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Indirect HWH on steam Boiler?

Norm Harvey
Norm Harvey Member Posts: 684
Here are some tips.

Your not dealing with lift, but a lot of this could still be helpfull.


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  • Saggs
    Saggs Member Posts: 174

    Have a customer looking to upgrade from an internal coil on his Weil Mcclain steam boiler to somthing more productive. I was hoping to install a smart 40 or somthing similar. I'm thinking to pipe the return in down low and pull the supply out near the top of the water line, within reason. Any thoughts on this? Thx
  • Saggs
    Saggs Member Posts: 174

    That's a good link, thx. I should probably measure up all the radiators and find the heat load existing in the home now and then see if i have enough to add an indirect. If there's capacity, should I have domestic priority or steam priority?
  • Unknown
    No Priority

    For an indirect water heater (rather than a zone of heating), you don't have to limit the size to the pick-up factor. The whole boiler output will be used (can't stop it) and the steam production will be slowed by the indirect load, which "IS" priority for the water heater, intended or not.

    Like hot water heating with priority, the whole boiler output to the water heater isn't a bad thing, as the time heating DHW is minimal and space heating will take over as soon as the indirect satisfies and the burner stays running, and the DHW pump shuts off.


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