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Sizing question for high-eff boilers

John McArthur_2
John McArthur_2 Member Posts: 157
in THE MAIN WALL
I'm installing several Buderus GB142 boilers on an upcoming project. My question is, do I need to de-rate for altitued as with an atmospheric boiler? I have a building with a calculated heat loss of ~60k Btu/hr and a 80 gal Triangle Tube indirect at 7,000' elevation. Curious if the GB142-24 will be big enough for the load.

Seems to me that the boiler might carry the space heating but be too small for the DHW. Just want some other opinions.

Comments

  • Steve Ebels_3
    Steve Ebels_3 Member Posts: 1,291
    Info

    Call Buderus for precise info on derating the boiler. Any combustioni appliance has to be derated for elevation. It's a function of the thin air which carries less O2 than at sea level. As far as the heating DHW question goes. The best thing to do is select a control that will prioritize your DHW production allowing the boiler to switch off the heating side while it concentrates on your tank. I believe the G has this feature built in.
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