Tankless water heater: Point of use

Discussion in 'Tankless Water Heater Forum' started by ron in sc, Apr 10, 2008.

  1. ron in sc

    ron in sc New Member

    Messages:
    80
    Location:
    South Carolina
    Is there any rule of thumb for distance to the end use when using an end use tankless electric hot water heater?

    I an considering putting one in my garage. Useage will consist of front loader washing machine, sink, and shower. Shower will rarely be used. Tank would be mounted in a closet next to washing machine. Circuit breaker is only 30 amps.
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,266
    Location:
    New England
    Unless you can upgrade the circuit, forget about a tankless...the volume of hot water would be very small, if you can even find one that small. You might think of a 30A as a water warmer...30A is okay for most water heaters. Spend a little bit and insulate the walls of the closet well.
  3. ron in sc

    ron in sc New Member

    Messages:
    80
    Location:
    South Carolina
    The garage is well insulated because it has air conditioning and heat. It would be more trouble than I would want to undertake right not to change to 6 or 8 gauge wiring. I think I could change circuit breaker and up amperage and make it a 120 volt outlet if that would be of help.

    I did find a 220 volt Bosch unit rated for 30 amps. Do think that would be inadequate? It's the one in link below.


    http://www.cpotanklesswaterheaters.com/electric_products/point-of-use_tankless/ae7-2_spec.html
  4. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,386
    Location:
    Yakima WA
    Several years ago, I found a small tank less heater for my shop utility sink. When I finally installed it, my subpanel in the shop was too small, so I had to run a special circuit from the house to the shop. I required #10 wire and 220 vac. It's really a pitiful device, but I do get hot water to wash up after working in the shop or yard. It would never work for a washing machine or shower. A tank less heater big enough for what you want would be extremely expensive to buy, very expensive to install, and they require frequent service. You would be far better off to install a regular water heater.
  5. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    Degree Rise at 0.75 GPM Flow Rate 63°F
    Degree Rise at 1.0 GPM Flow Rate 48°F
    Degree Rise at 1.5 GPM Flow Rate 32°F

    How long do you want to wait for the washer to fill up?
    This thing barely makes enough hot water to wash your hands with at a lav sink!

    What is your incoming water temperature in the middle of winter?:confused:
  6. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,266
    Location:
    New England
    Power is amps x volts, so, halving your voltage to get the same power, you need twice the amps...switching to 120vac will just mean your leads are even less capable of producing the heat you want.
  7. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,047
    Location:
    Cave Creek, Arizona
    heater

    It's a good thing the shower is not used much, because whenever it is used you should be prepared for a cold shower because 30 amps is not going to give much hot water. You may be lucky to get warm water for a shower. There is nothing that keeps you from putting the tankless heater wherever you want it, but the rationale for a tankless is that it can, and should, be installed as close as possible to the major usage area.
  8. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    Don't even think about upping the size of a circuit breaker, unless a licenesed electrician tells you the circuit wire is sized for the amps you want. Likely it is not, because a builder would only put in the size wire needed for the circuit as installed.
  9. ron in sc

    ron in sc New Member

    Messages:
    80
    Location:
    South Carolina
    ,

    Yes, I need to forget about that I checked and the wire is only 10 gauge.
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