Rads not heating up fully

[Dave Payne]

Spent a bit of time looking at the heating yesterday, fired it up and let it run for a good half hour, checked the rads and nearly all of them were deffo getting hot water running through them, just not heating the full rad, cold spots all over them.

 

My thinking now is the system will need a good flush out.

 

Question is, do you do the system as one, or would you tempty the system and do each rad on its own to ensure you get all the crap out?

[musicman]

If you can, isolate the valves at each end of the radiator. Then, with a shallow bowl ready to collect any water they contain, undo the union coupling (the big nut nearest the radiator body). Water will come out - but only the contents of the radiator itself. Once empty, lift the radiator off it's brackets and take outside. You need a fair amount of water pressure, but hold the rad so it is upside down and fill from the rad coupling at one end until the rad is full. Then watch what comes out the other end - usually lots of very thick black water! One it runs clean, turn the rad the right way up, allow to drain empty and do the exercise again. Once this rad is re-fitted, proceed to the next one in line and repeat the process.

Edited May 21, 2015 by musicman

[Dave Payne]

Have been reading up on the balancing act, will try that tonight first on the first rad and see what happens!