Product images: Amazon listings
Written from the listing's specs, not from our own use · How we rate
The Ranein 190,000 BTU Propane Indoor keeps it simple: an indoor gas tankless heater with an 8.5 GPM maximum flow. It suits replacing a 40-gallon tank in a mid-size home, and its sibling listing, the Ranein 190,000 BTU Natural Gas Indoor, holds #2 in our indoor natural gas tankless water heater ranking.
These are sold as variants of one listing family. Each variant has its own page.
| Brand | Ranein |
|---|---|
| Category | Gas tankless water heaters |
| Fuel | Propane |
| Stated mounting location | Indoor |
| Stated maximum flow | 8.5 GPM |
| Stated gas input | 190,000 BTU/h |
| Stated warranty | 2 years |
| ASIN | B0GJFMHRTJ |
Full listing title: Ranein Propane Gas Tankless Water Heater, 8.5 GPM, 190,000 BTU, Indoor
| Fuel | PropaneFull listing title |
|---|---|
| Stated mounting location | IndoorFull listing title |
| Stated maximum flow | 8.5 GPMFull listing title |
| Stated gas input | 190,000 BTUFull listing title |
Rated from the listing's specs, no buyer reviews yet
What it's made for: replacing a 40-gallon tank in a mid-size home.
Two gas tankless heaters on propane 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. 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 two showers and a kitchen tap, less when the water comes in cold.
Two at once: up to 8.5 GPM, and our calculator counts a shower at 2 GPM, so that's two showers and a tap on paper. The January answer is in the flow chart, on the 63 °F rise line.
One at a time: you'd be paying for burner, gas line and vent you never use. A smaller unit is the cheaper answer.
The seller states, word for word, in the Ranein 190,000 BTU Propane Indoor listing:
Uses standard 3/4" NPT water inlet fittings and air inlets for quick installation.
It is suitable for 4-6 outlet points.
The seller's claims, quoted as written; we haven't measured any of it. The flow at your winter rise is in the maker's chart, not in the bullet points.
What the Ranein 190,000 BTU Propane Indoor listing names:
Warranty & support: 2-year warranty, as stated in the listing.
That is the maker's promise, not ours. Keep the invoice, register the Ranein 190,000 BTU Propane Indoor if the maker asks, and read the install conditions: many tankless warranties need a licensed install and regular flushing.
For the Ranein 190,000 BTU Propane Indoor, the installation manual settles the venting, the gas line and the clearances.
At the price on Sep 30, 2026, each GPM of stated maximum flow works out at about $82.24 (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.
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 B0GJFMHRTJ), where today's price, stock and seller apply. Sizes and variants of the same family often sit at different prices.
Two showers and the dishwasher at once? The Rinnai RU199iN Condensing (7.8/10) states up to 11 GPM.
No easy route for a vent pipe? The APUS 190,000 BTU Propane Outdoor (6.9/10) mounts on an outside wall, per its listing.
Want the high-efficiency kind? The Rheem RTGH 9.5 GPM Propane Indoor (7.8/10) is a condensing unit, per its listing.
Our take
The Ranein 190,000 BTU Propane Indoor is about an 8.5 GPM maximum flow, and it doesn't pretend to be more. No buyer reviews yet, so the Ranein 190,000 BTU Propane Indoor has to win you over on paper. The catch with this Ranein indoor gas tankless heater: no stated temperature hold, while most picks here claim ±1 °F. We'd pick it if you run one shower and the kitchen tap at once, rarely more; otherwise, put it next to the Eccotemp i12-LP Propane Indoor first.
Old tank out, unit on the wall, vent through the wall or the roof. Plan the gas line for 190,000 BTU/h; 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.
Before the Ranein 190,000 BTU Propane Indoor goes in your cart, check your gas line: 190,000 BTU/h is a lot of gas at once, so ask your plumber whether the existing line can feed it.
8.5 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.
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.
2 years are stated. Read what it requires: a licensed install, the gas type and regular flushing are the usual conditions.
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 Ranein 190,000 BTU Propane Indoor stacks up against the closest alternative, the Eccotemp i12-LP Propane Indoor.
| Criterion | Ranein 190,000 BTU Propane Indoor | Eccotemp i12-LP Propane Indoor |
|---|---|---|
| Our rating | 6.9/10 | 6.9/10 |
| Max flow | 8.5 GPM | Not stated |
| Gas input | 190,000 BTU/h | Not stated |
| Warranty | 2 years | Not stated |
Both score 6.9/10. The Ranein 190,000 BTU Propane Indoor brings more flow (8.5 GPM) and a bigger burner (190,000 BTU/h), so it has the edge on paper.
We rate it 6.9/10 (good). The rating comes from its documented listing alone, as no customer-review record is captured yet.
The listing states a maximum flow of 8.5 GPM and a gas input of 190,000 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.
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 8.5 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: 8.5 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: 2 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.
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, read line by line and weighed with our published formula.