hi,
I have a fully pumped gas CH + HW system, with a hot water tank. The tank has a topup immersion in the top, and a thermostat strapped to the outside, contacting the cylinder through a cut away in the foam insulation.
I also have E7 electricity which with offset washing machine + dishwasher works out fractionally cheaper if I can offset around 9% of total use. I'm experimenting with using the immersion for an E7 boost. My gas bill is very high and I think the efficiency of Gas heating of my water is compromised by too complex a layout and too many heated towel rails , also possibly poor insulation on the pipe runs
My question is regarding the immersion heater. I have noticed that if I turn it on after a while it appears to get turned off, or rather it is on but not drawing current. I can see this from one of those currentcost electricity monitors that measure the total mains. So If I get up at 6:00am and turn on the immersion, the house consumes around
3.5Kw, but after around 45 minutes it drops to around 400 watts.
I assume this is because the water is hot enough, and that is a good thing, but I'm curious what is doing that ? Is it the strap on tank stat ? If so the light in the immersion switch is still on ? Maybe there is a stat in the heater element itself ?
I'm not complaining, if the immersion cuts out when it's done it's job
- that's great , I'd just like to understand how .