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# What does it all mean?

#1
09-04-09, 08:27 AM
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What does it all mean?

What do all the ratings mean on my boiler? The net I-B-R, the DOE, and the Input rating? So far I have been told the DOE is what you match to your heat loss. The input, I assume, would be the amount of energy in gas it consumes to get he output. So what would the I-B-R be used for?

#2
09-04-09, 08:36 AM
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You are right the Input is the amount of fuel inputthe boiler is certified for.
The DOE (Department of Energy) is a combustion test, a specific gas at a determined temperature is passed through the boiler and the exit temperature is obtained. After some other data is gathered it is applied to a formula and determined what the standby losses are, chimney, jacket etc. The net output is just a standard formula for piping losses. The Net output normally is higher than the formula results.

#3
09-04-09, 08:52 AM
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When you say "net ouput" do you mean net I-B-R? I'm still not sure how I would use that number. Should I just not be concerned with it for what I am doing?

My current boiler is:

Input - 164,000
DOE - 135,000
Net I-B-R - 117400

#4
09-04-09, 08:55 AM
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The only number you need to be concerned with is the DOE. This is what needs to match the heat loss. Net output and IBR are the same.

#5
09-04-09, 09:30 AM
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With the Buderus boilers there is a:

"Heating capacity (gross output)"

and a

"Thermal output (net IBR output)" listed.

Would the "Heating capacity (gross output)" be the equivalent to the DOE rating? I too thought that DOE should be used to match against heat loss, but was surprised to see that it wasn't listed as such on the Buderus. Which is why I mentioned IBR on the heat loss thread.

The Burnham MPO I&O lists both IBR and DOE.

Al.

#6
09-04-09, 01:31 PM
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Gross output and DOE is the same rating. Years ago everybody had the gross output but I thought everyone switched to DOE now. Just not the Germans I guess.