Ranein Natural Gas Tankless Water Heater, Indoor Max 3.6 GPM, 80,000 BTU Instant Hot Water Heater
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Availability:
In Stock.
Arrives
Thursday, Mar 19
Material Type: 3.6GPM 80,000BTU (Indoor)
Style: Natural Gas
Features
- Performance: The on-demand tankless water heater boasts a heating capacity of 80,000 BTU and a hot water flow rate of 3.6 gallons per minute (GPM). It can provide continuous hot water for 2-3 water supply points, making it sufficient to meet the hot water needs of a household's bathroom, kitchen, and bar area.
- No Waiting Required: Unlike traditional tank water heaters, tankless water heaters eliminate the need for a 30-minute preheating wait time, allowing you to have unlimited hot water on demand. The tankless water heater cannot be installed in storeroom, basement, closet or balcony.
- Provides 4 modes: Dish mode(100F), Fruit mode(95F), Elderly mode(104F) and Infant mode(107F). More convenient for you to use.
- Recommendation: We strongly advise that all installations of the device adhere to local building and plumbing regulations at the installation location, and should be carried out by licensed professionals.(Not recommended for areas over 2,000 feet)
Brand: Ranein
Capacity: 3.6 Gallons
Power Source: Natural Gas
Product Dimensions: 13.8"W x 21.7"H
Special Feature: LED Display
Brand: Ranein
Product Dimensions: 13.8"W x 21.7"H
Special Feature: LED Display
Color: Gray
Voltage: 120 Volts (AC)
Maximum Flow Rate: 3.6 Gallons Per Minute
Heat Output: 80000 British Thermal Units
Style: Natural Gas
Mounting Type: Wall
Is Electric: No
Manufacturer: Ranein
Item Weight: 18 pounds
Item model number: RH8K-NG
Special Features: LED Display
Included Components: Assembly Kit x1, Tankless Water Heater x1, Use’s Manual x1, Vent Pipe x1
Batteries Included?: No
Batteries Required?: No
Warranty Description: 2 Year Manufacturer
Date First Available: May 31, 2023
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Mar 19
This item is non-returnable:
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
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Top Amazon Reviews
Material Type: 3.6GPM 80,000BTU (Indoor)
Style: Propane
My twenty year old 40 gallon (traditional) hot water heater finally sprung a massive leak, leading me to research LPG heaters that were available. My recollection is that the heater cost around $300 in 2005. The local big box hardware chains had heaters that began around 800 and seemed to accelerate from there. Since I live by myself, this seemed to be overkill, when I had the bright idea to look at tankless heaters. The chains had some that were even more expensive. Then, I checked Amazon. I found this 3.8 gpm / 80000 BTU heater on a black Friday price of $239, with a minor delay in delivery. For the price difference, I thought I would give it a try. I also ordered a HYDRO MASTER Tankless Water Heater Service Valve Kit (62.46) to provide fittings for the water connections. I waited a couple more days for my friend (Thank you, Andrew) to assist me in mounting and plumbing the unit in. His expertise, while not absolutely necessary, allowed me a two hour installation, with no leaks. He helped me determine additional parts necessary (PEX fittings, PEX hose, exhaust pipe and couplings available locally (around $120). (One caveat: when attaching the water valves to the unit, use teflon tape and teflon paste to seal. Do not apply too much torque when installing, it can be difficult to counter hold the connection.) All plumbed up, turned on the cold and hot water valves, plugged in the electric, turned on the LPG, no leaks. turned on the hot water spigot and the unit fired right up, I could not have asked for a better outcome. I noted on the outside of the cover, the date of purchase and the 1 year warranty. We'll see how long it lasts.
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Reviewed in the United States on December 9, 2025 by The Guy Who Owns Fast Cars
Material Type: 4.3GPM 100,000BTU (Indoor)
Style: Propane
The media could not be loaded. 2nd edit!—— it’s been almost a year and want to say through the winter I was almost certain it was going to be broken with the water frozen even inside the house, we had issues with the gas company (propane) blot being able to come fill so we went without heat off and on all winter, we ended up just filling a 100lb cylinder every 2 days 😳 it was expensive. But during the times we didn’t have heat and inside froze my fridge broke, (water and ice don’t work) all shut offs busted when we got heat and water thawed. But the shut offs to this didn’t! And it didn’t break! We’re still going strong and still working properly 🙌🏻 Editing to update, it’s now been about 3 months and I love this so much! Bills went down about 100$ and it’s just perfect! I got this about 3/4 weeks ago it’s been installed 3 weeks or so. My dad installed and I was helping. It was easy to install and hook up. The packaging comes with everything basically, you need to hook up. I’m pretty sure we had to buy the shut offs. But either way it’s cheap and works great. I have 5 kids almost 6-11 years old plus 3 adults. So far no problems with it heating and keeping temperatures. It’s quiet and definitely space saving!!! So now I can use the bathroom closet instead of having a big tank taking up all the space. This is the propane not natural gas. Sorry for the long video review but wanted to let people to know some details cause I was hesitant my own self after reading some of the reviews. Questions for will it work or not work cause I was told by Lowe’s a few years ago I need a 9-11gpm for the people I have in household. It’s actually by faucets and the rating they have and how many you have and want running at the same time. So I bought all my fancy faucets (waterfall, rain shower head) etc from Amazon as well and they do take a good bit of water output so I just checked the output and f it, let’s give this a try. My main concerns was the reviews like “I got propane but it won’t work it’s only for natural gas” or “it leaks upon installation or after a few days” I’ve had it for almost 3 weeks and it’s been good to us no leaks nothing. I’d definitely recommend this tankless heater
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Reviewed in the United States on August 23, 2024 by Jessica williams
Material Type: 3.6GPM 80,000BTU (Indoor)
Style: Propane
The water heater works very well. It is small enough it does not take up very much space in our tiny home. We have hot hot water most of the year but once the coldest days of winter get here you have to slow the water down coming in so it can heat it sufficiently. The heater is very durable offers excellent water heating quality. We only have to slow down the incoming water for showers, sinks work fine full flow and I haven’t checked the washer but we have had it a year with no issues and we do have 11 people in our house.
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Reviewed in the United States on January 12, 2026 by Amanda Turner
Material Type: 4.3GPM 100,000BTU (Indoor)
Style: Propane
The media could not be loaded. Lasted about 6 months before the unit started leaking water so bad I had to disconnect the water supply. Wrote to the company and was told parts would be shipped to me because apparently I am a hot water repair man now. After about two weeks of waiting I decided to contact the company again and was told my package was seized at customs. Yeah that makes sense to me. Why would some hot water heater parts be seized. After another email (third one now) I have heard nothing but crickets. Now I am nearing the end of a third week of taking cold showers and honestly it's unacceptable. Since the company has no intention or interest in honoring the supposed "2 year warranty" they claim to have it seems like I am left with the options to repair it myself which isn't really an option now is it or buy a new water heater from a company that doesn't treat their customers like this. Sure the price looks good but hmmmm now I can see why it was a good price. I would compare this company's products to harbor freight quality but harbor freight quality is actually better than the junk this company is peddling. So do what I didn't do and pay the extra money for the name brand options because three weeks of cold showers will make you rethink some life choices.
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Reviewed in the United States on January 30, 2026 by Alex