Central Heating

Boiler central heating return temperature too high??

Anonymous user 28/11/2025 - 8.00 AM

I have balanced my central heating system in my house. All the heaters are showing a temperature at the top between 55-60c. And at the bottom they are 10-12c temperature drop. Reading online this is what is recommended. My boiler outlet temperature is currently set to 70c. I know this is higher than what is recommended and not very efficient but I noticed the heaters do heat up much quicker Vs 60c setting. But what I'm confused about is it's showing a return flow temperature of 67c. I was expecting the return temperature to be much lower than that. Surely the water is not loosing 3c heat after heating my radiators? Do I need to somehow lower the return temp? Thanks

Anonymous user

If your lock shields are wide open too much, the water is not staying in the Radiators long enough to dissipate, and is returning to the boiler without expending its heat. One option is to Choke down the lock shields a bit so as to slow the flow rate

Answered7 January 2026

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your distribution circuit( radiators are not giving off heat to the required spaces, hence the high return temperature.

Answered27 November 2025

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