radiators not heating

tottenhamcolin

hi , had a worcester bosch condencing boiler fitted 2 years ago and the house hasnt been as warm as when we had the old boiler. with the dial set at 6 the radiators can get very hot at the top but only warmish at the bottom.
the radiators dont need bleeding, have tried that and there is no air coming out, anyone have any suggestions apart from moving to the med area,


cheers

G_M

1) if rads get very hot at top, it'snot the boiler failing to heat water
2) if rads get hot at top, it's not air at the top!
3) most likely it's sludge at base of rads - was the system power-flushed when the new boiler was fitted?
4) could possibly be a pump issue, but again I'd expect the entire rad to be same temp
5) no,I'm not a heating engineer and have no idea what I'm talking about!

See also:

http://www.diydoctor.org.uk/projects/radiatorproblems.htm

http://www.theanswerbank.co.uk/Home-and-Garden/DIY/Question963951.html

macman

As above, the system may need a flush-was it not done when the new boiler was fitted? If not, then your warranty is probably going to be worthless, if it was a 5 year one.

Cardew

If it is sludge it will need an expensive power flush.

If you have minimal DIY skills, to test a faulty radiator simply close the valve at both ends and remove; obviously being careful of any oily water being spilt.

Take outside and run a hose through and see what sludge comes out.

Re-fit and see if initially the whole radiator heats up.

Not suggesting this takes the place of a Power flush, but might determine if one is needed.

Edit - just read the link in post#2 - would have saved this post!

ihatemyhouse

are you good a diy, do you have a hose pipe and a connect on your rads so they can be emptied

if so flush the system your self, take couples of hours, but most of that will be stood around drinking tea,