On Saturday, 31 March 2018 14:47:18 UTC+1, Tim Lamb wrote:
My electrician is busy elsewhere so I am running the boiler in manual
mode.
It has crossed my mind to wonder about the impact of no overrun
facility. I suppose it would be easy to cycle the water temperature
setting to something lower than the current 50 deg. C and then switch
off.
I am not noticing any *kettling* or other noises.

Any thoughts?

If there's no kettling there's no problem. If you turned the boiler stat up or the pump down kettling might occur. You're just not getting the last bit of heat out of the HE by not overrunning. Though why overrun times are routinely set to minutes I don't know.


NT