Replacement Boiler Calculations
I have read Dana s instructions on how to calculate the size for replacement boiler. I did my own calculations but am a little shaky on that and was looking to see if I’m in the ballpark.
here is my information
7500 sqft house with 9 zones smallest zone is over garage room About 400 sq ft…radiant part is pex in concrete over plywood, with hardwood and tile as finish surface.
99% outdoor design temperature =12 F
39.9 deka therms associated with 1040 degree days.(65 degrees)
current boiler is burnham that is rated 164k btu/hr input…has 2 outputs on name plate one is DOE 136 kbtu and the other is h20 118 kbtu/hr(I assume this is the one you should use for this calculation).
radiant heat is somewhat exotic in my locale, and have had poor luck with the local folks, so I’m trying to do all the homework myself.
I am thinking the HTP RGH 100kbtu (2:1 turn down ratio) could possibly be a good option. It is relatively inexpensive and from my limited understanding of these systems might better handle the micro zones?
Is there a better option for a heat source considering cost/benefit.
also the current boiler has 1 1/4 inch inlet hooked to the same sized manifold…the htp has only 3/4” inlet, would this be likely to cause an issue?
Any suggestions/directions would be greatly appreciated!
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