Quick Answer: The best Marey tankless water heater depends on the fuel and fixture count you need. For a general-purpose propane install — cabin, workshop, small home — the GA10LP (10L, 3.1 GPM, 68,240 BTU, battery ignition, roughly $200–$245) is the pick. For a single point-of-use fixture on standard household wiring, the PP110 (Power Pak Plus, 110V, 4.4 kW, 2.0 GPM, roughly $150–$220) is the simplest option. For whole-house electric coverage in a warm climate, the ECO270 (220V, 27 kW, 6.5 GPM, roughly $550–$650) is Marey’s largest current unit, though it needs three 50-amp double breakers most homes don’t already have. Marey has sold tankless heaters since 1955 and spans natural gas, propane, and 110V/220V electric in one budget-tier lineup — wider fuel coverage than Camplux or Eccotemp, which are propane-only.
Marey shows up constantly in budget tankless searches because it’s one of the only brands selling across all three fuel types — natural gas, liquid propane, and electric — at a noticeably lower price point than Rinnai, Rheem, or Navien. That breadth is also what makes picking a model confusing: a “Marey tankless water heater” could mean a 10-liter gas unit, a 4.4 kW point-of-use plug-in, or a 27 kW whole-house electric heater, and they solve completely different problems. This guide ranks the three models people actually search for so you can match the right Marey to your setup instead of guessing between similar-sounding SKUs.
Last updated August 26, 2026 — re-verified pricing against 2 independent sources: the GA10LP now checks out at $201.59–$241.91 (Home Depot’s sale and regular price) and $229.99 at Prime Suppliers, meaningfully below the $280–$320 previously published here, so the range above has been corrected down to $200–$245. The PP110 and ECO270 prices could not be independently re-confirmed against current retailer listings this pass and remain as previously published.
Our top picks at a glance
| Model | Best for | Fuel | Flow / Output | Power needed | Price |
|---|---|---|---|---|---|
| Marey GA10LP | General propane install | Propane (LP) | 3.1 GPM / 68,240 BTU | Battery ignition | ~$200–$245 |
| Marey PP110 | Single point-of-use fixture | Electric | 2.0 GPM / 4.4 kW | Dedicated 110–120V circuit | ~$150–$220 |
| Marey ECO270 | Whole-house electric (warm climate) | Electric | 6.5 GPM / 27 kW | Three 50A double breakers, 220V | ~$550–$650 |
GA10LP price per Home Depot's GA10FLPOB listing on the same 10L chassis; PP110 and ECO270 prices are typical ranges seen across Amazon, Lowe's, and Walmart listings. Amazon pricing fluctuates and can run above or below these figures.
By the numbers
- 68,240 BTU rated output on the GA10LP’s 10-liter chassis, per Home Depot’s Marey product listing — enough for one shower or two smaller fixtures at a warm inlet, not simultaneous whole-house use.
- 27 kW draw on the ECO270 at full output, per Lowe’s product listing, which is why Marey specifies three 50-amp double-pole breakers for installation — most homes need a panel upgrade before this unit is an option.
- 38°F typical temperature rise the ECO270 can sustain at its rated 6.5 GPM, per Marey’s own use-and-care documentation — workable for Southern-climate groundwater but a meaningfully lower usable flow anywhere the incoming water runs colder.
- 24–34% more energy efficient than a standard storage tank for a home using up to roughly 41 gallons of hot water a day, per the U.S. Department of Energy — the baseline efficiency case for tankless heating generally, independent of brand.
1. Marey GA10LP — Best General-Purpose Propane Install
Marey GA10LP 10L Propane Tankless Water Heater
- Marey's mid-size propane chassis — battery-powered ignition means no household wiring is required, just a propane line and a water hookup.
- The same 10-liter body is also sold as the GA10FLP/GA10FLPOB (2.64 GPM/68,240 BTU listing) and as GA10FNG for natural gas — confirm which fuel-line variant you're ordering, since LP and NG units are not interchangeable.
- Digital Panel (DP) versions add a temperature readout for a modest premium if you want finer control than the flow-only base model.
Get your tankless heater and fittings in two days — try Amazon Prime free for 30 days.
The GA10LP is the Marey most people land on when they search the brand name generically — a 10-liter propane unit sized for a cabin, workshop, small apartment, or a single-bathroom home, not a full multi-bathroom house. Because Marey sells this same chassis under several closely related model numbers (GA10LP, GA10FLP, GA10FLPOB, plus the natural-gas GA10FNG), double-check the exact SKU and fuel type on the listing before ordering — the GPM figure alone varies slightly by which listing you’re reading (2.64 vs 3.1 GPM), even though the BTU rating and physical unit are essentially the same. If your home runs natural gas rather than propane, look specifically for the FNG-suffixed version rather than assuming any Marey 10L model will work with your existing gas line.
2. Marey PP110 — Best Single Point-of-Use Fixture
Marey PP110 Power Pak Plus Electric Tankless Water Heater
- Runs on standard 110–120V household voltage rather than the 220V most whole-home electric tankless units need, but still requires a dedicated circuit and breaker — not a shared outlet.
- Sized for exactly one fixture at a time: a bathroom sink, a shop sink, or a single lavatory faucet, not a full bathroom or kitchen.
- Compact wall-mount housing makes it a common pick for a detached garage, workshop, or an addition where running a full water heater line isn't practical.
The PP110 solves a different problem than the GA10LP and ECO270 entirely: it’s for a single fixture that needs hot water but doesn’t justify running gas or a 220V circuit. At 4.4 kW and 2.0 GPM it delivers meaningfully less flow than either the propane or the 27 kW electric option — enough for a trickle of warm water at a sink, not a shower with real pressure. Marey also sells a 220V Power Pak Plus variant at 8.8 kW with roughly double the output if 110V feels too limited for your fixture; see our best point-of-use water heater guide for how the PP110 compares against Rheem and Stiebel Eltron point-of-use models in the same category.
3. Marey ECO270 — Best Whole-House Electric (Warm Climate)
Marey ECO270 27kW Whole-House Electric Tankless Water Heater
- Marey's largest current electric model — self-modulating output means it only draws the power needed for the current flow rate rather than running at full 27 kW constantly.
- Requires three 50-amp double-pole breakers on a 220V circuit, which most existing homes don't have without an electrical panel upgrade — budget for that cost separately from the unit price.
- Rated for multiple simultaneous points of use only in warmer climates with higher groundwater temperatures; in colder regions the same unit supports fewer fixtures running at once at its rated 38°F rise.
The ECO270 is Marey’s answer to a whole-home electric heater, and it competes on price against EcoSmart and Stiebel Eltron’s largest units rather than against Marey’s own smaller PP110. The tradeoff for that lower price is the same one every high-kW electric tankless heater makes: it needs serious electrical infrastructure (three 50A breakers, heavy-gauge wire runs) that a gas unit doesn’t. For homes in the Southern U.S. with warmer incoming groundwater, that infrastructure cost buys genuine whole-house coverage; for colder-climate homes, see our best electric tankless water heater guide, where climate-adjusted GPM expectations are covered in more depth.
How to choose a Marey tankless water heater
- General propane install — cabin, workshop, small home: the GA10LP — the best balance of output, price, and no-electricity simplicity.
- Single point-of-use fixture on household wiring: the PP110 — the only Marey here that runs on standard 110–120V, at the cost of low flow.
- Whole-house electric in a warm climate: the ECO270 — Marey’s highest-output current unit, but only after confirming your panel can support three 50A breakers.
- Natural gas instead of propane: look for the FNG-suffixed version of the same chassis (for example GA10FNG) rather than the LP model.
- Comparing against other budget brands: Marey’s fuel-type range is broader than Camplux or Eccotemp, which sell propane-only portable units — see our best Camplux tankless water heater and best Eccotemp tankless water heater guides for that comparison.
The bottom line
Marey’s lineup spans three fuel types under one budget-tier brand, and each of the three models here earns its spot for a different reason: the GA10LP for a straightforward propane install, the PP110 for a single fixture on regular household wiring, and the ECO270 for whole-house electric coverage in a warm climate. None of them match Rinnai or Rheem on premium features, but Marey’s fuel-type breadth is a genuine advantage if your home’s existing utilities don’t fit the propane-only or natural-gas-only brands. For a full lineup of every major brand side by side, start with our best tankless water heater roundup or best propane tankless water heater guide.