Search  for anything...

Tankless Water Heater Natural Gas,4.21GPM 16L Indoor,Instant Hot Gas Water Heater, with Fahrenheit Digital Display,Multi-Protection (Black)

  • Based on 117 reviews
Condition: Used - Like New
Checking for inventory...

Notify me when this product is back in stock

$155.19 Why this price?
Save $114.80 was $269.99

Buy Now, Pay Later


As low as $25.87 / mo
  • – 6-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

This item is eligible for return within 30 days of receipt

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.


Availability: Unavailable
Fulfilled by Amazon
Available payment plans shown during checkout

Style: Natural Gas 16L


Features

  • Tankless Water Heater- Natural Gas water heater tankless Steady Steady Temperature Control with more safety protection such as flame failure device,anti-freezing protection,over heating protection,Just need 3.6PSI of water pressure,4.21gallons of hot water can be output per minute.The maximum temperature raise is 167F,Applicable only Natural Gas(LNG)
  • Efficient & Energey Saving-The 4.21 GPM Instant Natural Gas Water Heater ,Maximum power output 68000btu/hour,on-demand hot water for 2-3 points simultaneous water supply for bathroom,kitchen hot water demand, Natural Gas Water Heater exchanger and main burner are desinged with advanced combustion technology to decrease gas consumption and burning noise.
  • Quality Material-This of ours Water Heater Crafted from stainless steel, our Propane water heater exhibits high temperature resistance and corrosion resistance. It also features a built-in oxygen-free copper water tank, reduce heat loss ensuring a prolonged service life.with with LED smartdigital display effortlessly adjust the temperature between 86F-167F according to your preferences.
  • Easy Assemble and Use-Applied with standard 1/2" NPT water fitting and gas inlet, comes with 2.5" horizontal vent pipe for quick installation.Note: For normal operation, this product must be installed with proper ventilation and a smoke exhaust pipe.
  • Widely Application -Save over 50% of available space compared to tank water heater.for both bathroom and kitchen hot water demand. great for home,small cabins and remote apartments indoor installation. without the need to install an expansion tank,Note: In cold weather, if the water heater is not used for a long time, it is necessary to open the pressure relief valve to drain the residual water in the water heater.

Brand: forimo


Capacity: 16 Liters


Power Source: Natural Gas


Product Dimensions: 14.37"W x 4.72"H


Special Feature: Flame Failure Protection


Power Source: Natural Gas


Special Features: Flame Failure Protection


Wattage: 19.98 KW


Flow Rate: 4.21 Gallons Per Minute


Maximum Temperature: 167 Degrees Fahrenheit


Heat Output: 68000 British Thermal Units


Efficiency: Higher than conventional models


Mount Type: Wall


Is Electric: No


Color: Black


Style Name: Natural Gas 16L


Material Type: Copper, Stainless Steel


Capacity: 16 Liters


Item Dimensions W x H: 14.37"W x 4.72"H


Item Weight: 10.41 Kilograms


Brand Name: forimo


Model Number: Tankless Water Heater-01


Manufacturer: forimo


UPC: 717012462848


Included Components: Tankless Water Heater


Item Type Name: Tankless Water Heater


Frequently asked questions

This product is currently out of stock. Please check back later for shipping info.

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • Works great 👍
Style: Natural Gas 16L
Just installed today. Had to get a few adapters (on my end) but seems to be working perfectly so far. Pretty straight forward to install.
Reviewed in the United States on August 24, 2025 by SubsonicSAL

  • Very pleased so far
Style: Natural Gas 16L
I think I'm going to be quite pleased with this unit, though I've only been using it a couple of days so far. My main criterion for choosing this was it's dimensions (overall size and location of connections) and, of course, price. Though it has slightly less BTU output that the 10+ year old unit it's replacing, it has given me all the hot H2O that I need. AND, sort of a bonus for me was the auto-temp control, which regulates water and fuel flow to maintain the temperature you set it to. (My old one was manual where you had to estimate the two flows, and adjust seasonally sometimes) And, I think the flow sensor is more sensitive on this than my old one, though admittedly that one had grown insensitive over the years. I'll never go back to a tank, those are one step up from using a vat in the fireplace! ... show more
Reviewed in the United States on February 28, 2025 by BrizeBooks

  • Junk
Style: Natural Gas 16L
My first one did not work more than two weeks. Tried to contact the manufacturer and they only respond in the middle of the night after a week of getting nowhere I bought another and swapped out. This one worked for about 5 months before it stopped working automatically. In order for me to get hot water I have to manually turn it on every time. It's a piece of junk and the seller is not helpful in replying. ... show more
Reviewed in the United States on June 4, 2025 by Kristine

  • Works Great
Style: Natural Gas 16L
Thankless water heater work great has constant hot water just the way I like it. Instalation was a piece of Cake Takes a lot less space made for more Storage just have to keep a clear space around the Heater
Reviewed in the United States on January 14, 2025 by Steve P

  • Initial Reaction. Works well, fairly easy install. Great value
Style: Natural Gas 16L
I've only been using this for a couple of days, but I'm very impressed. This was an upgrade from my previous tankless, which I had to tinker with multiple time per year because it lacked a temperature setpoint. A 2.5" diameter exhaust pipe worked well for a 1 foot extension.
Reviewed in the United States on January 5, 2024 by David J.

  • Worth it
Style: Natural Gas 16L
Works great. As long as you have good water pressure. It has a pressure sensor that will not kick in with low pressure
Reviewed in the United States on November 7, 2025 by Weldon

  • Excellent
Style: Natural Gas 16L
Excellent easy to install and quick to have hot water
Reviewed in the United States on June 19, 2025 by Samuel

  • Unreliable and no warranty.
Style: Natural Gas 16L
This is a small unit, so heating capacity is limited. I cannot recommend the Forimo brand. There is no warranty, and communicating with Forimo is difficult because you are communicating with a person in China with the normal broken English. My first unit failed after just a few months. I replaced it with an identical unit so that I would not have to change any plumbing. So far, it is still going, but there was a scare recently when the flow sensor briefly quit responding, which kept it from coming on. ... show more
Reviewed in the United States on October 10, 2025 by birdman

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for inventory...