Is your bathroom rad permanently on?

[presta]

When my system was installed in around 1982, the bathroom radiator was left with no TRV because old boilers had no bypass valve in them. That means if you put a TRV on every radiator and they all closed at the same time, the pump would be damaged trying to push water into a blocked pipe. Nowadays boilers all have an internal bypass valve to relieve the pressure, so you can put a TRV on every radiator without damage, which is what the plumber did when he installed my combi boiler 9 years ago. If you don't have a boiler with a valve, you don't need a new boiler, just a separate bypass valve.

 

[ianrauk]

That's brilliant logic, you get a hot towel even if you don't want it, you get a cooler shower, more water wasted, and no control over the system unless you call in an expensive plumber and then have to redo part of the bathroom.
The absurdity is amazing.

Not really. We just turned the rad off when not needed. And when it was on it had no effect of the temperature of the shower

 

[fossyant]

Yes, only when the motorised valve has failed. Are you a tank and standard boiler (not combi). If our radiator in the bathroom comes on, the motorised valve that switches the circuits, fails or sticks this happens. If you have one, you can change the little motor unit yourself and a genuine one is about £25. The last time this happened, someone had piled way too many towels down the side of the hot water tank, which restricted the valve.

 

[fossyant]

You may have one of these next to the hot water tank

https://www.screwfix.com/p/honeywel...UsEHA-CPqGdWdbXbGUNsBxKbsvoecA1YaAgvKEALw_wcB

 

[fossyant]

I replaced the synchronous motor inside the box. Easy. Don't get the Amazon specials.

https://www.screwfix.com/p/drayton-synchronous-motor/28670

 

[fossyant]

I say easy, the issue is usually access and all the stuff in the airing cupboard. Having a spare monkey or Mr Tickle arms helps. Age does not.

 

[Pat "5mph"]

No, only when the heating is on

Same here, combi boiler.