NET I-B-R RATING

FTWIII

CAN ANYONE EXPLAIN THE DIFFERENCE BETWEEN THE NET I-B-R RATING AND THE A.G.A RATING ON A HOT WATER BOILER. THANK YOU.

Alan (California Radiant) Forbes

I=B=R

From what I remember, the A.G.A. rating is the efficiency of the boiler, typically 80% on an atmospheric appliance.  The I=B=R rating is a further 15% reduction of the A.G.A rating.

HDE_2

IBR

IBR is a standardized calc allowing for piping loss getting the heat to the conditioned space

icesailor

IBR Meaning:

It has always been my understanding that the gross output is what the engineers decide what the boiler is capable of doing. It is up to YOU to figure out where the losses are.

With the IBR rating, it is the realistic output of the heating appliance allowing for piping and pick up. And what the boiler will deliver in real world conditions under "normal" piping design. That if when doing a heat loss calculation for  building, if you do not exceed the IBR net rating, the boiler will perform as advertised.

Or, so I have understood and practiced.

scrook_2

I=B=R & "pick-up"

I=B=R takes 15% off the gross *output*  of hot water systems for piping "pick-up" and 33% off for steam piping "pick-up".

See: http://www.heatinghelp.com/forum-thread/96436/Which-rating-and-why-Please

for more on piping pick-up

scrook_2

I=B=R & "pick-up"

I=B=R takes 15% off the gross *output*  of hot water systems for piping "pick-up" and 33% off for steam piping "pick-up".

See: http://www.heatinghelp.com/forum-thread/96436/Which-rating-and-why-Please

for more on piping pick-up

CMadatMe

DOE/Net

When sizing a boiler use the DOE (AGA) rating when the boiler is installed in a conditioned space and the Net rating when it is not. The net rating allows for 15% piping loss.