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Old 03-03-10, 02:08 PM   #3
Piwoslaw
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I got 175 kWh/m2 per year. I had to do a bunch of approximating (I don't yet have data for the full heating season, and can't find bills from previous years), so it could be off by 20%.

EDIT (25-06-2010): I finally completed a full year of logging the gas usage, so here is better data:
  • During the last year we used 1932 m3 of natural gas,
  • The non-heating average is 0.5 m3 per day,
  • So we used 1747 m3 for heating.
  • Nat. gas has an energy value of around 32 MJ/m3 = 8.9 kWh/m3.
  • The house's floor area (without unheated basement and garage) is 110 m2, so
  • Our house is at 141 kWh/m2/year.
I'll have to look for old gas bills to get a multi-year average, which would be much closer to being objective, since this past winter was the coldest in 30 years.

Last edited by Piwoslaw; 06-25-10 at 04:57 AM.. Reason: Data update
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