rads hot at top cold at bottom


Postby phill » Thu Dec 20, 2007 8:01 pm

new combi and rads fitted sept.. heating was never efficent to start with ie on full was not mega hot .. bled rads loads of times had my installer (corgi reg) back twice he balanced rads , since then they have got less efficent on maximum touchable at top bottom barely warm..been told it probably needs a powerflush?? is this correct anyone.. how much should i expect to pay.. my self employed plumber working away so unavailable.. does anyone know if i leave it aweek until my plumber gets to me, could it damage my system in worried it will clog up and damage my boiler?????? :(
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Postby htg engineer » Fri Dec 21, 2007 5:16 pm

If they haven't taken a radiator off the wall and they're telling you, you need a system flush I would get someone else out to have a look.

There's far too many people (probably plumbers - not heating engineers) stating that systems need a flush when they don't - that's because it's a easy job and you can charge quite abit for your time and chemicals. where all the radiator valves renewed too ?

It could be a fault on the boiler,

is the pump running efficiently ?

Is the diverter valve or boiler heat-ex choked or not operating properly ?

Does the burner cut out, is this why it's not heating properly ? could be the central heating sensor cutting the boiler off too soon.

If the boiler is only 2 years old and the inhibitors were added then this shouldn't be happening this soon - unless the system has been drained since and the inhibitor wasn't replaced.

If the old pipework was left in - this should have been flushed when the new boiler was installed.

Hope this helps.
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