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Rbertalotto's avatar
Rbertalotto
Explorer
Apr 11, 2015

800w / 12v DC Water Pre-Heater???

Over at "Surplus Center" they have a 800w / 12V water heater for $20

Would this have value as a preheater at the sink or shower level to get hot water faster?

http://www.surpluscenter.com/Electrical/Miscellaneous-Electrical/Miscellaneous-Electrical/800-WATT-12-VDC-WATER-HEATER-11-3439.axd

12 VDC WATER HEATER
New, THERMO KING model 12-923 water heating assembly. Made as part of a winterization kit for heavy duty trucks. Includes mounting feet, connection box and hose barbs.

SPECIFICATIONS
Voltage 12 DC
Wattage 800
Ports 1 " NPT
Hose Size 3/4" ID
Size 16" x 4" x 4-1/2"
Shpg. 6 lbs.
  • pianotuna's avatar
    pianotuna
    Nomad III
    Apr 11, 2015
    Cheapest way is to have a valve to divert water from the lines back to the cold water tank. No additional (high temperature) pump needed.
  • JiminDenver's avatar
    JiminDenver
    Explorer II
    Apr 11, 2015
    A insta-hot would fill your needs on a small flow basis.

    We stick a clean pot under the faucet until the water is hot. That water is clean too so it is used in a variety of ways. We only run the hwh for showers, so the catch water is heated by running it through the coffee maker for dishes and such. If the water in the heater is still hot, we use the catch water to rinse with.

    Power is a none issue with the solar but water is in limited supply with only 60 gal for up to two weeks. Not wasting it means we still get to shower everyday and use real plates and utensils. Letting it run till hot may only waste a gallon or two a day but that's a shower for one of us.

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