Eccotemp 6.3 GPM Natural Gas Indoor Tankless Water Heater

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Eccotemp 6.3 GPM Natural Gas Indoor Tankless Water Heater

Overall Rating Rating 4.2  |  25 reviews  |  Write a review
Today $429.00
Item #: 11572393
    You will love how easy it is to manage this indoor natural gas tankless hot water heater once it's installed. You can expect to save 20 to 40 percent off your gas bill, and the built-in temperature display offers plenty of regulation control. ...more

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Sponsored Links What's This?
    • Eccotemp natural gas indoor, tankless water heater saves 20-40-percent off your gas bill
    • Heater is ideal choice for three bedroom, two bath home
    • Maximum BTU 137,500 BTU's, minimum BTU 19,000
    • Energy factor of 0.80, recovery factor 0.84
    • Antifreeze circuit good to -30 degrees F
    • Temperature range from 90-140 degrees F
    • Internal pressure relief valve
    • GFI cord
    • Built in digital temperature display
    • Electronic ignition
    • Forced vent
    • 120 volt plug-in
    • 0.75-inch gas inlet
    • 0.5-inch water inlet/outlet
    • Measurements: 28 inches high x 14 inches wide x 8 inches deep
    Note: Does need category III stainless steel vent kit product number 2ZVWE03

    Click here to view venting requirement information for this item.
28H x 14W x 8Deep
10 year Limited Manufacturer
Copper, Metal, Electronics, Plastic
Model No:
Brand: Eccotemp


  • Material
  • Product Features
    Variable Temperature Control
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Showing 5 most helpful reviews on this product.

  • 5 Stars 15
  • 4 Stars 5
  • 3 Stars 3
  • 2 Stars 0
  • 1 Stars 2
  • Wow!

    All I can say is, "Wow!"... This water heater is great. I purchased my house in 2008 and the old water heater has been in this home since 1990. About 4 weeks ago, I needed to replace a faucet in the laundry room. I turned off the old water heater and shut off the water supply to the house. When I replaced the faucet and turned the water back on, the 21 year old beast sprung a leak.... dripping water at a moderate rate into the drain pan beneath it (thankfully, there was a pan installed!). After doing a decent amount of research online, I found out that my gas company has a rebate program for customers who upgrade their water heater to a more efficient model. The more efficient the heater, the bigger the rebate (up to $450). I began hunting around my local big-box home improvement stores (**** and ****) to see what they had to offer. To my dismay, their cheapest models were not efficient enough to qualify for a rebate (I needed an "energy factor" of at least .63). And the models with the higher efficiencies cost over $1000!! Needless to say, I hightailed it back home to see what the various internet retailers had to offer. The prices online were certainly easier to stomach, but the shipping from a lot of them was exhorbitant (especially the tank-style monstrosities). I found a few sellers on **** selling some strange chinese-brand of tankless heater for around $400, but I was concerned about using **** for such an important purchase. What if the water heater was defective? Or sprung a leak? No... I wanted a reputable vendor selling a decent brand. That's when I saw the Eccotemp on Overstock. At first, I thought it was too good to be true. A price under ***, with $3 shipping?? After reading a bunch of review, I decided to pull the trigger. Overstock only had a few left, and I really wanted to take a hot shower! After paying for the water heater, I expected to wait AT LEAST a week for it to arrive... but lo and behold, it came in THREE DAYS! Talk about fast service! I was absolutely thrilled! I've never installed a water heater, and after a lot of planning, trips to **** for parts, screaming and bruised knuckles, I managed to get the old water heater out and the Eccotemp plumbed up to the old piping. It works great! On demand, endless hot water. No wasted energy heating 40 gallons of water just sitting in a tank! It has an energy factor of .80! I can easily change the temperature of the water using the digital controls. It's so small, I have more room in my utility closet for my lawn and garden tools! And to top it all off, my gas company sent me a check fours days later for the FULL AMOUNT of my purchase... so basically, it was "FREE"! (I still had to pay for all the parts, including the gas line, pressure relief valve, copper pipes, flexible water lines, exhaust pipe, etc). Mind you, installation is not for the meek. But, with the right prep, any homeowner comfortable with hand tools and some basic plumbing can install one. I didn't even use solder, instead opting to use a special "copper epoxy" specially made for plumbing copper.

    • Did the color match the color displayed onsite? yes
    • How is the quality of the product? Fantastic in fit, finish and function
    • Did the description onsite accurately describe the product? Yes.

    Seems to work just fine. However, they are not rated by any professional plumbing association and/or not rated ENERGY STAR. Therefore, after buying 4 of them for an apartment building i own in Los Angeles they would not pass inspection and i was forced to remove them. When they get some certifications i think this will be a good product.

    • How did the color on site compare with the actual product? Good
    • Please tell us about the quality of the product. Seems good
  • Nice Quality Good Price

    Received product quickly and was impressed with the quality. My only drawback was the need for other parts necessary to install the unit properly.

  • Updating a tank-type heater.

    I think this may be helpful for those who are considering replacing an existing tank-type heater, The heater arrived exactly when it was supposed to; the thing that got me was how small it was, even though I'd checked the dimensions before purchase. We have very old and internally rusted 1/2" galvanized pipes, but are planning to finish a copper replacement project soon. Since I didn't want to do things twice, I used copper for the neccesary repiping; as I didn't want to clog the heater, I elected to install a water filter on the inlet side which lowered the water pressure even more, near to the bottom end of acceptable. A pressure safety valve of 150 PSI or less must be installed on the outlet side and is not included; I pulled the one from the old heater, which worked fine after I built a T extension to accomodate it. The heater should be mounted to a stud and as close as posible to the old vent system; you may be able to grandfather the old system if it's in good shape, the heater is located in an unheated area with good ventillation. and the vent pipe has several inches of clearance (particularly on the top) Another important thing is the temperature setting; I found with the gas in 1/2" pipes that the max temperature was just under 115` F. The important thing to remember is the hot water flow is endless, so it is not neccesary to mix with colder water to extend the usable time; consequently I set mine to 114`. This worked perfectly and I could shower as long as I liked, while allowing a slight mix with cold water for a comfortable starting temperature. You'll probably need an extension cord for the electronics; although the length is given as 10', it is actually 6'. I think this heater is a HUGE bargain. It cost less than replacing the old one with the same model, has a longer warranty and should save a lot of money over it's lifespan, Although I had initial concerns over whether it would work for my situation, I found it did with a little tweeking and was very pleased with almost everything about it.

  • Awesome Water Heater

    This is a great heater and has a fantastic warranty it installed easily with no issues. I love it. what a GREAT value. I highly recommend this unit.

View All Most Helpful Reviews
  • Good at first... Now is going to the trash.

    Initially, I loved this unit. I told everyone and referred several people. Now, three years later, I have a unit that is unusable and am going to buy a more reputable and solid rheem product. The flow sensor failed and after getting the replacement one and paying $54 for overnight shipping, the flange it goes into fractured and failed, spewing water and flooding my basement. All the while, I'm told by "service" that it was my fault and it is not their problem. Nice! Don't waste your time or money unless you plan to replace it in 3 years and/or like for your house to be flooded.


    bathroomguy from Pittsburgh, PA, Aug 12, 2013

  • Check your gas service and venting location first

    This thing MIGHT run like a champ but I never found out. Why? because there was not a suitable location to vent the water heater in my inside-of-group rowhome. It can't be vented into an existing chimney like the old tank heater that only drew 30,000 BTU's of gas. The vent has to be 4' from a door or window and the basement windows and first floor rear door didn't have the clearance. Also, check your gas service if you are using NG to be sure your service and meter will support the 140,000 BTU gas load. Mine would not. The gas company would do the upgrade free of charge but it would entail digging up the front yard and replacing the gas meter. Installing this thing unless you live in the boonies is a job for a licensed plumber/gas fitter.

    • How accurate was the on site description of the product? poor

    galen52657 from Towson, MD, Jan 25, 2013

  • Gas Indoor Tankless Water Heater

    Replaced my mother's old water heater with this unit. After removing the old water heater you will need to buy some new fittings, relief valve, shutoff valves, and relocate the water pipes toward the wall where you will hang the unit. You will also need some vent pipe and some connectors and angles for the vent. Expect to spend about $160 more on these parts to complete the installation but it is well worth it in unlimited hot water, as long as you don't have too much demand on the system at once. Also much more economical to heat the water only on demand and not all the time. Installed for almost a whole year now with zero problems.

    • Please tell us about the quality of the product. Good quality and craftsmanship

    mdominey from Texas, Jan 2, 2012

  • very pleased

    I am very pleased with my experience with OVERSTOCK.COM, and most certainly will make future purchases from them. My tankless water heater arrived in 5 days. (I had allowed 7 to 10) It was in perfect shape! The price was just a few dollars more then I would have paid for a tank water heater. Now every time I think about making a purchase, I always check out OVERSTOCK.COM first. W. C. Snow

    • How did the color on site compare with the actual product? perfect
    • Please tell us about the quality of the product. extreamly good
    • How accurate was the on site description of the product? very

    merriford3 from San Antonio, Texas, Jul 27, 2011

  • had for 8 months

    Excellient product, works great even when using the shower, bathroom sink & Kitchen sink. no loss of hot water or pressure gas bill dropped alot $26. to $30 Month easy installation you do have to go to a major plumbing supply co. Home depot & lowes don't carry parts for installation one supplier i found: GPS plumbing supply co has everything.

    • How did the color on site compare with the actual product? matched
    • Please tell us about the quality of the product. Very good quality
    • How accurate was the on site description of the product? matched

    ahawksnj from NJ., Jul 4, 2011

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Product Q&A

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I live in colton CA how long would it take to arrive if I order on10/14/13 johnffjr on Oct 13, 2013
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Hello johnffjr, This water heater has recived excellent reviews! I apologize for the delayed response. Based on the estimated shipping calculator on the product page, if you ordered this item today, you will receive it on November 5. Please keep in mind that this is an estimation based on standard delivery options. I hope this helps. Thanks for shopping with us. overstockcustomercare1 on Oct 19, 2013

What is GPM flow with a temp of 110 bklynog1 on Nov 28, 2012
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The 40 series self adjusts based upon the GPM being pushed through it and the temperature it is set to. This is also subject to ground water temperature. overstockcustomercare1 on Nov 30, 2012

Can this unit be used in a no-vent home? needndc on Nov 26, 2012
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Unfortunately, this item requires vents. According to ANSI code, gas tankless water heaters normally require stainless steel, category II/III vent pipe. This is due to the fact that gas tankless water heaters actually burn at a higher BTU rating. As such, the gas is extremely hot when it leaves the water heater, but cools quickly. This cooling process results in condensation which could eat through regular galvanized pipe. For our tankless water heaters, we utilize Z-Flex single walled 3” diameter stainless steel venting. overstockcustomercare1 on Nov 27, 2012

Can I use the ecotemp 6.3 for radiant floor heating? rod1111 on Nov 8, 2012
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This can not be used for floor heating. overstockcustomercare1 on Nov 21, 2012

Is there an elevation limit to this water heater? I know that it may sound like a silly question - but many tankless water heaters I have seen are rated up to 4500 ft (I live at 4700) and I wanted to know if there was an altitude rating. Thanks joesurf on Oct 9, 2012
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This unit is only recommended for use up to 5,000 feet. overstockcustomercare1 on Oct 12, 2012

if i ordered today when it will arrive in Winchester Virginia betawi on Oct 8, 2012
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Standard delivery is typically five to ten business days. overstockcustomercare1 on Oct 11, 2012

how long it take to be deliver, we live in Winchester, Virginia betawi on Oct 8, 2012
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It can take up to 10 business days to actually leave the warehouse and once it does it is 1-4 weeks. overstockcustomercare1 on Oct 8, 2012

My existing piping is 1/2" copper rigid tubing lines. Do I need to change them to 3/4"? I was told by one HVAC gas fitter 1/2" is too small to handle the pressure flow , whereas 3/4" would need to replace 1/2"?  on Sep 6, 2012
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We recommend that you confirm this with your plumber. overstockcustomercare1 on Sep 7, 2012

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