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Switching to gas, trying to size a water boiler
We bought a house last year. The oil killed us, and we had an opportunity to add gas to the house cheap. I would also like to have more space in the basement (big oil tank there). I have been trying to size, a boiler, and would like some opinions. Quick run down, I will describe the best I can:
House was built in 1911
It is about 2000 sq ft.
Outside construction is stucco
Inside walls - some are plaster/lathe. Some plaster/lathe with paneling over them.
Drop ceiling (10ft)
Most of the windows are updated in the last 5 years. About 10 are not, but they are in good condition and not drafty.
Finished basement, finished attic (bedroom)
Baseboards are in the basement, attic, and a front add on room.
5 rooms on the first floor
3 rooms on the second
All other rooms are wall mounted low cast iron radiators.
Current oil boiler is a Trianco HC-175 - 175 mbtu gross output/152 net output (I take it this means 175000 btu) I think it was installed about the early 1990's.
From my calculations I seem to need to be at 88,000 btu. I will have four floors to heat. We may add a small room down the road. I was thinking of going to 100,000.
Does this 175 seem like it is oversized? Is there other factors I should take into consideration? I am up in the air about whether to go conventional or something energy efficient.