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I know, it's true, I'm being pedantic. It's the way it feels so hot to touch when off that it appears very wasteful but in reality it's pretty insignificant. Thanks for everyone's input. It's been a useful learning experience. Martin

I now know I'm making a fuss unnecessarily as it is meant to work this way. However I do like the idea I can power it down when not in use. My heating and water both go on in the evening only, so most of the day it isn't being used and could be resting (yep - the hot water does last that long...

I don't see why it wouldn't work. If I turn off the programmer at the mains the valve returns to rest. I then turn the power back on, grey is still powered but the valve remains in rest. Martin

Very true, it won't be a problem in the Summer!

You're right it doesn't work :( I'm just surprised the programmer doesn't make all the wires 0v when both heating and hot water are turned off. Surely that would do the trick. It's tempting to put a push-to-break switch inline with the grey wire so I can press it before going to bed to...

Thanks for the info. It's surprising how such a simple circuit can be so complex. It's also surprising how hot a 6W motor can get; I don't think I'll start drilling holes in it. I'm wondering if my programmer is not working as expected. When the hot water and CH turn off the programmer leaves...

Upon further investigation, the Power Head remains in its last state when no longer needed. So if heating is on and the motor is therefore powered up, when the heating turns off the boiler goes off but leaves the motor in its heating position thus taking power and heating itself up. In the...

I have a Honeywell "Power Head For Motorized Valve" 240V which operates fine. But the motor inside gets very hot - too hot to touch even when the boiler is not in use. It's in the off position (i.e. hot water only) so I'm surprised it would be taking power. The connecting water pipes are nearly...