Gas fire or Ch - effiency

oldskoo1

I have a gas fire which is 80% efficient, which by gas fire standards is actually quite good.

Our house is a 4 bed detached, fairly new build and well insulated and overall efficient and cheap to run.

Over winter we run the ch 24/7 and it works out well for us on cost. We run at 16c all day, boosting to 18c in evening.

My question is, boosting to 18 we are heating the whole house when we spend all the time in the living room.

Would it be more efficient to use the fire to boost the temperature instead of boosting the ch to 18? Without doing readings, I wonder if anyone could hazard a guess, how much gas would the fire use compared to the whole ch system?

Thanks.

daveyjp

The only way is to use the heating for a day and then the fire. You will need two days when day temperatures are similar.

oldskoo1

I was hoping someone may have already done this and shed some light on the costs roughly.

I've done the measuring before but it's hard to do in this changing temperature.