Gas boiler - which is more efficient?
Discussion
House with poor energy efficency (no insulation in walls or under floor, single glazed sash windows and tall ceilings). The once up to temperature, the house loses 1-2°c per hour if the heating is turned off and will fall back to 10-12°c.
Which is best?
1/ Running the boiler for 2 hours @ 50°c temperature. (Boiler cycles roughly 3 mins on, 4 mins off).
2/ Running the boiler for 1 hour @ 80°c temperature. (Boiler doesn't cycle, constantly burning gas).
I always thought running it cooler for longer would be more efficient - the radiators are always warm and the gas is being burnt only about 40-50% of the time.
However, I have been told that running the boiler on its max setting for a shorter period would be more efficient, as even though it is burning gas the entire time, this works out less than the constant starting cycles it has to do under example 1/.
Which is best?
1/ Running the boiler for 2 hours @ 50°c temperature. (Boiler cycles roughly 3 mins on, 4 mins off).
2/ Running the boiler for 1 hour @ 80°c temperature. (Boiler doesn't cycle, constantly burning gas).
I always thought running it cooler for longer would be more efficient - the radiators are always warm and the gas is being burnt only about 40-50% of the time.
However, I have been told that running the boiler on its max setting for a shorter period would be more efficient, as even though it is burning gas the entire time, this works out less than the constant starting cycles it has to do under example 1/.
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