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Ok UpgradeME I have now looked at that link you included and it appears that the low flow is low because the pump is pushing a 5m head. This is even width all rads off and the one only 1m away open full. Looks like a flow restriction in the boiler. Anybody had this problem with a linea...

Sorry The system was installed by a Corgi approved plumber. The system worked well when installed and rads and rooms were very hot all over. Main pipework is 22mm and this drops to 15 for the tails to each radiator. (Each 15mm pipe only ever feeds 1 rad) Problem has been getting...

I am getting a temp difference of around 40 degrees at 500l/hr From that would you then think i have a flow restriction probably in the boiler.

It is the Linea Max i have not the HE condensing version. Not sure where i would find/measure/calculate the actual power output range of the boiler. It does appear as through the burner only has two modes on full or off. When it comes on it lifts the water temp by 40 degrees. If i turn the...

I've fitted a new pump and it is at the third speed setting and this made no difference. Also new diverter valve. I presume you thiunk its a blockage of some sort. Isolating all radiators apart from the one 1m from the boiler i still get this low flow. I can then see all pipes to from the...

Central heating output of the boiler is from 9.9 - 28.0kW Designed temp rise 20 degrees Minimum flow rate for heating is 360 l/hr

Thanks Agile My house is four bedroom detached property with high ceilings and single glazed windows. Its very drafty and a b*gger to heat. I have 17 radiators and a towel radiator. I had been thinking that there may have been a problem with the self-modulation on the gas supply to the...

It has recently had a new diverter valve. Does the flow seem rather low to you. I was thinking of temporarily connecting some new pipework to another single radiator to check the flow rate and flow/return temps. This would then see if the problem was the boiler of the pipes. Does that...

I have isolated all rads but one and still cannot get the return temp up enough to 20 degrees below the feed.

I have had this done and didn't make any difference. I also installed a brand new radiator when i replaced the return pipework and this had the same problem immediately even although it defo had no sludge in it.

Looking for help and am really getting desperate now. I have had a problem with my heating system for a few years not and it is gradually getting worse. The top of radiators are hot and the bottom is cold resulting in the rooms not being adequately heating in the cold months. Boiler, rads...