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Pickup factor. Help me understand
I'm a bit confused by the use of a 33% pickup factor.
The way I see it, with your piping insulated as it should be the piping should dissipate a fairly small amount of heat. Now in my system my pickup factor is something like 31,000 btus. Once the piping is hot I could see it dissipating maybe 5000btus through the insulation, but 31,000?
So my question is, why do we need a 33% pickup factor if all of your piping is insulated? Wouldn't something like 5% do just fine?
Is the 33% there to makeup for missing insulation and poor venting? Is it simply a fudge factor and not actually necessary if everything is perfect?