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Written from the listing and 21 buyer reviews, not from our own use · How we rate
If you're after up to 7.1 GPM, the Noritz NRC71DVNG Condensing Natural Gas delivers, with a condensing heat exchanger on top. Rated 3.9/10, it suits one shower plus the kitchen in a typical family morning.
| Brand | Noritz |
|---|---|
| Category | Gas tankless water heaters |
| Fuel | Natural gas |
| Stated mounting location | Indoor |
| Stated maximum flow | 7.1 GPM |
| Condensing design | Stated in the listing title |
| Buyer reviews | 21 · 4.1/5 |
| ASIN | B00MBBHARC |
Full listing title: Noritz NRC71DVNG Indoor Condensing Direct Vent Tankless Water Heater, 7.1 GPM - Natural Gas
| Fuel | Natural GasFull listing title |
|---|---|
| Stated mounting location | IndoorFull listing title |
| Stated maximum flow | 7.1 GPMFull listing title |
| Condensing design | CondensingFull listing title |
Two gas tankless heaters on natural gas too, with about the same flow, closest to it on our rating, each with a dated price.
That's the maximum flow the listing states, and headline flows are usually quoted at a mild temperature rise. In January the water comes in nearer 42 °F, so a 105 °F shower needs a 63 °F rise and the unit gives you less; the flow chart in the manual shows how much less. Our calculator counts a shower at 2 GPM, so on paper that's two showers and a kitchen tap, less when the water comes in cold.
What it has going for it
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.
One at a time, plus the kitchen tap: 7.1 GPM covers that on paper.
Two at once: possible where the tap water comes in warm. In a northern January the second shower is the one that runs lukewarm, so read the flow chart at a 63 °F rise first.
What the Noritz NRC71DVNG Condensing Natural Gas listing names:
Read the installation manual for the vent, the gas line size and the clearances before you order; it overrides anything above.
At the price on Sep 30, 2026, each GPM of stated maximum flow works out at about $187.36 (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.
The heater is often the smaller half of the bill: the venting, a gas line that may need upsizing and a licensed installer's day come on top.
The button opens the exact listing (ASIN B00MBBHARC), where today's price, stock and seller apply.
Two showers and the dishwasher at once? The MIZUDO 199,000 BTU Natural Gas Indoor (9.2/10) states up to 10.3 GPM.
No easy route for a vent pipe? The Rheem RTG 8.4 GPM Natural Gas Outdoor (7.7/10) mounts on an outside wall, per its listing.
On propane, not natural gas? The Marey 170,000 BTU Propane Indoor (7.6/10) runs on propane.
Our take
The Noritz NRC71DVNG Condensing Natural Gas earns its place with up to 7.1 GPM and a condensing heat exchanger. Only 21 buyers have rated it so far (4.1/5), so treat the score as an early read. Where it falls short: their 4.1/5 average sits under the 4.3 of our ranked picks. We'd pick it if you run one shower and the kitchen tap at once, rarely more; otherwise, put it next to the Rheem Prestige Condensing Natural Gas first.
Old tank out, unit on the wall, vent through the wall or the roof. a licensed pro handles it, and often a permit.
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.
January water comes in colder, so the same unit gives fewer GPM. Stagger the showers if you sized it tight.
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.
Buyers give it 4.1/5, a decent record, slightly below our ranked picks' 4.3 average. Only 21 reviews so far, and our formula damps averages built on fewer than 50.
Before the Noritz NRC71DVNG Condensing Natural Gas goes in your cart, check your winter flow: 7.1 GPM is a best case, so run your January numbers in our calculator first.
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.
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.
A condensing unit drips acidic water that needs a drain, often through a neutralizer. Our condensing guide explains the extra parts.
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 the Noritz NRC71DVNG Condensing Natural Gas stacks up against the closest alternative, the Rheem Prestige Condensing Natural Gas.
| Criterion | Noritz NRC71DVNG Condensing Natural Gas | Rheem Prestige Condensing Natural Gas |
|---|---|---|
| Our rating | 3.9/10 | 4.4/10 |
| Max flow | 7.1 GPM | 11 GPM |
| Fuel | Natural gas | Natural gas |
| Mounting | Indoor | Indoor |
| Buyer reviews | 21 · 4.1/5 | 27 · 3.3/5 |
Pick the Rheem Prestige Condensing Natural Gas if you want our higher-rated option (4.4/10), with more flow (11 GPM); stay with the Noritz NRC71DVNG Condensing Natural Gas for a higher buyer rating (4.1/5).
We rate it 3.9/10 (fair). It is based on 21 buyer reviews averaging 4.1/5 and the specifications stated in the listing.
The listing states a maximum flow of 7.1 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.
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.
Its listing states up to 7.1 GPM and a condensing heat exchanger. 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.
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.
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.
No, we haven't used it ourselves. Everything on this page comes from its listing and 21 buyer reviews, read line by line and weighed with our published formula.