[Equest-users] Condensing Boiler HIR

Steve Tobin stobin at smithboucher.com
Fri Dec 23 11:44:59 PST 2011


I am trying to settle a dispute within our office.


Our design utilizes Fulton Condensing Boilers with a design Return water
temperature of 160 deg. F and an outdoor air reset schedule.

Our dispute is what to enter as the HIR for the boiler.  The boiler is
86.5% efficient at 100% fire and 160 deg. F return water temperature,
and 96% efficient at 100% fire and 80 deg F.


It is my understanding from everything I have read that the HIR needs to
be 1.156 which would be 86.5% efficient.  Is this correct?  Also how
does the default e-quest HIR-fPLR curve function?

Thanks for any help.



Steven C. Tobin Jr., P.E.


25501 west valley parkway

olathe ks 66061

direct 913 344.0061

fax 913 345.0617


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