Product images: Amazon listings

Rheem Prestige Condensing Natural Gas Review

Name: Rheem Prestige Condensing Natural Gas
Brand: Rheem
SKU: B077VT17MW

4.4Fair · out of 10#5 of 5 in our High-Efficiency Condensing Tankless ranking

Written from the listing and 27 buyer reviews, not from our own use · How we rate

On paper, the Rheem Prestige Condensing Natural Gas gets the important things right: an 11 GPM maximum flow, condensing efficiency and built-in recirculation. It earned a spot in our top 5 high-efficiency condensing tankless water heaters, and it's built for a busy house where two showers and the dishwasher overlap.

Price$1,199.99Price on Sep 30, 2026 · may have changed

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

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Specifications

Brand	Rheem
Category	Gas tankless water heaters
Fuel	Natural gas
Stated mounting location	Indoor
Stated maximum flow	11 GPM
Condensing design	Stated in the listing title
Built-in recirculation	Stated in the listing
Buyer reviews	27 · 3.3/5
ASIN	B077VT17MW

Full listing title: Rheem Prestige Condensing Tankless Gas Indoor Natural Gas Water Heater With Built-in Recirculation 11.0 GPM - RTGH-RH11DVLN

Listing evidence

Fuel	Natural Gas Full listing title
Stated mounting location	Indoor Full listing title
Stated maximum flow	11.0 GPM Full listing title
Condensing design	Condensing Full listing title

Updated October 2026

Exact listing, ASIN B077VT17MW

Rating from a published formula

Compared with its closest rivals

The two picks next to it in our high-efficiency condensing tankless water heaters ranking, with their rating and a dated price.

Compare side by side ↗

Rheem Prestige Condensing Natural Gas

4.4Fair · out of 10$1,199.99 Price on Sep 30, 2026 · may have changed

Stated: 11 GPM
27 buyer reviews
Gas tankless water heaters

This product ↑

Takagi T-H3S-DV-N Condensing Indoor

4.5Fair · out of 10See current price ↗

Stated: 8 GPM
25 buyer reviews
Gas tankless water heaters

See the review ↗

Rinnai RX160iN Condensing Smart Sense

6.8Good · out of 10$1,442.70 Price on Sep 30, 2026 · may have changed

Stated: 9 GPM
70 buyer reviews
Gas tankless water heaters

See the review ↗

Up to 11 GPM

That's the maximum flow the listing states, and headline flows are usually quoted at a mild temperature 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. At 2 GPM a shower (our calculator's figure), the headline means room for three showers at once, fewer when January water comes in cold.

Why it made our list

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.

Built-in recirculation. It can keep hot water moving in the pipes, so the far bathroom gets warm in seconds instead of after a gallon down the drain. Check whether your house has a return line or needs a crossover valve.

One shower at a time, or two?

Two at once: up to 11 GPM, and our calculator counts a shower at 2 GPM, so that's two showers and a tap on paper. How much of it is left in January is on the maker's flow chart, at a 63 °F rise.

One at a time: then it's more heater than you need, with the gas line and the vent to match. A smaller unit may do the job for less.

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
The far bathroom takes ages to run hot

Skip it if…

You want a long review record: only 27 buyer reviews so far
Star ratings come first for you: 3.3/5 is below the 4.1 average of this ranking
You simply want our top pick: that's the Rinnai RU199iN Condensing (9.1/10)

Gas, venting and what's in the box

What the Rheem Prestige Condensing Natural Gas listing names:

Up to 11 GPM
Natural gas
Indoor mounting
Condensing
Built-in recirculation

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

Rheem Prestige Condensing Natural Gas, view 3

Price and cost per GPM of stated flow

$1,199.99 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 $109.09 (price ÷ stated GPM, our arithmetic). That puts it around the middle of the 45 indoor gas tankless heaters we have a price and a stated flow for.

The online price is the heater alone. Venting, a bigger gas line where needed and the installer's day are a separate bill, often as big as this one.

The button opens the exact listing (ASIN B077VT17MW), where today's price, stock and seller apply.

Rheem Prestige Condensing Natural Gas, view 4

A better fit for your house?

No easy route for a vent pipe? The A. O. Smith 10 GPM Natural Gas Outdoor (8.0/10) mounts on an outside wall, per its listing.

On propane, not natural gas? The Rheem RTGH 9.5 GPM Propane Indoor (7.8/10) runs on propane.

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

Our take

The verdict

Our favourite thing about the Rheem Prestige Condensing Natural Gas is an 11 GPM maximum flow, closely followed by condensing efficiency. Only 27 buyers have rated it so far (3.3/5), so treat the score as an early read. Honestly, the catch: their 3.3/5 average sits under the 4.1 of this ranking. We'd pick it if two showers and the dishwasher run at the same time in your house; otherwise, put it next to the Takagi T-H3S-DV-N Condensing Indoor first.

Check the price on Amazon ↗Affiliate link · price and stock on AmazonSee the high-efficiency condensing tankless water heaters ranking →

Living with it

Install day

Old tank out, unit on the wall, vent through the wall or the roof. a licensed pro handles it, and often a permit.

The first shower

Hot water arrives after the cold already in the pipes, then stays. 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. 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.

What buyers say

Buyers give it 3.3/5, a mixed record, below this ranking's 4.1 average. Only 27 reviews so far, and our formula damps averages built on fewer than 50.

The numbers

Buyer rating: 3.3/5
Reviews: 27
This ranking's average: 4.1/5

The one thing we'd check first

Before you order the Rheem Prestige Condensing Natural Gas, check your winter flow: 11 GPM is a best case, so run your January numbers in our calculator first.

Before you buy

Your winter flow

Count the fixtures that run together on a busy morning (our calculator uses 2 GPM a shower, 1.5 for the kitchen), then compare with the maker's chart. 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 its full input. 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 Prestige Condensing Natural Gas stacks up against the closest alternative in our ranking, the Takagi T-H3S-DV-N Condensing Indoor.

Criterion	Rheem Prestige Condensing Natural Gas	Takagi T-H3S-DV-N Condensing Indoor
Our rating	4.4/10	4.5/10
Max flow	11 GPM	8 GPM
Fuel	Natural gas	Natural gas
Mounting	Indoor	Indoor
Buyer reviews	27 · 3.3/5	25 · 4.4/5

Pick the Takagi T-H3S-DV-N Condensing Indoor if you want our higher-rated option (4.5/10), with a higher buyer rating (4.4/5); stay with the Rheem Prestige Condensing Natural Gas for more flow (11 GPM).

Compare side by side ↗See the Takagi T-H3S-DV-N Condensing Indoor review →

The score in detail

How we rated it

Our score: 4.4/10

Buyer rating (45%)

16.0 / 45

3.3/5 average, confidence-damped (27 reviews < 50)

Review volume (35%)

13.7 / 35

27 buyer reviews

Documented specifications (20%)

14.0 / 20

70/100 listing documentation score

Our rating is an evidence index on a 0–10 scale. It is not a buyer star rating, and we have not used the product ourselves.

Buyer rating (45%): the captured average for this exact listing, damped when there are fewer than 50 reviews.
Review volume (35%): more reviews mean more reliable evidence, on a logarithmic scale up to 5,000 reviews.
Documented specifications (20%): how completely the exact listing documents the attributes that matter.

Our editors then look at how it compares with the other heaters we rate. A commission is never an input to the rating. Read the full methodology.

Read the methodology →

Frequently asked questions

Is the Rheem Prestige Condensing Natural Gas any good?

We rate it 4.4/10 (fair), #5 of 5 in our high-efficiency condensing tankless water heater ranking. It is based on 27 buyer reviews averaging 3.3/5 and the specifications stated in the listing.

How much hot water can the Rheem Prestige Condensing Natural Gas deliver?

The listing states a maximum flow of 11 GPM. 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 Prestige Condensing Natural Gas 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 Prestige Condensing Natural Gas?

Its listing states up to 11 GPM, a condensing heat exchanger and a built-in recirculation pump. 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 Prestige Condensing Natural Gas?

Your winter flow: count the fixtures that run together on a busy morning (our calculator uses 2 GPM a shower, 1.5 for the kitchen), then compare with the maker's chart. 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 its full input. 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 Prestige Condensing Natural Gas?

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 Prestige Condensing Natural Gas yourselves?

No, we haven't used it ourselves. Everything on this page comes from its listing and 27 buyer reviews, read line by line and weighed with our published formula.

Keep comparing

If the Rheem Prestige Condensing Natural Gas hasn't sold you yet, see where it ranks or browse all gas tankless water heaters.

Where it ranks

Best High-Efficiency Condensing Tankless Water Heaters in 2026 →

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