Boiler flow temperature

Question

What’s the ideal flow temperature to set my boiler to? Should I alter it between autumn, winter and spring?

Alex · Answer

There is no simple answer to this question.

When the boiler manufacturers state their appliance efficiency, it is with a flow temperature of 60°C. For many years, radiators have been sized for the rooms they are cited in with a flow temperature of 70°C. Therefore the room might not get warm enough if you lower the flow temperature.

If that room contains the room thermostat, you might never get it warm enough to switch the thermostat off. You would be gaining some efficiency. However, the boiler would be working 24 hours a day trying to achieve a temperature which it can’t.

If you have a hot water cylinder and lower the flow temperature the hot water cylinder might never get hot enough to switch off on its thermostat. Once again, you could be burning gas 24 hours a day trying to achieve the impossible.

If you have a combi boiler and decent sized radiators, you can play around with the flow temperature and see what works for you. It is not one size fits all.

Paul · Answer

If you have an eco setting put it there if not around 60 is good if it gets exceptionally cold turn up to 70.

Kenneth · Answer

Sixty degrees and seventy degrees is the ideal temperature for the flow for the central heating system to be set on

Dean · Answer

i should set it at about half way on the dial. this should be about the correct temo

Adam · Answer

Hi Christian , Your boiler should be set to sixty degrees for your heating and your room thermostat set around seventeen degrees depending on how warm you like to feel. Hope this helped

Boiler flow temperature

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