Updated October 2026 · 5 heaters, no paid placements

Best Outdoor Propane Tankless Water Heaters in 2026

No flue through the roof, no vent run through the rim joist: these five propane units hang on an outside wall and run off the tank. They're the ones we'd look at first for a cabin, a barn or a house in mild-winter country, ranked on buyer ratings, review volume and specs.

See the ranking

In short

Our top pickFOGATTI Outdoor Propane Tankless9.1/10. The one we'd start with.$529.99 on Sep 30, 2026, may have changed

The crowd favouriteRanein 130,000 BTU Propane Outdoor710 buyer reviews (shared by its variants), 7.5/10. Plenty of owners to learn from.$579 on Sep 30, 2026, may have changed

The most flow on paperAPUS 190,000 BTU Propane Outdoor8.1 GPM per the listing, 6.9/10. The biggest figure among the rest.$629.99 on Sep 30, 2026, may have changed

For an outside wall and a propane tank, start with the FOGATTI Outdoor Propane Tankless. The other four trade flow, burner size and price in their own ways. One slot per listing family, so you're looking at five different propane units.

Natural gas instead of propane? Read the outdoor section below, or go to the best gas tankless water heaters for both fuels. Need one unit for the whole house? See the best whole-house tankless water heaters.

Written from each listing's specs and buyer reviews, not from our own use · How we rate

The ranking in detail

Gas tankless water heaters · FOGATTI · Top pick

FOGATTI Outdoor Propane Tankless

9.1Excellent · out of 10

Best for: a mild-climate house with no easy vent route

Outdoor propane on demand
Copper heat exchanger
CSA certified

The catch: Its 4.0/5 buyer rating ties for the lowest of these five.

4/5 from buyers166 buyer reviews$529.99 Price on Sep 30, 2026 · may have changed

See it on Amazon ↗Read the reviewaffiliate link to Amazon.com

Gas tankless water heaters · Ranein · Runner-up

Ranein 130,000 BTU Propane Outdoor

7.5Very good · out of 10

Best for: an outside wall instead of a flue through the roof

130,000 BTU, 5.3 GPM
Serves 3-5 outlet points
Standard 3/4" NPT fittings

The catch: No ±1 °F temperature hold claimed for the Ranein, while most units here state one.

4.2/5 from buyers710 buyer reviews, shared by 2 variants$579 Price on Sep 30, 2026 · may have changed

See it on Amazon ↗Read the reviewaffiliate link to Amazon.com

Gas tankless water heaters · APUS · Top 5 pick

APUS 190,000 BTU Propane Outdoor

6.9Good · out of 10

Best for: replacing a 40-gallon tank in a mid-size home

190,000 BTU, 8.1 GPM
App remote temperature control
Oxygen-free copper heat exchanger

The catch: The 8.1 GPM headline shrinks in a northern January.

4/5 from buyers102 buyer reviews, shared by 2 variants$629.99 Price on Sep 30, 2026 · may have changed

See it on Amazon ↗Read the reviewaffiliate link to Amazon.com

Gas tankless water heaters · Westinghouse · Top 5 pick

Westinghouse 180,000 BTU Propane Outdoor

5.5Fair · out of 10

Best for: one shower plus the kitchen in a typical family morning

8.1 GPM, 180,000 BTU
±1°F temperature stability
Built for outdoor use

The catch: Only 34 buyer reviews so far, so that average can still move.

4.3/5 from buyers34 buyer reviews$799.98 Price on Sep 30, 2026 · may have changed

See it on Amazon ↗Read the reviewaffiliate link to Amazon.com

Gas tankless water heaters · Novieex · Top 5 pick

Novieex 120,000 BTU Propane Outdoor

4.1Fair · out of 10

Best for: a cabin or a barn on propane

120,000 BTU, 5.3 GPM
6-layer safety protection
±1°F digital temp control

The catch: Outside in a hard freeze, it depends on power for its freeze protection.

5/5 from buyers20 buyer reviews$499.99 Price on Sep 30, 2026 · may have changed

See it on Amazon ↗Read the reviewaffiliate link to Amazon.com

Product images: Amazon listings

Best rated by stated maximum flow

The best-rated unit for each band of maximum flow its listing states. Count the showers that run together on a busy morning, then read across (and keep in mind that the listing figure is a mild-weather one).

Up to 5.9 GPM	Ranein 130,000 BTU Propane Outdoor (#2) · 7.5/10 · 5.3 GPM
6 to 8.9 GPM	APUS 190,000 BTU Propane Outdoor (#3) · 6.9/10 · 8.1 GPM

How to choose

Confirm the unit is rated for outdoor mounting. An outdoor-rated unit is designed to be mounted outside, with clearances and freeze protection set by its manual. Never move an outdoor or portable unit indoors unless the manufacturer lists that exact model for indoor use with the venting it specifies.
Size the propane supply as well as the heater. A high BTU/h input needs a regulator, line and tank or cylinder able to deliver it, especially in cold weather. Ask your propane supplier or a licensed gas fitter to check the supply against the stated input of the exact model.
Separate whole-house units from camping heaters. Portable propane heaters for showers and camping deliver far less flow than wall-mounted whole-house units. Match the stated maximum flow and the intended use in the listing to the job, then check the flow at your winter temperature rise.

Outdoor tankless water heaters on natural gas

Outdoor units are mostly sold for propane, but natural gas versions exist: our catalogue has 14 outdoor natural gas listing families. This list is propane only, so they sit elsewhere. Only one of them has a buyer review record so far (it competes in our gas tankless ranking); the others are rated from the specs each listing states:

A. O. Smith 10 GPM Natural Gas Outdoor: 10 GPM, 199,000 BTU/h stated · 8.0/10
Rheem RTG 8.4 GPM Natural Gas Outdoor: 8.4 GPM, 180,000 BTU/h stated · 7.7/10
Rheem RTG 7.0 GPM Natural Gas Outdoor: 7 GPM, 160,000 BTU/h stated · 7.6/10
Westinghouse Natural Gas Outdoor: 8.1 GPM, 180,000 BTU/h, 120 V stated · 7.5/10
LiberLive 130,000 BTU NG Outdoor, Gray: 5.3 GPM, 130,000 BTU/h, 110 V stated · 7.3/10
Konfino 190,000 BTU Natural Gas Outdoor: 8.1 GPM, 190,000 BTU/h, 120 V stated · 7.3/10
Rinnai REP199eN Smart-Circ: 7.6 GPM stated · 7.3/10
Rinnai RE140eN Non-Condensing: 5.3 GPM stated · 7.1/10

Check the fuel twice: an outdoor natural gas unit and its propane twin often share the photos and most of the title.

Before you hang one outside

An outdoor-rated unit is built to sit on an exterior wall, but a sheltered spot isn't automatically a legal one. The manual sets the clearances from windows, doors and vents; your gas installer checks them under local code. The PNNL guide notes that outdoor installation generally suits warm climates unless the unit and its water lines are freeze-protected. The indoor vs outdoor guide covers the rest.

Comparison table

All 5 on one screen. Tap a column header to sort by what matters at 6:45 on a weekday: flow, power or price.

Comparison table: Best Outdoor Propane Tankless Water Heaters in 2026

FOGATTI Outdoor Propane Tankless	FOGATTI	9.1	$529.99^†	Propane	Not stated	120,000 BTU/h	120 V	Outdoor	166
Ranein 130,000 BTU Propane Outdoor	Ranein	7.5	$579^†	Propane	5.3 GPM	130,000 BTU/h	Not stated	Outdoor	710 (shared)^*
APUS 190,000 BTU Propane Outdoor	APUS	6.9	$629.99^†	Propane	8.1 GPM	190,000 BTU/h	120 V	Outdoor	102 (shared)^*
Westinghouse 180,000 BTU Propane Outdoor	Westinghouse	5.5	$799.98^†	Propane	8.1 GPM	180,000 BTU/h	120 V	Outdoor	34
Novieex 120,000 BTU Propane Outdoor	Novieex	4.1	$499.99^†	Propane	5.3 GPM	120,000 BTU/h	110 V	Outdoor	20

^† Prices as of Sep 30, 2026; they may have changed. The button always shows today's price.

^* Shared: the same review pool appears on every variant of a listing family (Ranein, 2 variants; APUS, 2 variants), so the count is not specific to one variant.

How we rank

Every heater gets a score out of 10 from its exact listing. We look at what buyers give it, how many of them there are, and how completely the seller documents the specs and the warranty, then at how it stacks up against the other heaters in the list. On an exact tie, the listing slug settles the order.

We haven't installed or run these heaters ourselves, and a commission never moves a rating or a rank.

Read the methodology →Affiliate disclosure

45 % buyer rating, damped when a listing has fewer than 50 reviews.
35 % review volume, on a logarithmic scale up to 5,000 reviews.
20 % documentation: feature bullets, images and stated brand of the listing.
Flow, BTU/h input, kW and voltage show up only when the exact listing states them. A headline GPM is not your winter flow, and we measure nothing ourselves.
One slot per listing family: variants of one parent listing, which usually share one review pool, count once and are listed under the best-rated variant.
Prices carry the date we recorded them. They may have changed since; the button shows today's offer.

Frequently asked questions

Which is the best outdoor propane tankless water heater in 2026?

Our pick is the FOGATTI Outdoor Propane Tankless, at 9.1/10 (excellent). It has 166 buyer reviews averaging 4/5, and its listing states 120,000 BTU/h. Next in line: the Ranein 130,000 BTU Propane Outdoor at 7.5/10.

How is this ranking built?

We start from 13 complete propane tankless units whose exact listing states outdoor (or indoor and outdoor) mounting, each with a buyer review record. Each one gets a rating out of 10: 45 % buyer rating, 35 % review volume and 20 % how completely the listing documents its specs. Variants of one listing family (same parent listing) share a single slot, so you see 5 different heaters rather than one heater in 5 sizes.

Is a higher GPM always better?

Not on its own. A listing usually quotes its maximum flow at a gentle temperature rise, and the usable flow falls when the incoming water is cold. In this ranking, the listings that state a maximum flow give 5.3 GPM to 8.1 GPM. Size from the flow you need at your winter rise; our flow-rate calculator does that arithmetic.

Can an outdoor propane unit go inside the house?

Only if the maker lists that exact model for indoor use, with the venting it specifies. An outdoor unit is built to hang outside; its manual sets the clearances, the freeze protection and the gas supply, and a licensed gas installer confirms the spot under your local code.

Will an outdoor tankless water heater freeze?

It can. PNNL notes that outdoor installation generally suits warm climates unless both the unit and its water pipes are freeze-protected. Read how the exact model protects itself from freezing in its manual, and what that protection needs to keep working, before you mount it on a north wall.

Do outdoor tankless water heaters need venting?

They exhaust at the unit itself, so there is no flue through the house. The manual still sets clearances from windows, doors, vents and the ground, and your installer confirms the spot under local code.

Is there an outdoor natural gas tankless water heater?

Yes. Our catalogue lists 14 outdoor natural gas listing families (see the section above). This ranking is propane only; for both fuels in one list, see the gas tankless ranking.

Are the prices up to date?

Each price is the one we recorded on Sep 30, 2026, and it may have changed since. The button always opens the exact listing with today's price and seller.

Have you installed these water heaters yourselves?

No, we haven't installed them in a house of our own. The ratings come from what buyers say and from the specs stated in each exact listing, weighed with a formula we publish.

Tankless flow-rate calculator →Buying guide: how to choose a tankless water heater →Best Tankless Water Heaters in 2026 →Best Whole-House Electric Tankless Water Heaters in 2026 →Best High-Efficiency Condensing Tankless Water Heaters in 2026 →Best Gas Tankless Water Heaters in 2026 →Best Whole-House Tankless Water Heaters in 2026: Gas and Electric →All rankings →Comparison tool →

Gas tankless water heaters →Ranein →Westinghouse →APUS →Novieex →Buying guides →