The 5 tankless heaters we'd put in for the morning rushTop 5 tankless heaters → See the ranking
Compare models
Novieex 100,000 BTU Propane Indoor

Product images: Amazon listings

Novieex 100,000 BTU Propane Indoor Review

7.2Good · 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

On paper, the Novieex 100,000 BTU Propane Indoor gets the important things right: a 4.3 GPM maximum flow and a ±1 °F temperature hold. It suits a cabin, a garage apartment or an in-law suite, and its sibling listing, the Novieex 120,000 BTU Propane Outdoor, holds #5 in our outdoor propane tankless water heater ranking.

Variants of this model

These are sold as variants of one listing family. Each variant has its own page.

Price$269.98Price on Sep 30, 2026 · may have changed
Check the price on Amazon ↗ Novieex 100,000 BTU Propane Indoor (opens in a new tab)Affiliate link · price and stock on Amazon
Compare side by side ↗
Specifications
BrandNovieex
CategoryGas tankless water heaters
FuelPropane
Stated mounting locationIndoor
Stated maximum flow4.3 GPM
Stated gas input100,000 BTU/h
Stated voltage110 V
Temperature range95 to 149 °F
Temperature hold±1 °F, per the listing
Water pressureFrom 1.5 PSI
Stated warranty1 years
ASINB0GY4LVD28

Full listing title: Novieex Propane Gas Tankless Water Heater Up to 4.3 GPM 100,000 BTU, Indoor

Listing evidence
FuelPropane Full listing title
Stated mounting locationIndoor Full listing title
Stated maximum flow4.3 GPM Full listing title
Stated gas input100,000 BTU Full listing title
Stated voltage110V Listing text
Updated October 2026
Exact listing, ASIN B0GY4LVD28
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 ↗

Novieex 100,000 BTU Propane Indoor

Novieex 100,000 BTU Propane Indoor

7.2Good · out of 10$269.98 Price on Sep 30, 2026 · may have changed
  • Stated: 4.3 GPM · 100,000 BTU/h · 110 V
  • Gas tankless water heaters
This product ↑
Ranein 80,000 BTU Propane Indoor

Ranein 80,000 BTU Propane Indoor

7.1Good · out of 10$299 Price on Sep 30, 2026 · may have changed
  • Stated: 3.6 GPM · 80,000 BTU/h
  • Gas tankless water heaters
See the review ↗
APUS 95,000 BTU Propane Indoor

APUS 95,000 BTU Propane Indoor

7.4Good · out of 10$299.99 Price on Sep 30, 2026 · may have changed
  • Stated: 4.42 GPM · 95,000 BTU/h · 120 V
  • Gas tankless water heaters
See the review ↗

Up to 4.3 GPM from a 100,000 BTU burner

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. Counting 2 GPM per shower, as our calculator does, that's one shower at a time.

What it has going for it

What changes in the morning shower rush

±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.

95 to 149 °F. The setpoint range per the listing. Above 120 °F at the tap is scalding territory for kids, so most homes set it lower.

One shower at a time, or two?

One at a time: that's what 4.3 GPM is for.

Two at once: not with this one. Look at the bigger units further down this page.

Great for you if…

  • A shower that suddenly runs cold drives you mad

Skip it if…

  • Two showers often run at once in your house: 4.3 GPM is a one-shower unit
  • You'd rather wait for buyer reviews: none are captured for this listing yet
  • You want the high-efficiency kind: the listing doesn't call it condensing

Gas, venting and what's in the box

What the Novieex 100,000 BTU Propane Indoor listing names:

  • Up to 4.3 GPM
  • 100,000 BTU/h input
  • Propane
  • Indoor mounting
  • Starts from 1.5 PSI
  • ±1 °F temperature hold claimed
  • 95 to 149 °F setpoint

Warranty & support: 1-year warranty, as stated in the listing.

That is the maker's promise, not ours. Keep the invoice, register the Novieex 100,000 BTU Propane Indoor if the maker asks, and read the install conditions: many tankless warranties need a licensed install and regular flushing.

For the Novieex 100,000 BTU Propane Indoor, the installation manual settles the venting, the gas line and the clearances.

Novieex 100,000 BTU Propane Indoor, view 3

Price and cost per GPM of stated flow

$269.98 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 $62.79 (price ÷ stated GPM, our arithmetic). That puts it in the cheaper 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 B0GY4LVD28), where today's price, stock and seller apply. Sizes and variants of the same family often sit at different prices.

Novieex 100,000 BTU Propane Indoor, view 4

A better fit for your house?

Two showers and the dishwasher at once? The Ranein 190,000 BTU Natural Gas Indoor (7.9/10) states up to 8.5 GPM.

No easy route for a vent pipe? The Westinghouse 120,000 BTU Propane Outdoor (7.6/10) mounts on an outside wall, per its listing.

Want the high-efficiency kind? The Ranein Condensing Propane, 5.1 GPM (7.4/10) is a condensing unit, per its listing.

Our take

The verdict

Our favourite thing about the Novieex 100,000 BTU Propane Indoor is a 4.3 GPM maximum flow, closely followed by a ±1 °F temperature hold. No buyer reviews yet, so the Novieex 100,000 BTU Propane Indoor has to win you over on paper. The catch with this Novieex indoor gas tankless heater: the headline GPM is a mild-weather figure, so leave yourself margin for January. We'd pick it if a shower that suddenly runs cold drives you mad; otherwise, put it next to the Rheem RTGH 8.4 GPM Natural Gas Indoor first.

Check the price on Amazon ↗ Novieex 100,000 BTU Propane Indoor (opens in a new tab)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 100,000 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. 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), and clean the inlet filter. Our flushing and descaling guide has the checklist.

The one thing we'd check first

Before you order the Novieex 100,000 BTU Propane Indoor, check your gas line: 100,000 BTU/h is a lot of gas at once, so ask your plumber whether the existing line can feed it.

Before you buy

Your winter flow

4.3 GPM is the headline. In a northern January the water comes in near 42 °F, so a 105 °F shower needs a 63 °F rise and the real flow drops. Our flow-rate calculator runs the numbers for your house.

Vent and gas line

Ask the plumber to check the gas line size and the meter against the heater's input, and to quote the vent route at the same visit. Our install cost guide shows what that usually adds.

The warranty terms

1 years are stated. Read what it requires: a licensed install, the gas type and regular flushing are the usual conditions.

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 Novieex 100,000 BTU Propane Indoor stacks up against the closest alternative, the Rheem RTGH 8.4 GPM Natural Gas Indoor.

CriterionNovieex 100,000 BTU Propane IndoorRheem RTGH 8.4 GPM Natural Gas Indoor
Our rating7.2/107.3/10
Max flow4.3 GPM8.4 GPM
Gas input100,000 BTU/h157,000 BTU/h
EfficiencyNot statedCondensing
Warranty1 years15 years (heat exchanger)
Buyer reviewsNone captured60 · 4.4/5

Pick the Rheem RTGH 8.4 GPM Natural Gas Indoor if you want our higher-rated option (7.3/10), with more flow (8.4 GPM) and a bigger burner (157,000 BTU/h).

Compare side by side ↗See the Rheem RTGH 8.4 GPM 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

3 / 10

Listing documentation

8 / 10

Fit & compatibility

7 / 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 Novieex 100,000 BTU Propane Indoor any good?

We rate it 7.2/10 (good). The rating comes from its documented listing alone, as no customer-review record is captured yet.

How much hot water can the Novieex 100,000 BTU Propane Indoor deliver?

The listing states a maximum flow of 4.3 GPM and a gas input of 100,000 BTU/h on 110 V. 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 Novieex 100,000 BTU 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 Novieex 100,000 BTU Propane Indoor?

Its listing states up to 4.3 GPM and temperature held within ±1 °F. 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 Novieex 100,000 BTU Propane Indoor?

Your winter flow: 4.3 GPM is the headline. In a northern January the water comes in near 42 °F, so a 105 °F shower needs a 63 °F rise and the real flow drops. Our flow-rate calculator runs the numbers for your house. Vent and gas line: ask the plumber to check the gas line size and the meter against the heater's input, and to quote the vent route at the same visit. Our install cost guide shows what that usually adds. The warranty terms: 1 years are stated. Read what it requires: a licensed install, the gas type and regular flushing are the usual conditions. 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 Novieex 100,000 BTU 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 Novieex 100,000 BTU 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.

Gas tankless water heaters ↗All Novieex productsComparison toolAll product reviews