boiler not working same after installation of a combi boiler

Question

hi, had a boiler installed recently and as a result living room radiator is cold on the bottom and very hot at the top. installer thinks is because radiator has both pipes on the same side, one at the top and one at the bottom so he wants to replace pipe to put it on the opposite side of the rad. i dont think the problem is with the pipes been on the same side of the rad as it is been working fine till now. I am looking for a second opinion, need help please.

Ravinder · Accepted Answer

Have you tried turning all other radiators off at the TRVs and leaving that one open and seeing if it heats up properly?

Then you can slowly open the others one at a time.. the ones that get hot quickly maybe don't open the valve fully .. it could just be that not enough pressure is getting to your radiator.

Greg · Answer

Usually it is the sludge that has settled down at the bottom, probably when he drained down the system. He should of gave it a quick flush, if he hasn't I would recommend giving your system s good flush to clean it.

Chris · Answer

Sounds like sludge in the bottom of the rad 
If the radiator is hot at the top 
If the radiator is piped top and bottom on one side it may be that there is a spreader pipe in the bottom connection which is blocked

Robert · Answer

If your installer has done a short chemical flush it may just have moved some sludge/debris to that radiator so may just need a proper flush through or the rad taking off and cleaning out with a hose to clear the sludge, the pipework wouldn’t affect performance unless the heat is coming in on the bottom valve as hot water, as with air is lighter than cold so will naturally rise to the top

Paul · Answer

Radiators piped just on one side are notoriously difficult to balance and I can  understand your engineers wanting to update this. Without knowing what system you had before it is difficult to advise more. Modern boilers are designed to work with thermostatic radiator valves and it is actually a requirement under building regulations for them to be fitted when a heating system is updated. 
I would have advised this and recommended pipe work to the radiators that are piped on one side be updated. 
Hope this helps.

Zirkie · Answer

It seems the installer has mixed the flow and return pipes.

Joseph · Answer

Did your installation come with a power flush? If not, I would suggest that the dirt in the system has settled at the bottom of your radiator when the system was drained for installation. Now that you have turned it back on the water is simply passing over, heating the top and ignoring the bottom. might be worth removing that radiator and giving it a manual flush in the garden or bathroom with a hose. See how you do with that.

boiler not working same after installation of a combi boiler

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