Want more water heated with electric.

[ericmark]

It's a two minute job, you were close enough to take a photo, no need to empty the cupboard.

Photo taken a long time ago.

 

[fourtytwo]

But all I wanted to know was if looking at picture some one could tell me if I could fit a longer thermostat rather than having to empty the airing cupboard and remove the old one and measure with a bit of wire, it seems the answer is no, so it is empty the airing cupboard to find out.

If it helps my stat is 17" (43cms) long in what looks like a pretty standard tank (32x18" / 81x46cms) BUT I don't use that stat, instead I have a thermal sensor buried in the insulation under the immersion flange.

There is a difference between heating with the boiler and the immersion that has troubled me in the past and that is with the boiler the hot water temperature cannot get higher than the boiler flow whereas with the immersion the temperature can rise infinitely until cutoff by a stat somewhere. I have found if that stat is to low down in the cylinder the hot water at the top can be very hot indeed so presently I compromise with the stat at the top and set to 60C at least ensuring nobody gets badly scalded when running water.

I also used to have an oil boiler gravity hot water system (in another house) but we controlled the hot water temperature with the boiler flow setting. We had no problems with the rooms being to cold in fact we used TRV's to stop them overheating. There are so many reasons different houses and people have different comfort perceptions it's probably another rabbit hole best left.