Steph Gray @lesteph.com · Dec 15 Here's the heat loss calculations. Design temp I think is 50C at -1.95C. One zone, i.e. open loop I think (configuration 10 on the Sensotherm panel)
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Heat loss calcs in the main are oversized. So whilst curve 1.0 in the book would be about right for 19.5C indoors (50C at -3), i'd start lower. It's the old Heat Geek trick. Keep dropping the curve until you get cold. Then knock it back up one.