radiators warm at the top but cold on the bottom


Postby tfella » Wed Nov 26, 2008 9:03 pm

My radiators are cold at the bottom yet warm at the top. This problem is usually the opposite way round so do they just need bleeding?
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Postby plumbbob » Sat Nov 29, 2008 12:02 pm

No. This is caused by an insufficient flow of hot water to fill the whole radiator. Hot water rises as it enters the rads and sinks as it cools. Bleeding will make no difference.
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Postby htg engineer » Sat Nov 29, 2008 12:12 pm

No, if they needed bleeding then they would be cold at the top.

There's a problem with circulation or sludge. Try balancing the systrem to reduce the rate the water passes through the radiator, if there's no improvement then you need to remove the radiator and check the condition of the water.

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Postby chris_linney » Sat Nov 29, 2008 10:44 pm

remove the radiator flush it through with a garden hose jigle it about to rinse the sludge out and refit champion nowts abother
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Postby htg engineer » Sun Nov 30, 2008 12:19 pm

chris_linney - yes that is the DIY solution. But sludge in a system is not a good thing.

Nowts abother - but be prepared to do the same to the rest of the radiators in the near future, be prepared for pump packing up, heat exchanger becoming blocked, and poor performance from you system.

Clearing the sludge from one radiator is a temporary fix, you need to drain the whole system, refill and add cleanser, drain, flush more than once, refill, add inhibitor.

I know it's a DIY forum but if a jobs worth doing - it's worth doing properly.


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