Marey GA10LP
Amazon customer rating as of
Tankless Geek editorial score: 3.7/5
The Marey GA10LP (Power Gas 10L) is a small, no-electricity point-of-use propane tankless: about 79,000 BTU/h, up to 3.1 GPM, roughly 87% thermal efficiency, with a copper heat exchanger and a summer/winter control knob for seasonal temperature stability. Despite older listings that call it a "standing pilot" unit, it actually uses two D-cell batteries for ignition and has no electrical connection — which, combined with a low 10 PSI minimum operating pressure, makes it a favorite for cabins, tiny homes, and low-pressure or off-grid setups.
It's a single-fixture heater by design — Marey positions it for households using one hot-water application at a time. At 79,000 BTU it delivers its 3.1 GPM only with warm inlet water, dropping to about 2 GPM in the cold. Because it's a combustion appliance, it must be vented and given adequate combustion air per Marey's instructions — it is not a sealed outdoor camp unit. For a buyer who wants simple, power-free propane hot water for a small load, it's inexpensive and capable, with the usual Marey caveat about customer support.
Key Features
Best Use Cases
Our Verdict
A simple, power-free propane point-of-use heater for cabins, tiny homes, and low-pressure setups — its battery ignition and 10 PSI minimum are the draw. Right for a single fixture, not a household. Vent it properly, size expectations to one tap, and go in aware of Marey's uneven support.
Technical Specifications
| Input | ≈79,000 BTU/h (propane) |
|---|---|
| Max flow | Up to 3.1 GPM (10 L/min) |
| Efficiency | ≈87% thermal, non-condensing |
| Ignition | 2 D-cell batteries (no electricity) — not a pilot |
| Min pressure | ≈10 PSI to operate |
| Controls | Summer/winter knob; copper heat exchanger |
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 (79,000 BTU × 0.87 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 | 3.1 GPM |
| 45 °F | Mild climate (65 °F in → 110 °F) | 3.06 GPM |
| 60 °F | Cool climate (50 °F in → 110 °F) | 2.3 GPM |
| 70 °F | Cold climate (40 °F in → 110 °F) | 2 GPM |
Usable flow at a 110 °F target: BTU × thermal-eff ÷ (ΔF × 500), capped at the 3.1 GPM maximum (~87% thermal). The summer/winter knob helps hold temperature across seasons.
Pros
Cons
Buy it if…
- Cabins, tiny homes, and single-fixture point-of-use needs
- Off-grid or power-free installs (D-cell ignition, no electricity)
- Low-water-pressure setups (operates from ~10 PSI)
- Budget buyers wanting simple propane hot water
Skip it if…
- Households needing more than one fixture at a time
- Buyers wanting a sealed outdoor/portable camp heater
- Anyone needing dependable manufacturer support
Installation Requirements
Professional vs DIY
Straightforward owner setup for cabins and outdoor use — connect propane, water, and batteries — but ventilate properly and never run it in a closed room.
Ignites on 2 D-cells (not a pilot light), so it needs no power outlet.
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 (3.7/5 Amazon customer rating, 234 ratings, as of 2026-09-18). These are owner opinions, not our own bench testing.
Owners value that it runs with no electricity — just batteries and propane — making it easy for cabins and off-grid use.
The ~10 PSI minimum lets it operate where water pressure is limited, a plus for gravity or small-pump systems.
Reviewers are clear it suits one tap at a time; expecting whole-home flow leads to disappointment.
As with Marey generally, some owners report difficulty reaching the company for parts or warranty help.
Marey GA10LP FAQ
Does the GA10LP use a standing pilot?+
No — despite some older listings, it uses two D-cell batteries for ignition and has no standing pilot and no electrical connection. That's part of what makes it suited to off-grid use.
Can it run a whole house?+
No. It's a point-of-use unit for one fixture at a time, delivering up to 3.1 GPM with warm inlet water and about 2 GPM in the cold.
Does it need venting?+
Yes. It's a combustion appliance and must be vented with adequate combustion air per Marey's instructions — it is not a sealed outdoor camp heater.
Will it work with low water pressure?+
Yes — it operates from around 10 PSI, so it suits homes and cabins with modest water pressure.
What hot-water flow can the GA10LP deliver in cold weather?+
It's a small heater, so cold inlet water limits it quickly. Estimated from its roughly 79,000 BTU/h propane input, realistic usable flow is about 2.8 GPM at a mild 45 °F rise and closer to 1.8 GPM at a 70 °F winter rise, versus the 3.1 GPM warm-inlet rating. That makes it a natural point-of-use, cabin, outdoor-shower, or warm-climate heater for one fixture at a time rather than a whole-home unit. Its battery ignition means it needs no electricity, but it does need at least about 10 PSI of water pressure to fire.
Product sources
Specifications verified 2026-09-18. Manufacturer documents are treated as the primary source for model specifications. Retailer pages are used only for customer ratings and owner-feedback themes.
- Marey GA10LP Power 10L — Amazon listing (accessed 2026-09-18)
- Marey GA10LP — Water Heater Manuals (specs) (accessed 2026-09-18)
- Marey official manuals & documentation (accessed 2026-09-18)
Price range from leading retailers
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