Electric Tankless Water Heaters – EVERYTHING you need to know

Electric Tankless Water Heaters - EVERYTHING you need to know

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This is everything you need to know about electric tankless water heater to decide if one is right for you. This discussion is about “Whole House” models meant to serve your entire home, not “Point of use” meant for one specific fixture. We will do another one about those those later so be sure o subscribe.
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Converting to a Tankless Hot Water Heater

What to expect when installing a tankless hot water heater and the pros and cons of going tankless.

33 thoughts on “Electric Tankless Water Heaters – EVERYTHING you need to know”

  1. I got more info in the first 3 minutes of this video than in all the other places I've looked combined. Good stuff.

  2. Thank you for making this video . I desperately need your help . I live in NY in a private house in the attic . My landlord died and National Grid would not open a gas account on my name, so I now live with no gas and no hot water . I am 19 year old girl and I don't know anything about pluming . I was researching on how I can solve this problem and found your video .

    Which electric water heater I should get ? The cheapest the better . Something that would work all year around.
    The whole attic is not that big .
    I have a small bathroom with a bathtub (shower )and 2 sinks .
    I like to take baths ones in a while.

    I have neighbors on the 1 and 2 floor who also don't have hot water so we tying to decide should I just get a small one for my attic or get a big one for a 3 story house ?

    I would greatly appreciate any advice you can give me . Thank you .

  3. Couple other whole house electric models other than Seisco Electric Tankless that you would recommend? Live in modular home w/ well but we (2 adults in home) don't run showers/washers around house at same time (2 Bath/DW/Washer). Want to replace electric water heater that is in a closet in a BR (don't know why this builder thinks this was a good idea)!

  4. I've seen you have several videos about tankless water heaters. I have a question I'm hoping you can answer, or direct me tl which video may help (if one of your videos covers this)

    Our tankless water heater had an excessive amount of water dumped into the vent and into the unit itself. It leaked out of the unit onto the floor. Its been opened up and had a fan blowing on it as well as a dehumidifier running under it. Its been drying out for a little over 12 hrs. It will turn on and run and get water hot but makes like a metal humming type of noise (best way I can describe, or like a stuck fan motor trying to run but the fan blade it stuck, if that makes sense)

    Any suggestions?

  5. Thanks for the videos, always informative. Quick question: When low monthly cost is the main aim would you advice electric or gas for a ~1000 square feet NYC apartment?

    A bit of background info:
    We've got southern exposure and very thick brick walls, about 2 feet since the apartment is in a building which used to be an old commercial warehouse that got converted into loft units. Because of the good insulation and war exposure, our place never gets too cold in winter (luckily not too hot in summer either), in fact we use our "through-the-wall and under-the-window" gas heating unit for no more than 1 or 2 weeks top in the entire year. That said the water coming out of the faucet is quite chilled year round (probably due to the pipes being deep underground and being well insulated throughout the building) and while that's very nice in summer as we got no much need to cool that water, it means that any heater would have to be work hard to heat up the water it will get supplied as the difference in temperature to bring the water to that >100ºF point (and keep it long enough for showers and other domestic uses) will always be several tens of degrees give or take maybe some 10 degree between summer and winter.

    Unfortunately the current electric tank water heater is located some 30 feet away from the nearest window and we have no way to poke a hole on a wall or ceiling/roof (we have other units on 2 sides, hallways and stairwell on another and can't touch the side with the façade (so we would have to vent using a window opening) which makes it difficult to think about tankless gas heater as we would need to have a long exhaust line installed and I am not even sure that's actually possible or up to local codes… that's why I thought about electric tankless. Although I just don't want to switch from an expensive electric tank heater to an equally expensive tankless one when the aim is reducing monthly electric bill while keeping a decent hot water supply for showering, washing up and doing dishes (which is really all we use hot water for since we got coin operated laundry in our basement).

    Thanks in advance, any and all advices will be much appreciated :)

  6. Fantastic video, thank you so much for it! I couldn't make out the brands of units you were saying had modulated amperage & microbubble channeling. Could you name the brands you think do a decent job in these areas? I know you're not endorsing or advertising; I just want to get a sense for the sake of comparison. Thanks!

  7. Thank you, Mr Gregg!
    I was looking at getting a tankless and was able to determine that this was not the way to go for where we live.

  8. I just bought a different brand then you promote ….so we will see….will post if it doesn't work as the Manufacturer states. Thanks for some good information !

  9. Hey Mr Gregg!! Thank you for this OUTSTANDING video! I've been researching these units (in general) in order to convert my home from my tank to the tankless. What are your thoughts on using a whole home AND point of use units together? In my area my avg. water temp is 62-70 degrees (Alabama) and I'm anticipating a heavy use flow need of about 5.0/gpm +/-. I have a two story home with 2 full baths upstairs and the laundry/kitchen/half-bath downstairs. Just wanted your thoughts on using the two types of units together or what you might recommend–in general–in this situation. Again, thanks for your time and knowledge on this video!!!

  10. I don't think I would ever find someone who could make a an informative but interesting video wrt tankless water heaters! Well done, thanks!

  11. Great video, thanks! Do you have a video where you discuss the smaller single/multi-point electric units? I'd really like those installed in my bathrooms and kitchen but I haven't found a good overview of the pros and cons compared to whole-house units.

  12. nice, i always had questions, and he jus answered most of what i needed to make up my mind, very direct and he stayed on subject, very good watch.

  13. What is your location? This is a huge factor in determining temp rise per gpm. You mentioned freezing in the attic but city/town and state would help, thanks!

  14. If it's in the attic, a great solution in the event of a leak is to put a drain pan underneath the unit with a water sensor or float switch that is connect to an inline solenoid on the cold water supply line. Then put in a check valve on the hot water side and you have a safety overflow system. I've done this on several attic installations and it works perfectly. Thanks for the vid. Cheers

  15. Great video, it's good to see a good review from a user and not a salesman to help me make my decision on buying one, and to make good sense of why you got one instead of just getting one for no reason then just to have it.

  16. Can you tell me if I need a dedicated circuit breaker for it and what AMP breaker I should use?
    As for modifying the GAS line, do I need to call my GAS company to come out and do that…and how much the cost?


  17. The Rinnai Tankless Water heater I have has a heater built into the unit so if the temperature ever gets around or lower than freezing, these heaters will kick on to keep the water from freezing within the unit.  You have to consider this current draw when doing the wiring for the unit. When (if) the heaters kick on, that's the most electrical current draw for this unit (otherwise, it's minimal electrical draw to power the electronics, normally).  So, you shouldn't have to worry about freezing UNLESS you lose power in the winter and have no way to keep the tank from freezing (which could happen).

  18. Your comment at the 6:00 minute mark sortof answers a question I had, and that is it appears your heater is installed in what I presume is an unheated attic, and I was curious what the risk of water pipes freezing was running them up into an unheated attic.  I'm just learning about these types of heaters and I will remember this as a possible option.  Thanks.

  19. A large computer UPS (110v Backup Battery) would provide enough wattage to weather a large grid power outage so your water heater would keep operating.

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