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Written from the listing and 12 buyer reviews, not from our own use · How we rate
The Noritz NR98SVNG Natural Gas keeps it simple: an indoor gas tankless heater with up to 7.5 GPM. Rated 6.5/10, it suits replacing a 40-gallon tank in a mid-size home.
| Brand | Noritz |
|---|---|
| Category | Gas tankless water heaters |
| Fuel | Natural gas |
| Stated mounting location | Indoor / outdoor |
| Stated maximum flow | 7.5 GPM |
| Buyer reviews | 12 · 4.0/5 |
| ASIN | B004NDGFIG |
Full listing title: Noritz NR98SVNG 7.5 GPM Indoor/Outdoor Tankless Natural Gas Water Heater
| Fuel | Natural GasFull listing title |
|---|---|
| Stated mounting location | Outdoor / IndoorFull listing title |
| Stated maximum flow | 7.5 GPMFull 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. At 2 GPM a shower (our calculator's figure), the headline means two showers and a kitchen tap, less when the water comes in cold.
What it has going for it
120 V plug. A gas unit still needs electricity for its fan and controls: plan an outlet within reach of where it hangs.
One at a time, plus the kitchen tap: 7.5 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 NR98SVNG Natural Gas listing names:
The installation manual has the last word on venting, gas line and clearances; your installer reads it before you order.
At the price on Sep 30, 2026, each GPM of stated maximum flow works out at about $242.08 (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 B004NDGFIG), 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.
Want the high-efficiency kind? The Rheem RTGH 8.4 GPM Natural Gas Indoor (7.3/10) is a condensing unit, per its listing.
Our take
The best thing about the Noritz NR98SVNG Natural Gas is up to 7.5 GPM. Only 12 buyers have rated it so far (4.0/5), so treat the score as an early read. Where it falls short: their 4.0/5 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 Rinnai RUCS75iN 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), and clean the inlet filter. Our flushing and descaling guide has the checklist.
Buyers give it 4.0/5, a decent record, below our ranked picks' 4.3 average. Only 12 reviews so far, and our formula damps averages built on fewer than 50.
Before the Noritz NR98SVNG Natural Gas goes in your cart, check your winter flow: 7.5 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.
It plugs into a 120 V outlet for its fan and controls, so plan one within reach of where it hangs.
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 NR98SVNG Natural Gas stacks up against the closest alternative, the Rinnai RUCS75iN Natural Gas.
| Criterion | Noritz NR98SVNG Natural Gas | Rinnai RUCS75iN Natural Gas |
|---|---|---|
| Our rating | 6.5/10 | 6.6/10 |
| Max flow | 7.5 GPM | 7.5 GPM |
| Fuel | Natural gas | Natural gas |
| Warranty | Not stated | 1 years |
| Buyer reviews | 12 · 4.0/5 | 91 · 4.4/5 |
Pick the Rinnai RUCS75iN Natural Gas if you want our higher-rated option (6.6/10), with a longer stated warranty (1 years) and a higher buyer rating (4.4/5).
We rate it 6.5/10 (good). The rating comes from its documented listing alone, as no customer-review record is captured yet.
The listing states a maximum flow of 7.5 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.
The listing says it can go either way. Which setup and which venting apply depends on the exact model and your local code, and a licensed gas installer confirms it.
Its listing states up to 7.5 GPM. 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. Power at the wall: it plugs into a 120 V outlet for its fan and controls, so plan one within reach of where it hangs. 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 12 buyer reviews, read line by line and weighed with our published formula.