New radiators cold at bottom

Question

Why might my new radiators be cold at the bottom but okay at the top? Other new ones don't have this problem

Stuart · Answer

This could be a combination of things, where they are located, is the pipe run long or correct size etc.

Rap · Answer

With the heating on, First close all radiators, new radiators one by one open slowly (you may have to bleed the radiators)when radiators that hot then move to next one with issue.

Please when you vent tge radiators please make sure boiler has pressure.

When the one that wasn't warm start working properly then open the rest of the radiators.

If same thing happen next day just vent the radiators. Should work 100%

Abubakr · Answer

More than likely the radiators need bleeding. 
Usually air will be trapped at the bottom not allowing water to enter which results in no hot water entering the bottom side.

Gerard · Answer

Sound like a bit of sludge, turn all the other rads off apart from the one and turn your heating on for about 1 hr 
see if that clears it

David · Answer

Circulation and pipe sizing possibly not correct especially if you fitted contemporary rads or the old fashioned colum rads . Also microbore piping can cause it to if incorrectly balanced out

Deane · Answer

It could be trapped air in the rads which can be bleed to release the air and if that doesn’t work you’ll probably need a power flush to remove any dirt sludge and debris which is stopping the circulation of water in your rad hope this helps

New radiators cold at bottom

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