Rob R. wrote:
I guess the issue I have is when I run the heat loss calculator, admittedly a very imprecise tool, I have to input a very high level of insulation in order to reach 27k per hour heat loss at 20f. I just don't my house has that much going for insulation wise, but then again I've only been charting coal use accurately for 2 days now, so maybe it all makes more sense after a month of doing this.
A few months ago I posted somewhere about the futility of sizing a boiler for an old house based on a heat-loss calculation full of estimates about insulation and infiltration. A heat loss is part of the process, but it doesn't get the last word.
I took a very scientific approach towards my boiler installation.
Month 1 buy boiler.
Month 2-5 Ignore boiler completely (it was summer)
Month 6 Hurry up to install boiler (it was cold out)
Months 7-48 Learn about all the things I did wrong in months 1-6.
I actually replaced one boiler with another of the same general size. I now realize that the original boiler had been installed prior to the house being insulated and the storm windows going on, so the real boiler size should have been some fraction of what I actually bought.
As for heat loss, I only did that after the installation, and until I figured out how to accurately track the coal usage, it was merely a guess.
Now I will know exactly what my heat loss is, based on the coal usage. Well, close enough to lie about it, anyway.
So far, it looks like it's much lower than I would have anticipated, but I still have lots of data to collect.