Radiators only getting warm not hot.

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8 Dec 2008
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Glamorgan
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United Kingdom
Hello Experts,

I have a Worcester Heatslave 9.24 BF combi boiler, with an open tank on the top. The boiler has the integrated programmer and a room stat that looks the same age as the boiler.

The boiler is situated upstairs, the hot water is great and gets as hot as you expect.

The radiators however only get past warm never banging hot and consequently not warming the house enough. All the rads (8 in total) seem to get to the same temp. With the exception of the one nearest the boiler which gets a bit hotter. When you turn the heating on the rads all warm up very quickly, but only to a certain point. When I open the bleed valves on the rads, there is no air and the water is clear.

The temp of the rads is the same if the the setting on the boiler is set to max and the room stat is on 30 degrees, never gets hot!!??

Any ideas, or help much appreciated. Thanks.
 
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Hi Diyisfun,

Yeah they used to get hot, only really noticed the decline with this cold snap, so I can not identify a significant change point.

Is DIY really fun??
 

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