Marey 24L
Amazon customer rating as of
Tankless Geek editorial score: 4/5
The Marey 24L is a budget indoor natural-gas tankless: 170,000 BTU/h, up to 7.5 GPM, a copper heat exchanger, and an LED touchscreen, aimed at whole-home use for a fraction of a mainstream brand's price. Marey rates it for three to four simultaneous use points in warm climates, with CSA certification and a full safety package (overheat, anti-block, flame-failure, and anti-freeze protection). Two practical limits to note up front: it's certified only to 2,000 feet of elevation, and its 5-year warranty covers parts but not labor.
As a non-condensing unit (~0.82 EF) it's inexpensive and needs no condensate drain, but uses more gas per gallon than a condensing heater and requires proper venting. At 7.5 GPM it genuinely can run multiple fixtures in warm and mild climates, dropping toward one to two in the cold. Its roughly 3.8-star rating tells the familiar budget-tankless story — strong value and fast hot water for many owners, offset by a minority reporting reliability issues and Marey's uneven customer support. For a warm-climate home that wants high flow cheaply and can install it properly, it's a lot of capacity per dollar.
Key Features
Best Use Cases
Our Verdict
A high-flow indoor gas tankless at a budget price, best for warm-climate homes that can vent it properly and stay under 2,000 feet. The 7.5 GPM capacity is real; the caveats are non-condensing efficiency, a parts-only warranty, and Marey's spotty support. Buy it for value, not for pedigree — and have a pro install it.
Technical Specifications
| Input | 170,000 BTU/h (natural gas) |
|---|---|
| Max flow | Up to 7.5 GPM |
| Efficiency | ≈0.82 EF, non-condensing |
| Heat exchanger | Copper |
| Temp range | 95–140 °F; CSA certified |
| Limits | Rated to 2,000 ft; warranty excludes labor |
Specifications verified against the linked source documents. See Sources below.
How much hot water you'll actually get
Usable flow drops as incoming water gets colder. Figures are calculated from rated output (170,000 BTU × 0.82 UEF) and labeled as such — not bench-tested by us.
| Temperature rise | Typical scenario | Usable flow |
|---|---|---|
| 35 °F | Warm climate (75 °F in → 110 °F) — capped at max | 7.5 GPM |
| 45 °F | Mild climate (65 °F in → 110 °F) | 6.2 GPM |
| 60 °F | Cool climate (50 °F in → 110 °F) | 4.6 GPM |
| 70 °F | Cold climate (40 °F in → 110 °F) | 4 GPM |
Usable flow at a 110 °F target: BTU × thermal-eff ÷ (ΔF × 500), capped at the 7.5 GPM maximum (non-condensing ~82%).
Pros
Cons
Buy it if…
- Warm/mild-climate homes wanting 3–4 fixtures on a budget
- Buyers replacing a tank who prioritize price over brand pedigree
- Installs below 2,000 feet elevation with proper venting
- Homeowners comfortable with a parts-only (no-labor) warranty
Skip it if…
- High-altitude homes above 2,000 feet
- Cold climates needing full 7.5 GPM in deep winter
- Buyers who want dependable manufacturer support and labor coverage
Installation Requirements
Professional vs DIY
Gas and venting call for a licensed installer; note the warranty excludes labor, so keep your receipts.
Warranty excludes labor — factor professional install cost into the total.
Gas and electrical work should be done by a licensed professional, and most installs require a permit and must meet local building codes — DIY work can void the manufacturer warranty. Always confirm the unit's own manual for exact clearances, venting, and sizing.
What owners report
Themes summarized from retailer customer feedback (3.8/5 Amazon customer rating, 142 ratings, as of 2026-09-13). These are owner opinions, not our own bench testing.
Owners cite genuine whole-house hot water and fast delivery at a price well below mainstream gas tankless brands.
Satisfaction hinges on proper venting, gas sizing, and staying under the elevation limit — professional installation pays off.
As across Marey's line, some owners report slow or unresponsive customer service and note the warranty excludes labor.
The ~3.8-star rating reflects a minority reporting fault codes or early issues alongside many satisfied buyers.
Marey 24L FAQ
How many fixtures can the Marey 24L run?+
Up to about 7.5 GPM — three to four fixtures in warm climates, tapering to one or two in cold weather as deliverable flow drops.
Can I install it at altitude?+
It's certified only to 2,000 feet. Above that, performance and safety certification don't apply, so it's not suitable for high-elevation homes.
What does the warranty cover?+
5 years on parts — but not labor. Budget for installation and any service labor separately, and keep your documentation.
Is it condensing?+
No — it's non-condensing at roughly 0.82 EF. No condensate drain, but it needs proper venting and uses more gas per gallon than a condensing unit.
What flow can the Marey 24L deliver at a high temperature rise?+
The headline 7.5 GPM assumes a small temperature rise. Estimated from its 170,000 BTU/h natural-gas input at about 0.82 efficiency, realistic usable flow is roughly 6.2 GPM at a 45 °F rise and about 4.0 GPM at a demanding 70 °F winter rise. That's genuine two-to-three-fixture capacity in mild climates, dropping toward two fixtures in cold ones. Remember it's rated to 2,000 ft as shipped and its warranty covers parts but not labor, so factor installation cost into the value.
Product sources
Specifications verified 2026-09-13. Manufacturer documents are treated as the primary source for model specifications. Retailer pages are used only for customer ratings and owner-feedback themes.
- Marey 24L 7.5 GPM NG — Walmart (specs & reviews) (accessed 2026-09-13)
- Marey 24L — Lowe's listing (accessed 2026-09-13)
Price range from leading retailers
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