AsI understand the spec sheet efficency the Buderus 125BE the 93% is
for under 131f. what is used for radiant tube. I wonder how much they
loose at higher temps, I bet maybe 5%.You probably cant do with 131f
all winter or maybe at all. If what you have now has more than 10
gallons of water in it your present efficency rating is optimistic,
it may have alot more water like 20 -30 gallons.
Here is an Idea I am going to do, Polyisocyanurate foam board 1" is R
7.2, with a dual radiant foil barrier. Sincemy radiators are mostly on
cold uninsulated exterior walls I am going to glue and screw a piece
of painted foamboard againt walls behind radiators. I know a large
percentage of a radiators heat is radiant, so the foil facing should
greatly help make it well above R 7.2 , but if you try it the edges of
the board must be caulked tight under the boards or condensation and
mold will grow behind the foam, I know it happened to me. It should
easily gain a few % by not heating a cold uninsulated exterior wall,
but instead reflecting that heat inside.
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