Natural Gas Tankless Water Heater, Indoor Max 3.6 GPM, 80,000 BTU Instant Hot Water Heater
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Availability:
Only 5 left in stock, order soon!
Arrives
Aug 28 – Sep 20
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.
- 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
Product Dimensions: 19.09"W x 7.67"H
Color: Gray
Voltage: 120 Volts (AC)
Maximum Temperature: 149 Degrees Fahrenheit
Brand: Ranein
Product Dimensions: 19.09"W x 7.67"H
Color: Gray
Voltage: 120 Volts (AC)
Maximum Temperature: 149 Degrees Fahrenheit
Efficiency: [NI] Not Indicated
Mounting Type: Wall
Is Electric: No
Manufacturer: RANEIN
Item Weight: 22.9 pounds
Item model number: RH8K-NG
Included Components: Tankless Water Heater x1, Use’s Manual x1, Vent Pipe x1, Assembly Kit x1
Batteries Included?: No
Batteries Required?: No
Date First Available: May 31, 2023
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Aug 28 – Sep 20
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
Great product. It’s been 4 months or so since install and it’s working perfectly. Two showers+laundry+ 2 sinks running all at same time and keeps it at the temperature all day long. It heats up 75°F to 120°F in roughly 5-7secs. Super fast. Propane is really expensive here at Hawaii. This’ll save us a lot of money. One small thing is the installation instructions aren’t that great. And it didn’t come with the top bolt/screw thing it tells you to use to hook it on first. Just wall screws and anchor. Ended up not using it. Just bolted it to a 2x4 I installed on the wall. Much easier and more sturdy like this. Other than that installation is straight forward.
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Reviewed in the United States on July 14, 2025 by KK KK
Material Type: 4.3GPM 100,000BTU (Indoor)
Style: Natural Gas
Great price for what you get. Installation was easy. Like everything you buy, the heater doesn't come with everything you need. Every Installation will be different from application to application. I would suggest the Installation be done by a qualified technician/experienced plumber. There is no difference in water flow or pressure. The unit is fairly quiet during operating and silent when not in use. The water heats up very quickly within just 30 seconds to the tap. Shower was nice and hot the entire time. No fluctuations in temperature at all. Great upgrade to your home!!!
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Reviewed in the United States on July 24, 2025 by Erik Sager Erik Sager
Material Type: 4.3GPM 100,000BTU (Indoor)
Style: Natural Gas
Surprised. It works great in our 2-person home. It is reliable and isn't overly complicated. I had purchased a $1000 unit from Lowe's and it was so complicated, if you sneezed near it during installation, it would throw an error code. This one is less than half that price and is plug-and-play. It effortlessly supplies hot water to laundry/dishwasher and to someone in the shower simultaneously without issue. I own rentals and have purchased 4 of them now and will buy a 5th.
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Reviewed in the United States on July 10, 2025 by Maria Castleberry
Material Type: 3.6GPM 80,000BTU (Indoor)
Style: Propane
We have a really nice bathroom for a hipcamp operation but there was no practical way to get hot water to it. I was amazed at how many people took cold showers, so I set to solve that. This water heater is awesome it works very well, the showers are plenty hot, and we have a lot of happy campers. We raised the overnight stay rate from $28 to $34 / night and peopel are happy to pay a bit extra for a shower, and they stay longer. The small investment in the heater will pay off in the end. We had a leaky pressure relief valve. I tried all the customary fixes to stop the steady small drip, but sent a note to the compay. In the interim, I went to Home Depot, grabbed a new relief valve and installed it. I sent a copy of the invoice to the seller and they refunded the cost to our account. It's hard to beat that. All in all a good product for a fair price. We're very happy.
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Reviewed in the United States on July 25, 2025 by Thud
have had this for a year, after being replaced once, it still has this problem: when water pressure is low, or when you try to balance it for lukewarm water, it goes cold. also at low pressure, or being set to low pressure it also stays or goes cold. in the shower it will go cold if someone tries to use hot water at another station. has anyone else had this kind of problem? I'm going to call to see if warranty will cover it, but am really interested if anyone else has had this going cold problem.
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Reviewed in the United States on July 17, 2025 by Amy Revilla
So far so good. Takes a few minutes to get hot but is an acceptable time frame.
Reviewed in the United States on July 21, 2025 by Kindle Customer
Material Type: 3.6GPM 80,000BTU (Indoor)
Style: Natural Gas
Wow is all I can say ! Lowered my gas bill ! Takes up so little room. Easy to install. The only disadvantage is that it takes a minute to get hot water. The pluses out weigh the negatives
Reviewed in the United States on July 15, 2025 by Judy
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