Sizing question for high-eff boilers

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John McArthur_2
John McArthur_2 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.

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  • Steve Ebels_3
    Steve Ebels_3 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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