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ERGOMAX Domestic Relief Valve?

Does a Ergomax E23 indirect tank need a TnP relief valve on the domestic side of the tank? The one i worked on did not and only had a 30lb relief valve on the boiler side of the tank which is correct. My question is "god forbid " street pressure increases or the thermex tank ruptures, where does the extra domestic pressure go or release? Thank you

Comments

  • GordanGordan Member Posts: 891
    Should be in the installation manual

    I'm pretty sure that every water heater is required to have a T&P valve on the domestic side. I just recently installed a Turbomax (reverse indirect like the Ergomax) and the installation instructions stipulated that a field-supplied T&P valve with a max 150 PSI rating (I think) be installed on the DHW outlet.
  • Jean-David BeyerJean-David Beyer Member Posts: 2,656
    Relief valve on indirect?

    I do not have an Ergomax, but I do have a W-M (tank within a tank) indirect. The installation manual insists on a T&P relief valve, and specify that it should relieve at 150F and be rated at 100,000 BTU/hr (for the size tank I have). They do not say at what temperature it should release. I assume it is slightly below the boiling point.



    I could argue that since the hot water from the boiler is below the boiling point, that the water in the domestic part of the tank would not exceed the boiling point either. But I bet that argument would get me nowhere with an inspector, so I would not even try. Besides, if something went wrong with the boiler and the water did exceed the boiling point, it would be nice to have a relief valve in there.
  • Mark EathertonMark Eatherton Member Posts: 5,843
    Absolutely required by code...

    Pick a code. Any code. They ALL require a working T&P relief valve within 6"s of the outlet of the tank on the potable side, AND an appropriate relief valve on the boiler side of the tank.



    The Ergomax and Thermomax are essentially large heat exchangers, but it matters not. If it generates domestic hot water, it MUST have protection.



    ME
    It's not so much a case of "You got what you paid for", as it is a matter of "You DIDN'T get what you DIDN'T pay for, and you're NOT going to get what you thought you were in the way of comfort". Borrowed from Heatboy.
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