Compare our complete selection of source-linked tankless water heater reviews. Use the filters to narrow models for your home.
This is the full catalog of tankless water heaters we have reviewed, covering gas, propane and electric models from point-of-use units to whole-home condensing systems. Every listing opens a detailed review with verified specifications, an editorial score, owner-feedback themes and links to the manufacturer documents each fact is drawn from.
We label two kinds of rating separately: our own editorial score, based on published specifications, warranty terms and installation requirements, and the Amazon customer rating, which reflects buyer feedback. We do not claim laboratory testing, and a maximum flow rate is only meaningful alongside the temperature rise it was measured at, so confirm the performance chart for your climate and required output.
Use the filters and sort controls above to narrow models by fuel type, flow rate, price range, brand, efficiency and warranty. If you are unsure where to start, the sizing calculator estimates the flow and temperature rise your household needs, and the buying guide explains how to compare units for your home.
Showing 43 of 43 products
Compact electric tankless designed for basic residential hot water needs. This budget-friendly unit offers essential features and safety protections for small homes and point-of-use applications.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Affordable indoor propane tankless heater delivering up to 5.8 GPM for medium demand.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Indoor, non-condensing natural-gas tankless from Rinnai's Value series — 150,000 BTU/h and 6.5 GPM at 0.80 UEF. A long-proven, budget-friendly indoor gas unit for small-to-medium homes, high-altitude approved.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
24 kW, 240 V whole-home electric tankless with self-modulating output and ±1 °F digital control (80–140 °F). Rated up to 5.9 GPM at minimal rise; a strong-value electric unit for warm climates or homes without gas — needs ~120 A of panel capacity.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
High-performance condensing tankless built to commercial standards for residential applications. This Takagi unit delivers exceptional efficiency and capacity with professional-grade reliability.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
High-power electric tankless engineered for maximum demand applications. This top-tier Tempra model features three heating modules and advanced flow control for optimal performance in challenging conditions.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Outdoor condensing propane tankless from Rinnai's SENSEI line — 180,000 BTU/h and up to 10.0 GPM at ~0.95 UEF. High-flow whole-home hot water for propane households, with no indoor venting required and a 15-year heat-exchanger warranty.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Compact indoor non-condensing natural-gas tankless heater rated at 140,000 BTU/h and 5.3 GPM max — a value-priced entry into Rinnai's ecosystem for small-to-medium homes, backed by a 15-year heat-exchanger warranty.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Rheem's flagship IKONIC condensing natural-gas tankless — 157,000 BTU/h and 8.4 GPM at ~0.94 UEF, with built-in EcoNet Wi-Fi and LeakGuard automatic-shutoff leak protection. The smartest, best-protected tankless Rheem makes (non-recirculating; see SR84iN for a pump).
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Outdoor, non-condensing natural-gas tankless from Rheem's mid-efficiency RTG line — 160,000 BTU/h and 7.0 GPM at 0.82 UEF, with Hot Start Programming. Exterior mounting means no indoor venting; ideal for warm-to-mild climates.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Indoor condensing natural-gas tankless from Rinnai's SENSEI Super High Efficiency Plus line — 160,000 BTU/h and up to 9.0 GPM at ~0.92 UEF, a whole-home condensing unit for 3–4 bath homes with a 15-year heat-exchanger warranty.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Outdoor, non-condensing natural-gas tankless from Rinnai's Value series — 120,000 BTU/h and 5.3 GPM at 0.81 UEF. The most affordable way into Rinnai for a small warm-climate home, with exterior mounting that removes indoor venting.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Outdoor, non-condensing propane tankless from Rinnai's Value series — 120,000 BTU/h and 5.3 GPM at ~0.82 UEF. A low-cost endless-hot-water option for small or seasonal propane homes, mounted outdoors with no indoor venting.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Compact budget indoor natural gas tankless heater with 4.3 GPM capacity and vent kit.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
High-end indoor electric unit with Advanced Flow Control and a digital interface, best suited to whole-home use in warm or moderate climates. Cold-climate capacity depends on inlet-water temperature and simultaneous demand.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Budget indoor natural-gas tankless (100,000 BTU/h, up to 4.3 GPM, ≈0.81 UEF) with an oxygen-free copper heat exchanger, a touch panel with LED display, 3-inch power venting, and CSA certification — sized for 2–3 fixtures in a small home or apartment.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Compact indoor electric tankless unit ideal for point-of-use or small homes.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Mid-sized electric tankless designed for moderate residential applications. This cost-effective unit provides reliable performance for small homes and condos with reasonable hot water demands.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
High-output condensing natural-gas tankless (A.O. Smith ProLine XE) delivering 199,000 BTU/h and up to 10 GPM at roughly 0.93 UEF, with a copper heat exchanger, Ultra-Low NOx emissions, and recirculation capability for heavy-residential and light-commercial use.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Popular portable propane tankless designed for camping and outdoor recreation. This budget-friendly unit provides essential hot water capability with complete accessories for immediate use.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Compact reliable tankless engineered for light-duty residential applications. This Takagi junior model provides proven longevity and dependable performance for apartments and smaller homes.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Indoor condensing natural-gas tankless from Rheem's super-high-efficiency RTGH line — 157,000 BTU/h and 8.4 GPM at up to 0.93 UEF (ENERGY STAR), with Hot Start Programming and lighter PVC/CPVC venting. IKONIC-level performance without the smart-first price.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Ultra-portable propane tankless designed for outdoor recreation and emergency use. This lightweight unit provides instant hot water for camping, outdoor showers, and temporary applications.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
High-capacity condensing tankless by Noritz featuring exceptional flow rates and efficiency. This EZ Series unit is engineered for easy replacement of large tank systems with top water connections.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Lower-priced 18 kW electric tankless model for point-of-use, apartments or small homes. Usable flow depends on inlet-water temperature and simultaneous demand.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Affordable electric tankless featuring digital controls and self-modulating technology. This compact unit provides reliable performance for small to medium homes requiring electric hot water solutions.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Budget-friendly outdoor tankless water heater designed for smaller residential applications. This simple non-condensing unit offers reliable performance with weatherproof casing for exterior installation.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Premium condensing gas tankless from A.O. Smith featuring advanced efficiency and reliable performance. This high-efficiency unit delivers excellent capacity with condensing technology for reduced operating costs.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
27 kW, 240-volt residential electric tankless for whole-home hot water in warm-to-moderate climates. Compact and digitally controlled, with ≈99.8% efficiency, low 0.25 GPM activation, and solder-free 1/2-inch flex connections. Requires three 40-amp double-pole circuits.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Compact 14 kW indoor electric tankless heater, ideal for point‑of‑use or small homes.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Stylish compact propane tankless featuring modern design elements. This indoor unit provides reliable single-shower performance with electronic ignition and attractive tempered glass front panel.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Premium condensing tankless from Navien featuring exceptional capacity and efficiency. This NPE-Standard series unit delivers robust performance for large residential applications without built-in recirculation.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
High-flow portable tankless engineered for demanding outdoor applications. This robust unit provides substantial hot water capacity for campsites, barns, and emergency residential backup.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Powerful electric tankless offering maximum capacity from EcoSmart. This high-output unit provides whole-home hot water capability in warm climates with budget-friendly pricing.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
High-capacity non-condensing gas tankless built for maximum durability. This Bosch Therm series unit delivers exceptional flow rates with proven Japanese engineering for long-term reliability.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Basic electric tankless offering essential whole-home capability at budget pricing. This compact unit provides reliable performance for warm climates and point-of-use applications.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Indoor, direct-vent non-condensing natural-gas tankless from Rheem's mid-efficiency RTG line — 160,000 BTU/h and 7.0 GPM at 0.82 UEF, with Hot Start Programming. A value indoor gas unit for small-to-medium homes.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Mid-size propane tankless engineered for reliable residential performance. This Bosch Therm series unit provides dependable hot water delivery with electronic controls and proven non-condensing technology.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Higher-capacity indoor propane tankless from Eccotemp's Builder Series. This non-condensing unit provides reliable whole-home performance at budget-friendly pricing for moderate residential applications.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Non-condensing indoor gas tankless heater by Marey with high flow rate and CSA certification.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
Compact no-electricity point-of-use propane tankless (up to 3.1 GPM, ~79,000 BTU/h) with battery ignition, a copper heat exchanger, and a summer/winter control knob — suited to cabins, tiny homes, and low-pressure or off-grid single-fixture use. Must be vented as a combustion appliance.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
High‑output indoor propane tankless (7.5 GPM) with precise temp control and CSA safety.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.
High-output propane tankless offering robust performance at budget pricing. This modern unit provides reliable indoor installation with comprehensive safety features for moderate residential applications.
Amazon customer rating as of the last specification review. Not the Tankless Geek editorial score.