Right way to plumb tankless w/h?

Discussion in 'Tankless Water Heater Forum' started by Randyj, Jun 22, 2010.

  1. Randyj

    Randyj Master Plumber

    Nov 25, 2006
    I've only installed one tankless water heater so don't know much about them. Is there truly a "right way" to plumb a tankless water heater? Should there be an expansion tank, check valve, pressure gauge, etc.???
  2. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona
    tankless heater does NOT have any stored water and it only heats while water is flowing, so it does not NEED an expansion tank, or check valve, and few even have provision for a temperature relief valve, although all of them come with a pressure relief valve. None of these are needed IF the heater is working properly, but then, safety devices are installed to take care of problems when things DO NOT operate properly.
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  4. Scott D. Plumber

    Scott D. Plumber In the Trades

    Jun 30, 2009
    Find an instalation class in your your area for Noritz or Rinnai. They are usually free and are just what you need.
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