hot radiators when hot water only is on ,on a combi system

[robert67]

Hi ,

the last rad to boiler gets hot when heating is off,I think its the boiler is purging heat to rads to stop pressure build up.<but I could be wrong>.
I was going to try and fit another small rad in a cupboard or hall ,as the last one at present is in my young childs room and it gets red hot in summer. Can I t- joint into pipes feeding existing last rad and feed another small rad off it .
Would appreciate any advice

Thanks

 

[GeckoGas-com]

Get a CORGI in; you'll probably need a new diverter valve depending on the combi model.

 

[Fluffster]

In ref to your adding on a rad question no probs teeing off if the run is short in 15mm pipe.
Have you balanced the rads see the wiki for details if not.
Pete