Re: Fitting Thermostatic Rad Valves
it is contained in the best practice guide for domestic heating installations. its all to do with energy efficiency. if you are sending heating water round a rad when that romm does not request heating it is a waste. if you use a gate valve(usaually a lock shield in my experience!) then in high demand the boiler is heating water then wasting it round a small loop therefore an auto by-pass will be closed in such cases and not waste water.
boiler manufacturers are interested in making the system and boiler safe and therefore any by pass will do for them
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