Thermostatic radiator valves

[pjn32767]

I have new TRV`s and no room thermostat. I have three radiators without TRV`s fitted. I read somewhere that these need to be kept on all the time, why is that and do all three have to be kept on ?

[matt1e]

to protect your pump/boiler
u usually only need one that acts as a bypass (for when the other rads are off)so the pump is not pumping against nothing.but you can also fit an automatic bypass valve that does th same thing

[pjn32767]

Thanks - so in the winter when the radiators are on I can switch off the non TRV`s safely, but in the summer I should keep at least one on ?

[matt1e]

no not really as they the trvs could still all switch off if the place gets hot enough (unlikely in england I Know) so leave one on

[pjn32767]

Many thanks

Peter