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Rheem RTGH 9.5 GPM Propane Indoor Review

Name: Rheem RTGH 9.5 GPM Propane Indoor
Brand: Rheem
SKU: B0C826BQG3

7.8Very good · out of 10Rated from the listing's specs, no buyer reviews yet

Written from the listing's specs, not from our own use · How we rate

A 9.5 GPM maximum flow, condensing efficiency and a ±1 °F temperature hold: the Rheem RTGH 9.5 GPM Propane Indoor covers what matters most in an indoor gas tankless heater. With freeze protection as well, it suits swapping a 50-gallon tank for a house with three bathrooms.

Price$1,383.15Price on Sep 30, 2026 · may have changed

Check the price on Amazon ↗Affiliate link · price and stock on Amazon

Compare side by side ↗

Specifications

Brand	Rheem
Category	Gas tankless water heaters
Fuel	Propane
Stated mounting location	Indoor
Stated maximum flow	9.5 GPM
Stated gas input	199,900 BTU/h
Condensing design	Stated in the listing title
Flow at a stated rise	9.5 GPM at a 35 °F rise
Temperature hold	±1 °F, per the listing
Freeze protection	Stated in the listing
Stated warranty	15 years on the heat exchanger
ASIN	B0C826BQG3

Full listing title: Rheem RTGH Series 9.5 GPM Liquid Propane Tankless Water Heater Indoor | 199,900 BTUs Super High Efficiency On Demand, Continuous Hot Water | Condensing Ultra-Low Nox

Listing evidence

Fuel	Liquid Propane Full listing title
Stated mounting location	Indoor Full listing title
Stated maximum flow	9.5 GPM Full listing title
Stated gas input	199,900 BTUs Full listing title
Condensing design	Condensing Full listing title

Updated October 2026

Exact listing, ASIN B0C826BQG3

Rating from a published formula

Compared with its closest rivals

Two gas tankless heaters on propane too, with about the same flow, closest to it on our rating, each with a dated price.

Compare side by side ↗

Rheem RTGH 9.5 GPM Propane Indoor

7.8Very good · out of 10$1,383.15 Price on Sep 30, 2026 · may have changed

Stated: 9.5 GPM · 199,900 BTU/h
Gas tankless water heaters

This product ↑

Rheem RTG 8.4 GPM Propane Indoor

7.6Very good · out of 10$953 Price on Sep 30, 2026 · may have changed

Stated: 8.4 GPM · 180,000 BTU/h
Gas tankless water heaters

See the review ↗

Noritz NR98SVLP Indoor Propane

7.4Good · out of 10$1,590.70 Price on Sep 30, 2026 · may have changed

Stated: 9.8 GPM · 199,900 BTU/h
Gas tankless water heaters

See the review ↗

Up to 9.5 GPM from a 199,900 BTU burner

That's the maximum flow the listing states, at a 35 °F rise. With January water coming in at 42 °F and a 105 °F shower, the rise is 63 °F and the real flow is lower; the maker's flow chart has that number. Our calculator counts a shower at 2 GPM, so on paper that's room for three showers at once, fewer when January water comes in cold.

What it has going for it

What changes in the morning shower rush

Condensing. A second heat exchanger pulls heat out of the exhaust before it leaves, so more of the gas you pay for ends up in the water. The exhaust runs cool enough for plastic vent pipe, and the condensate needs a drain.

±1 °F hold. The burner adjusts as the flow changes, so the shower stays where you set it when somebody opens the kitchen tap. On paper, at least: that is the seller's claim.

One shower at a time, or two?

Two at once: up to 9.5 GPM, and our calculator counts a shower at 2 GPM, so that's two showers and a tap on paper. The listing gives 9.5 GPM at a 35 °F rise and the seller says it serves up to 3 showers. The January answer is in the flow chart, on the 63 °F rise line.

One at a time: a smaller unit covers that for less money.

Great for you if…

Two showers and the dishwasher run at the same time in your house
You care about the gas bill as much as the hot water
A shower that suddenly runs cold drives you mad

Skip it if…

You'd rather wait for buyer reviews: none are captured for this listing yet
The far bathroom already waits a minute for hot water: no built-in recirculation is named

Gas, venting and what's in the box

What the Rheem RTGH 9.5 GPM Propane Indoor listing names:

Up to 9.5 GPM
9.5 GPM at a 35 °F rise
199,900 BTU/h input
Propane
Indoor mounting
Condensing
±1 °F temperature hold claimed
Freeze protection named
Low NOx
CSA, ETL or UL mark named

Warranty & support: 15-year warranty on the heat exchanger, as stated in the listing · CSA, ETL or UL certification named in the listing.

That is the maker's promise, not ours. Keep the invoice, register the Rheem RTGH 9.5 GPM Propane Indoor if the maker asks, and read the install conditions: many tankless warranties need a licensed install and regular flushing.

Read the installation manual for the vent, the gas line size and the clearances before you order; it overrides anything above.

Rheem RTGH 9.5 GPM Propane Indoor, view 3

Price and cost per GPM of stated flow

$1,383.15 Price on Sep 30, 2026 · may have changed

At the price on Sep 30, 2026, each GPM of stated maximum flow works out at about $145.59 (price ÷ stated GPM, our arithmetic). That puts it in the pricier third of the 45 indoor gas tankless heaters we have a price and a stated flow for.

Count the install in the budget: vent pipe, possibly a 3/4" gas line, and a licensed plumber or gas fitter.

The button opens the exact listing (ASIN B0C826BQG3), where today's price, stock and seller apply.

Rheem RTGH 9.5 GPM Propane Indoor, view 4

A better fit for your house?

On natural gas, not propane? The MIZUDO 199,000 BTU Natural Gas Indoor (9.2/10) runs on natural gas.

Only one bathroom? The ThermoMate CZ422LP Propane Indoor (7.8/10) states up to 5 GPM.

Want to spend less? The Rheem RTG 8.4 GPM Propane Indoor (7.6/10) was listed at $953 on Sep 30, 2026.

Our take

The verdict

Our favourite thing about the Rheem RTGH 9.5 GPM Propane Indoor is a 9.5 GPM maximum flow, closely followed by condensing efficiency. No buyer reviews yet, so the Rheem RTGH 9.5 GPM Propane Indoor has to win you over on paper. Where it falls short: the headline GPM is a mild-weather figure, so leave yourself margin for January. We'd pick it if two showers and the dishwasher run at the same time in your house; otherwise, put it next to the Ranein 190,000 BTU Natural Gas Indoor first.

Check the price on Amazon ↗Affiliate link · price and stock on AmazonAll gas tankless water heaters →

Living with it

Install day

Old tank out, unit on the wall, vent through the wall or the roof. Plan the gas line for 199,900 BTU/h; a licensed pro handles it, and often a permit.

The first shower

Hot water arrives after the cold already in the pipes, then stays (within ±1 °F, per the listing). A trickle from a bathroom tap may not light the burner; open it a bit more.

The first winter

January water comes in colder, so the same unit gives fewer GPM. The listing's 9.5 GPM is at a 35 °F rise; a northern winter asks for about 63 °F. Stagger the showers if you sized it tight.

Once a year

Flush the heat exchanger with a pump and a descaler (the service valves make it an hour's job), check the condensate drain and the neutralizer, and clean the inlet filter. Our flushing and descaling guide has the checklist.

The one thing we'd check first

Before the Rheem RTGH 9.5 GPM Propane Indoor goes in your cart, check your winter rise: it is rated 9.5 GPM at a 35 °F rise, and a northern winter asks for nearer 63 °F.

Before you buy

Your winter flow

Find your winter inlet temperature (your water utility or a thermometer at the cold tap in January), subtract it from 105 °F, and read the maker's flow chart at that rise. Our sizing guide shows how.

Vent and gas line

A licensed plumber or gas fitter confirms the vent route, the combustion air and a gas line that can deliver 199,900 BTU/h. Get that quote before you order; our installation guide lists what they will ask.

The condensate

A condensing unit drips acidic water that needs a drain, often through a neutralizer. Our condensing guide explains the extra parts.

Flushing

Hard water scales the heat exchanger. Service valves on the water lines turn the yearly flush into an hour with a bucket and a pump; our flushing and descaling guide shows the routine.

How it compares

How the Rheem RTGH 9.5 GPM Propane Indoor stacks up against the closest alternative, the Ranein 190,000 BTU Natural Gas Indoor.

Criterion	Rheem RTGH 9.5 GPM Propane Indoor	Ranein 190,000 BTU Natural Gas Indoor
Our rating	7.8/10	7.9/10
Max flow	9.5 GPM	8.5 GPM
Gas input	199,900 BTU/h	190,000 BTU/h
Efficiency	Condensing	Not stated
Temperature hold	±1 °F stated	Not stated
Buyer reviews	None captured	710 · 4.2/5

Pick the Ranein 190,000 BTU Natural Gas Indoor if you want our higher-rated option (7.9/10); stay with the Rheem RTGH 9.5 GPM Propane Indoor for more flow (9.5 GPM) and a bigger burner (199,900 BTU/h).

Compare side by side ↗See the Ranein 190,000 BTU Natural Gas Indoor review →

The score in detail

How we rated it

Spec-based rating on a 4.5–8.5 scale: 4.5 + average of the 4 criteria × 0.4. Capped at 8.5 because no customer evidence is included.

Key specifications

9 / 10

Build, warranty & certifications

8 / 10

Listing documentation

8 / 10

Fit & compatibility

8 / 10

This product has no captured buyer-review record yet, so its rating comes from the documented listing alone: four criteria scored out of 10 (key specifications; build, warranty and certifications; listing documentation; fit and compatibility), placed on a 4.5–8.5 scale. Read the full methodology.

Read the methodology →

Frequently asked questions

Is the Rheem RTGH 9.5 GPM Propane Indoor any good?

We rate it 7.8/10 (very good). The rating comes from its documented listing alone, as no customer-review record is captured yet.

How much hot water can the Rheem RTGH 9.5 GPM Propane Indoor deliver?

The listing states a maximum flow of 9.5 GPM and a gas input of 199,900 BTU/h. The headline flow is a mild-weather number: with cold winter water coming in, the same unit gives you less. Read the maker's flow chart at your winter rise, or let our flow-rate calculator do the sums.

Can the Rheem RTGH 9.5 GPM Propane Indoor be installed indoors?

Yes, the listing says indoor mounting. That means a vent route to the outside, combustion air and a gas line sized for the unit, all as the maker and your local code require. A licensed plumber or gas fitter sorts that out.

What do you get with the Rheem RTGH 9.5 GPM Propane Indoor?

Its listing states up to 9.5 GPM, a condensing heat exchanger, temperature held within ±1 °F, freeze protection and a 15-year heat exchanger warranty. These are the seller's figures, not our measurements: how steady the temperature is in your shower and how it copes with your winter water can't be read from a listing.

What should I check before ordering the Rheem RTGH 9.5 GPM Propane Indoor?

Your winter flow: find your winter inlet temperature (your water utility or a thermometer at the cold tap in January), subtract it from 105 °F, and read the maker's flow chart at that rise. Our sizing guide shows how. Vent and gas line: a licensed plumber or gas fitter confirms the vent route, the combustion air and a gas line that can deliver 199,900 BTU/h. Get that quote before you order; our installation guide lists what they will ask. The condensate: a condensing unit drips acidic water that needs a drain, often through a neutralizer. Our condensing guide explains the extra parts. Flushing: hard water scales the heat exchanger. Service valves on the water lines turn the yearly flush into an hour with a bucket and a pump; our flushing and descaling guide shows the routine.

Where can I buy the Rheem RTGH 9.5 GPM Propane Indoor?

We link to the exact listing on Amazon, where today's price, stock and seller apply. It is an affiliate link, and it has no effect on the rating.

Have you used the Rheem RTGH 9.5 GPM Propane Indoor yourselves?

No, we haven't used it ourselves. Everything on this page comes from its listing, read line by line and weighed with our published formula.

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