This is a very common mistake indeed. The number of times you hear someone
say "it is cold in here, I will turn up the radiator" when the radiator is
already on and doing all it can. Two hours later they are sweating!
The water temperature in the radiator can be adjusted by adjusting a dial on
the boiler (or at least it can on mine).
I keep my boiler temperature fairly constant during the year. I may up it
slightly during severe frost conditions.
The temperature I set it at is round about 70 deg F
Next I set the controller for the boiler to start at 6.30am and go off at
9.30am. Next period is from 4.30pm to 10.30pm
But of course we override these settings if the house is too cold or too hot
The real control is at the radiators and each one is set for a different
temperature, bathroom bedroom etc.
Again these settings are altered to suit.
I really don't know the economics of keeping the boiler on all day at a low
temperature but I suspect if you do then you will be turning it up for cold
periods to be comfortable.
In a house of more than one person it is impossible to suit everyone.
For example I often work in the garden when it is quite cold outside and
when I come in the house is too warm for me but ideal for my wife who at
that time may be sitting.
The real message is that radiator controls are used to control the
temperature in a room but they are not instantaneous.
Hope this helped
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