tanklessgeek.net/products/stiebel-tempra-29-plus",
      "sourceUrl": "https://www.stiebel-eltron-usa.com/sites/default/files/pdf/tech-specs-tempra.pdf",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-09-13",
      "fuel": "Electric",
      "input": "28.8 kW @ 240 V (21.6 kW @ 208 V), self-modulating",
      "ratedFlow": "Up to ~5.6 GPM (mfr rating at a mild rise)",
      "flowAtTemperatureRise": "5.6 GPM at 35 F rise; 4.4 GPM at 45 F rise; 3.3 GPM at 60 F rise; 2.8 GPM at 70 F rise",
      "efficiency": "99%",
      "serviceRequirements": "Three 40 A double-pole breakers; ~120 A of dedicated load (200 A service recommended).; Confirm panel capacity — many homes need an upgrade to add this.; ¾\" NPT connections; a 19 lb wall unit; zero standby loss.",
      "warranty": "7 yrs leakage, 3 yrs parts",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Rheem RTGH-84DVLN",
      "brand": "Rheem",
      "reviewUrl": "https://tanklessgeek.net/products/rheem-rtgh-84dvln",
      "sourceUrl": "https://media.rheem.com/blobazrheem/wp-content/uploads/sites/36/2024/04/RTGH-Series-Rev1-condensing-Tankless-SS_1024-.pdf",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-09-13",
      "fuel": "Natural Gas",
      "input": "157,000 BTU/h",
      "ratedFlow": "8.4 GPM",
      "flowAtTemperatureRise": "8.3 GPM at 35 F rise; 6.5 GPM at 45 F rise; 4.9 GPM at 60 F rise; 4.2 GPM at 70 F rise",
      "efficiency": "0.93 UEF",
      "serviceRequirements": "Natural-gas line sized for 157,000 BTU/h.; PVC/CPVC venting (up to 60 ft at 2\", 150 ft at 3\") plus a condensate drain.; 120 V power; EcoNet-capable; LeakGuard on Wi-Fi models.; An 18 × 23 × 9 in indoor wall-mount (~75 lb).",
      "warranty": "12-yr heat exchanger (15-yr with registration) · 5-yr parts · 1-yr labor",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    },
    {
      "model": "Marey 24L",
      "brand": "Marey",
      "reviewUrl": "https://tanklessgeek.net/products/marey-24l",
      "sourceUrl": "https://www.walmart.com/ip/Marey-Tankless-Water-Heater-Gas-7-5-GPM-170-000-BTU-Liquid-Propane-CSA-Certified-Indoor/232972482",
      "sourceDocumentDate": "Not stated in the source record",
      "dateVerified": "2026-09-13",
      "fuel": "Natural Gas",
      "input": "170,000 BTU/h (natural gas)",
      "ratedFlow": "7.5 GPM",
      "flowAtTemperatureRise": "7.5 GPM at 35 F rise; 6.2 GPM at 45 F rise; 4.6 GPM at 60 F rise; 4 GPM at 70 F rise",
      "efficiency": "≈0.82 EF · non-condensing",
      "serviceRequirements": "Natural-gas supply sized for 170,000 BTU/h.; Approved indoor venting (non-condensing) per the manual.; Indoor wall-mount; rated to 2,000 ft elevation.",
      "warranty": "5-yr limited (parts, not labor)",
      "methodologyUrl": "https://tanklessgeek.net/how-we-review"
    }
  ]
}