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ORBEK Natural Gas Tankless Water Heater - Max 3.6 GPM 80,000 BTU Indoor Installation - CSA Certified On-Demand Instant Hot Water Heater 3/4" NPT Connector Size

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Availability: In Stock.
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Arrives Thursday, Jun 4
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Material Type: 3.6 GPM, Indoor Installation


Style: Natural Gas


Features

  • Endless On-Demand Hot WaterThe Orbek natural gas tankless water heater delivers 80,000 BTU capacity with 3.6 GPM high flow rate, featuring innovative 0.53GPM low-flow start technologyonly. It can provide a continuous supply of hot water to 2-3 outlets at the same time, making it suitable as a whole-house water heater or a practical gift for friends and family
  • Efficient & Energy-SavingThe highly efficient oxygen-free copper heat exchanger heats water rapidly, while a built-in chip intelligently adjusts the water temperature 20,000 times per second, keeping fluctuations within 1F to provide a stable and comfortable water flow. It also keeps stable combustion even at low flow rates, achieving efficient energy utilization
  • Certified Safety & ReliableThe gas tankless water heater indoor is CSA certified, meets stringent North American safety standards, and integrates multiple protections including anti-dry burning, anti-overheating, anti-leakage, anti-flameout, and anti-high water pressure. Whether showering, washing, or using water in the kitchen, you and your family can enjoy a stable supply of hot water with peace of mind
  • Easy Installation & UseThe gas tankless heater's compact design (20.5"H x 13.0"L x 7.0"W) blends seamlessly into homes, cottages, and apartments. The tankless water heater gas fits standard 3-inch exhaust pipe, 3/4-inch NPT connector, and 120V household power, it's designed for indoor installation only. We recommend professional installation to help you can enjoy reliable and comfortable hot water instantly
  • Convenient & Worry-freeA 2-year protection on the entire unit and a 5-year protection on the heat exchanger provide you with reliable support. The tankless water heater gas is equipped with a smart remote control and LED display, you can easily and precisely set the water temperature, and there's no need to reset it after a power outage. Its low-noise operation and energy-saving features create a quiet and worry-free home environment for you

Brand: Orbek


Capacity: 3.6 Gallons


Power Source: Natural Gas


Product Dimensions: 13"W x 20.5"H


Special Feature: 2 to 5 Years Warranty, 24/7 Customer Service, CSA Certified with Many Protections, Compact Design & Easy Installation, Energy Saving & High Efficiency See more


Brand: ‎Orbek


Product Dimensions: ‎13"W x 20.5"H


Special Feature: ‎2 to 5 Years Warranty, 24/7 Customer Service, CSA Certified with Many Protections, Compact Design & Easy Installation, Energy Saving & High Efficiency


Color: ‎White


Wattage: ‎25 Watt-hours


Voltage: ‎120 Volts (AC)


Maximum Flow Rate: ‎3.6 Gallons Per Minute


Maximum Temperature: ‎149 Degrees Fahrenheit


Heat Output: ‎80000 BTU per Hour per Foot per Degree Fahrenheit


Efficiency: ‎Included


Maximum Operating Pressure: ‎150 Pound per Square Inch


Mounting Type: ‎Wall


Is Electric: ‎No


Manufacturer: ‎Orbek


Item Depth: ‎7 inches


Item Weight: ‎25.9 pounds


Item model number: ‎HW080


Size: ‎3.6 GPM, Indoor Installation


Special Features: ‎2 to 5 Years Warranty, 24/7 Customer Service, CSA Certified with Many Protections, Compact Design & Easy Installation, Energy Saving & High Efficiency


Included Components: ‎Tankless Water Heater x 1 User's Manual x 2 (English and French Version) Quick Installation Poster x 1 Assembly Kit x 1


Batteries Included?: ‎No


Batteries Required?: ‎No


Warranty Description: ‎The entire unit is covered by a 2-year warranty, The heat exchanger is covered by a 5-year warranty


Date First Available: December 22, 2023


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Jun 4

This item is non-returnable:

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


  • Better than I expected water heater at a great price.
Material Type: 4.3GPM, Indoor Installation Style: Liquid Propane
So far working great, and one of the best things about it is that it turns on with minimal flow that my prior heaters of this gpm would not operate at. So we no longer need to have faucets at full blast just to get the heater to turn on. Also like that it had 3/4 sized water connections where as other heaters only do 1/2" size which limits flow especially when using plumbing like pex. The only negative is that it does take about a second longer to actually cut on once it detects flow compared to other heaters I have had, just makes it a bit longer to wait for hot water to start coming out. Otherwise, seems like a high quality heater, hopefully it will last without throwing error codes like I have had with these style heaters in the past. Keep in mind, these style of water heater do not need to mix with cold water like a traditional heater. You want to set the temperature to the hottest setting that you need out of the tap without mixing with cold water. then use the cold water to adjust down as needed. You do NOT need to set it to some high temp to then mix with cold water like you normally do with a tank in order to not run out of cold water in the shower. these are on demand so you will never run out. I see alot of reviews saying it cuts off when they mix it with cold water. likely they are having the temp up too high and mixing too much cold water with it causing the flow to drop down too much and causing it to cut off. this will happen with ANY of these tankless style water heaters. Especially in an RV where flow is often lower to begin with. ... show more
Reviewed in the United States on April 11, 2025 by Deshi!

  • Excellent customer service!
Material Type: 5.1 GPM, Outdoor Installation Style: Liquid Propane
I own two of their water heaters, one with electric heat and this one using propane. They were well supplied with parts and any owner supplied parts are easily obtained from Amazon or Lowes/HomeDepot. The propane unit sort of worked but was having issues and soon stopped to ignite at all. I contacted customer service and received a prompt reply. It was quickly determined by them to replace the unit and they sent a shipping label for the return paid by them. They were aware as soon as it was in the UPS system and shipped the new one. Regardless there was an issue, it can happen, it's the best customer service experience. The replacement unit was easily installed in 15-min and for several weeks now its working without issue. The electric unit has had no issues. I'm quite happy with the units and the company. I will note that the names Fogatti and Westinghouse appeared in service communications or on return label. ... show more
Reviewed in the United States on June 27, 2025 by Gary W Gary W

  • Ice cold shower? E8 code: how to make it work
Material Type: 4.3GPM, Indoor Installation Style: Liquid Propane
E8 code left cold showers increasing in frequency. Exhaust temperature increasing over time. Finally dropped to 30 seconds of hot water at a time. 2 months of use before it was thrown away. Last Japanese made hot water heater lasted 20 years. Unit works well after you program it. Installed correctly with 3" vent pipe you may see "E8" code displayed when you jump out of your ice cold shower. This is the Fan speed exceeding programmed maximum of '74' (no units displayed). 1. turn display off with power button, 2. unplug, 3. re-plug and after 2-3 seconds press the down arrow, 3. PP should appear on display, 4. press power button you will be in the programing parrameter list- use up arrow to navigate to Hc= fan speed, select by pressing power button, increase from 74 to 95 (max is 99), press the power button to exit to main menu, use up arrow to find QU (looks a lot like 9U because of poor pixelation). press power button to select, This saves the setting changes. press power again if you aren't back to the general temperature display. Now your shower will stay warm. :) ... show more
Reviewed in the United States on January 23, 2025 by Just make it camo

  • Fairly straightforward install. Heats very fast, easy controls
Material Type: 3.6 GPM, Indoor Installation Style: Liquid Propane
I’m excited this is my first tankless water heater. Was fairly straightforward to install. I had it done since I wasn’t the most experienced with plumbing lines. Got a feeling this propane heater is going to work wonders on my electric bill. Something’s I’ve found so far , system heats really fast but takes the lines about a minute to reach my outlet where I’m using the water shower, kitchen sink etc. once it’s there very hot. Did try reducing flow of water in shower and notice if you slow the gpm to much it does indeed shutdown and water gets cold. I’ve taken fairly long showers for me and water stays constantly hot. So far very happy. This will also keep me from having to use my 220 heater and it’s great for my supplemental/ backup solar which supports only 120v. ... show more
Reviewed in the United States on January 24, 2025 by Lee Simmons

  • Tankless hot water heater
Material Type: 4.3GPM, Indoor Installation Style: Natural Gas
The fittings that it takes to install this are expensive.
Reviewed in the United States on December 20, 2025 by Diane Peaton

  • Works at or above spec given my setup
Material Type: 3.6 GPM, Indoor Installation Style: Natural Gas
I bought this awhile ago but just installed it. I’ve only got a 1/2” gas line running about 90 feet from the meter @ just under .26 psi and the 80K BTU unit can handle 2 fixtures continuously which is 3.5 gpm. I’m in the yellow zone so it’s working at or slightly above the stated spec which is great. I’ve also got it set to 118 degrees which is above the factory setting of 107. If I try a 3rd fixture it still works but it drops the water temp to accommodate —it doesn’t shut down which is nice. It was easy to install as I had all the connections there and the integrated cord meant I didn’t have to wire a cord to it. Gas is tricky so unless you’ve got all your numbers and calcs done, it’s easy to be disappointed with the performance. All the numbers I quoted above are very important before trying a tankless and the reason I didn’t go with a lager unit. Be aware. So far so good now let’s see if it lasts. ... show more
Reviewed in the United States on September 10, 2025 by Krame

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