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I have a radiator which does does not get as warm as other radiators (there is no air in the radiator). I have opened lockshield valve slightly more and also tried removing the thermostatic valve but it is still only slightly warm. I have noticed the area around the lockshield valve is getting...

Any idea why I am getting temperature difference (drop) of only around 5 degrees? Is there a problem with the pump?

My boiler is Potterton Promax He. I don't know the kw rating.

Which pump with a good head do you recommend as a replacement for British Gas Multi Head G P/N 595061809 PC 0841?

Thanks for your reply. The new radiators are connected to the existing upstairs circuit. The installer has tried to rebalance the system but would like to know if pump with faster flow would help. I think Grundfos UPS2 15-50/60 has faster flow then my existing pump (British Gas Multi Head G...

My house initially had 11 radiators and all of them worked very well. Now 4 extra radiators have been added due to extension built to the house. The problem is that these 4 new radiators are not heating up at the same time, only two of them are actually heating up. This means I have to turn the...