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
Tuesday, Nov 25
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 Flow Rate: 3.6 Gallons Per Minute
Brand: Ranein
Product Dimensions: 19.09"W x 7.67"H
Color: Gray
Voltage: 120 Volts (AC)
Maximum Flow Rate: 3.6 Gallons Per Minute
Maximum Temperature: 149 Degrees Fahrenheit
Mounting Type: Wall
Is Electric: No
Manufacturer: RANEIN
Item Weight: 22.8 pounds
Item model number: RH8K-NG
Included Components: Assembly Kit x1, Tankless Water Heater x1, Use’s Manual x1, Vent Pipe 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:
Tuesday, Nov 25
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
I purchased this a year ago and got around to installing it in late August. Living in south Alabama, I figured this would work well for our home. For what it does, and the price of the heater, I’m very pleased. Tonight is the coldest that the water heater has seen. The water coming in was 62 degrees. The output was 127 with the thermostat set at 149. Two important things to note: 1) I have a ball valve in-line at the outlet and it is throttled back a little over half way. 2) I have a well so I don’t take showers because of the inconsistent water pressure (cut-in set at 40 psi, cut-out at 60 psi). Once I install a pressure regulator, showers will be okay. I’m giving it 5 stars because it does work, it has been cheaper to operate than the electric tank water heater that I’ve had, and it is very affordable. From September 1 through today, we’ve not used but about 8 gallons of LPG to heat water for my wife, myself, and grandkids. If you’re considering this, do be aware that 3.8GPM isn’t much water. I miscalculated the volume of water from this old well pump. In my own experience in process control, it was easy enough to regulate the temperature by throttling the output of the heater to get the desired water temp/flow rate through. So, be forewarned, if you don’t have low volume water, you may need additional throttling to slow the water down through the heat exchanger. I installed it myself within about 40 minutes. Very easy to install, however, at one point we did have LPG tank heater installed so the existing exhaust vent was used. This heater mated up perfectly with the existing exhaust stack so that was extremely beneficial.
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Reviewed in the United States on November 11, 2025 by X3n0N907 X3n0N907
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: 4.3GPM 100,000BTU (Indoor)
Style: Propane
We were in need of a new water heater! This one works so good , awesome product. Water gets hot quickly and it’s a quiet water heater. You almost can’t hear it running.
Reviewed in the United States on November 12, 2025 by Natalie Swinney
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
Ive been pleasantly surprised with this unit. It’s lightweight, easy to install(assuming all your connections are close by. My only hang ups are the fact that when there is no power, regardless of whether or not you bought a gas heater, you have no hot water because of the igniter and electrical panel on the unit run on electricity. The other only issue I have had after my one year of daily use and abuse, is that the unit keeps reverting back to Celsius. I just stopped resetting g it because it got so annoying. It’s durable and functions perfectly. And my natural gas bill went from $40ish to $15ish per month. I couldn’t be happier about that.
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Reviewed in the United States on September 14, 2025 by John
Material Type: 4.3GPM 100,000BTU (Indoor)
Style: Natural Gas
I have been using water heater for over a month now no issues works perfect. easy to install
Reviewed in the United States on November 6, 2025 by Alan Johnston
Material Type: 4.3GPM 100,000BTU (Indoor)
Style: Natural Gas
This is one of my purchases on Amazon that I was skeptical about. I purchased a couch and I got all these good reviews and then I didn’t get the couch but this hot water tank did not disappoint. It came with what I needed it. The company was supportive and what we didn’t have what we needed to do. It is a win win win, and let me say that the Customer service on this is excellent. The people called us back. They responded to our questions helped us through and it was a win.
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Reviewed in the United States on November 6, 2025 by Sharlene Gamble
Material Type: 3.6GPM 80,000BTU (Indoor)
Style: Propane
Great upgrade from our last tankless hot water heater and it didn’t break the bank. The heated water is more consistent and steady than my last heater. Looks great and works even better!
Reviewed in the United States on October 22, 2025 by jennifercornish