We halved our heating costs by switching from oil burner to geothermal energy. On top two floors the radiators remained but in the basement we have radiant heating. The system has altogether five zones - one for the radiators since they require much hotter water than the radiant and four for different rooms in the basement (the sauna and bathroom have two degrees warmer circulation so that the floor dries up faster).
Previously our heating costs were in the region of 3000 per year and now the are roughly 1500. The system cost 16 grand so it should be less than ten years for it to have paid itself.
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