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Hot water heating efficiency

Hi,
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.
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.
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Comments
Are the occupied times the same?
Size of building?.
As been said radiant has mass depending on the construction detail.
Occupied times are the same every week and there are two programmable thermostats one upstairs and one in the basement.
Tube in concrete in basement? Upstairs main floor?
During recovery periods, is the boiler less efficient? No, it is more efficient.
Rads have mass depending on what type they are. Ci, panel rads etc.
I’m still in the belief that deep setbacks can be brutal to bring on line intermittently. What is sacrificed is comfort. Call it the cold 70.room temp is 70,but the mass of the room is 62, and sucks the heat right off your body.
You might have to experiment with a setback that satisfies the wallet, and the body when occupied.
System Photo: https://us.v-cdn.net/5021738/uploads/FileUpload/79/451e1f19a1e5b345e0951fbe1ff6ca.jpg
Reconnect the outdoor reset and don't go with such an extreme setback.
Albert Einstein
If the CI boiler gets a constant flow of sub 135*return water it will soon rot the HX due to condensation.
Some pictures of the boiler piping are in order. This may possibly be why the ODR was disconnected. However I’d be willing to bet as others said it’s lack of understanding.