Heatloss calcs

[m_c]

Just revisited your walls calculation. R = 0.2 per inch, so a 4" brick = 0.8, so U in SI units = 5.682/.8 = 7.1, so your heat loss through the walls is 7.1 * 53.9 * 20 = 7.6kW. I note your calc was 5 * 53.9 * 20 = 5.4kW, yet you wrote = 1347W ???

I honestly don't know where I got that one!
But those figures certainly sound more plausible.


I'll do some calcs later to figure out how the different thicknesses of insulation will affect things, as I may swap the 3x2's for 4x2's, to get that bit extra insulation.