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Hot water heating efficiency
I have a hot water radiant system running off propane recently installed in our building. The building is only occupied twice a week.
We have been letting it cool down to 15 C then heating it up to 20 C doing this we have burnt through almost half a tank of propane in a month.
Is it more efficient to keep the building warmer the whole time or let it cool down more and then heat it up on the days the building is occupied?
My thought is that whenever the building is occupied it takes a lot of propane to heat the water and the building back up so were not actually saving any money by keeping it so low. So we would keep it a 18C then heat the building up from there.
Thanks for your help.