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Sizing Boiler for Indirect

Rob Blair
Rob Blair Member Posts: 227
Okay, here we go again. Sizing up a house, 78K heatloss, and I want to install a 60 gallon indirect. All electric boiler. House is Polysteel so it is like a fridgerator. Planning on using a SMart 60 tank and an Electro boiler.





  • hot_rod
    hot_rod Member Posts: 22,143
    An electric wh

    would be less expensive and more efficient as the electric goes right to the DHW without the loss of the piping, pumping and HX with the indirect.

    Depending on their DHW needs an 82 gallon tank can furnish most large households. Plenty of 50 gallon tanks in my area for average users.

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Rob Blair
    Rob Blair Member Posts: 227
    Thanks HR.

    Didn't someone just post about trying to uncomplicate things.


  • jp_2
    jp_2 Member Posts: 1,935
    simplier yet

    if you have the service capacity, go on-demand electric and rid yourself of the losses from that 60 gal heat radiator.

    add a little solar preheat and now you're greening.
  • joel_19
    joel_19 Member Posts: 931

    Never size up the boiler for indirect on residential,size up the tank instead. Kills boiler eff when you size up.
  • Unknown
    It's an electric boiler

    It may short cycle the relays inside it, but the efficiency won't change.

    I like the separate electric water heater tank.

This discussion has been closed.