Eccotemp FVI12-LP Liquid Propane Gas Tankless Water Heaters, White

(9 customer reviews)

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Whole home indoor, gas powered tankless water heater, rated at 3.6 GPM that activates only when in use, making it an energy saver.

For indoor installation with safe, efficient power ventilation and perfect for any small home, cabin or apartment.

Easy to read digital temperature display, on a compact and space-saving design with minimal noise output.

Safe electronic ignition system; plugs into standard 120v electrical outlet with UL-listed cord.

Uses standard 1/2″ NPT water fittings and is equipped with easy to use manual water temperature controls.Minimum 0.65 GPM flow rate

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SKU: B002Y0K6AI Category:

Product information

Style:Liquid Propane

Technical Details

Additional Information

Warranty & Support

Product Warranty: For warranty information about this product, please click here. [PDF ]


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‎Eccotemp Systems

Part Number


Item Weight

‎33 pounds

Product Dimensions

‎25 x 14.5 x 4 inches

Item model number


Is Discontinued By Manufacturer



‎4.0 GPM




‎Liquid Propane




‎Alloy Steel



Power Source

‎Gas Powered


‎110 Volts

Installation Method


Item Package Quantity


Temperature Range

‎80-140 Degrees Fahrenheit

Flow Rate

‎4 Gallons Per Minute

Water Consumption

‎3.5 Gallons per Minute

Maximum Pressure

‎80 Pound per Square Inch

Display Style


Mounting Type






Included Components

‎FVI12-LP Tankless Water Heater, Horizontal Venting, Instruction Manual, Installation Hardware

Batteries Included?


Batteries Required?


Warranty Description

‎2 Year Limited Warranty





Customer Reviews

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Best Sellers Rank

#122,206 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement)#151 in Water Heaters

Date First Available

November 20, 2009

9 reviews for Eccotemp FVI12-LP Liquid Propane Gas Tankless Water Heaters, White

  1. September 15th Interests, LLC

    Wanted to wait a while until offering a review on this water heater. It’s been in my 29′ travel trailer for about 3 months now. It installed very easily. I suppose I understand why it’s not recommended for MY use, but, then again, I also understand how sue happy people can be over the stupidest things. That said, I am VERY happy with how this little beauty performs. Getting the water temperature right can be a bit fussy and take half a dozen uses before you get it dialed in, but it excels at delivering unlimited hot water in about 5 seconds to the furthest part of my trailer, and the shower is nearly instant (mounted in the bedroom next to the shower). It appears to “sip” propane, and doesn’t intrude into the limited space one has in a travel trailer. Heat from the unit is NOT an issue. I can nearly hold my hand on the vent pipe when it’s running, and it does not get hot enough to ignite anything due to the power venting. It’s very quiet, ignites instantly when it senses water flow. The fan continues to run for 5 or 10 seconds after the flame is stopped.If it holds up as well as it performs, it’s an absolute winner in my book.Should I encounter any issues, I’ll update this review.UPDATE: Still deserves 5 stars. It amazes me how little propane it uses. I started with a full 20 gal tank and STILL have about 3/4 of it remaining. During the warm weather, I had to lower both settings to account for the warmer water coming into the unit, which is really easy.UPDATE 7/7/17: Still super happy with this water heater and have had absolutely NO issues with it. Use it daily all year long and am STILL amazed at the way it sips propane but heats water well. The super easy adjustments make it easy to vary the temperature even day to day if needed. Would happily recommend this unit!

  2. Paul K. Zetlmaier

    I love Japanese baths. My outdoor tub had a wood fired heater for years and it finally sprung leaks.So far; heats 400 gallons to 112 f in about 3 hours ? (not measured) Faster than the wood stove and a lot less work.Circulation with a large aquarium pump works well I think if the heater is in a cabinet it will think it’s indoors. GOOD!

  3. Super Conqerors

    If you have LP and want a water heater that never runs out, this is amazing! Easy to install (if you are a plumber/HVAC competent individual) and very lightweight. The customer service from the company in response to our inquiries before purchasing this was quite knowledgeable as well.Keep in mind that you cannot run every single hot water appliance at the same time (dishes and bathing doesn’t work as well). It is much more efficient than the tank water heaters.

  4. Guy N.

    We live in a fully off grid home. We love this hot water tank. 140 degree water in seconds. We have zero low flow ignition issues. We utilize a 60 psi 6 gal per min 12 volt pump. (See pic) we had one issue out of the box. The brass drain valve on the bottom was leaking. A .79 cent O-ring replacement fixed that. I highly recommend this tank. I also found that customer service was responsive and made sure my questions were answered. Another thing, the temp controls are easy and hold true for us. Not sure why so many people are complaining about it. For the money it is a fantastic hot water tank.

  5. Amazon Customer

    Incredible, what else is there to say? We bought this water heater for our RV, and it has been a dream! We fulltime in our RV, and use it on a daily basis. The only time we have issues is when the water pressure is too low, not a fault of the heater. We read reviews that complained about the freezing issue, we mounted the unit on an inside wall perpendicular to the outside wall to where it was vented. This kept the coils away from the colder outside wall, and yes it got cold this winter, and we never had one issue with freezing.

  6. Jeffrey C. Dyrek

    I gave this product a five star review BUT READ THIS FIRST. The product worked absolutely fantastic. However, after I left the basement door open when the outside temp was -10 degrees F. the system exploded. It was a violent explosion and caused a lot of damage to my plumbing and water well system. There was no over temp or over pressure safety cutoff on the system and this makes it dangerous. If someone was in the basement when this explosion happened, they would be seriously injured. I have reordered the system because it was a tremendous energy saver and it worked great. It is also a huge space saver too over the old hot water system. So BE ADVISED that there is a danger in the system and this unit does not meet safety requirements for freezing situations. C. Jeff Dyrek, Webmaster, Arctic Explorer, Disabled Vet.

  7. Louise

    I have used on-demand water heaters since the mid-1980s, always the Bosch Aquastar. Moving into a small, green house, and having had some issues with our last Aquastar that was confounded by incoming water that was too hot in the summer to trip the heater to action (water that was too cold for a shower), we decided to spend about 1/3 the money and try this one. It is considerably more controllable than the Bosch thanks to the gas level and temperature controls. We have experienced no issues of water temperature drop due to two using it at the same time. Nor have we had any need for more venting as others have. We installed it in the first-floor bath and vented it straight out the wall with the included materials. It has been a workhorse. No leaks. No issues. A keeper. At least so far: It has been installed for about six months. My Bosch heaters were also loved but this one is better, at least so far. And it is much smaller and easier to install, to boot. Plus, you don’t have to spend $200 on vent pipes!

  8. L. J. Zinkand

    We recently has this unit installed and so far, it’s been great. You have to understand that making the shift from an old trusty, electricity-hogging water heater to propane-powered hot water on demand has a bit of a learning curve. You need to tweak the controls to your preferences and understand that the sink farthest away will take a little longer to get hot water than the one closest to the unit. We are just two people living in a cottage, so we got this smaller unit for now and it seems to be doing its job very well for us.We had a couple of questions during installation and when I emailed Eccotemp, they answered within 5 minutes. Then we had a question later on a Friday afternoon and I figured we wouldn’t hear back till Monday, and guess what? A man named Shawn from Eccotemp called us on SATURDAY MORNING to make sure that we’d solved our dilemma. (We had, but still – wow!)

  9. Arona

    I bought one of these 2 years ago. It’s wonderful. Been running like a champ since then. I even have it partially exposed wind and rain (dumb) and it’s been fine(I really need to build a little roof over it, but right now it’s just protected by the eve of my house, not directly facing the wind but it gets glanced)This is why i STRONGLY support this product. I personally don’t trust a lot of 5-star ratings on Amazon cause they sound fake, but I’m an actual person who owns this water heater.The only con about this water heater is that i don’t get enough pressure in my water line to be able to adjust the water in the shower by mixing cold water with the hot, i have to actually adjust the amount of gas flow (the left knob) to adjust the water temp while showering. If i try to run cold water while the heater is trying to get enough water to function, it shuts off. Maybe you’ll have enough water supply for the demand. I think my neighbor, the guy i get the water from, has a pressure reducing regulator at the source because he’s afraid of the line bursting or getting holes from too much pressure.So to make up for this minor inconvenience, glued a plastic-coated steel wire around the knob (only tacked to it with wire going partially around top and bottom like a pulley), so in the shower you pull either the top or bottom string to adjust hot/cold. (The shower and water heater and lined up side by side but at a distance)I recently bought another one of these for my guest cabin and since it’s under an enclosure, i just made a hole in the privacy divide where the person can reach through and turn the knob by hand. Much easier. Again, this is mounted outside, but this time with a roof overhead and 3 walls.When i first bought this thing i didn’t have the right pressure regulator for the propane tank. I had one for gas grills that was way too much pressure, but other ones for gas grills are actually low pressure. You need a low pressure one. I think this unit needs less than 1/4psi, max i think 1/2psi or something. You gotta read it in the manual. So i called Eccotemp. They’re a small outfit but EXTREMELY HELPFUL, and we eventually figured out why i was getting a E3 error reading having to do with the gas. They offered to send me a new computer or something and sounded like they were going to do it right away. But i got the engineer or someone’s e-mail and he informed me about the pressure since i had mentioned bbq grill etc.All in all, this thing rocks!!!

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