DIY Doctor

Room stat is one needed with TRVs

Postby paulanliz » Thu Dec 18, 2008 9:29 pm

Hi am having a completely new heating system fitted and we are having TRV on all radiators the boiler will be a worcester bosch 27cdi so is it necasery to put in a room stat because with the old system we just turned it to full and let the TRVs do the work
Thanks
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Postby plumbbob » Fri Dec 19, 2008 2:30 pm

TRV's cannot be used to control the heating entirely as they only approximately control the flow of water through the radiator. A room stat is a necessity to ensure the boiler doesn't continue heating the water when the rooms are up to temperature.

Another point one radiator must be left without a TRV to act as a bypass.

I would strongly recommend fitting a programmable stat which will efficiently control the heating 24/7.
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Postby htg engineer » Fri Dec 19, 2008 2:33 pm

Yes, if you want the CORGI installation certificate. As regulations state there should be a room stat fitted on all new installations.

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Postby Steve the gas » Fri Dec 19, 2008 7:18 pm

As Htg,and the rad nearest the stat should not have a TRV on it also.
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Postby paulanliz » Fri Dec 19, 2008 10:27 pm

Thank you every one for your replies, a room stat will be fitted
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