OP
oldtimer
First of all is the immersion an off peak set up ie the tank heats up overnight on cheap or half price electricity. Plus you can switch the immersion on for 6 hours but remember its temperature controlled so say it takes 1.5 hours to reach setpoint temperature then it will only cycle on off as the temperature dips then it heats it back up again so you may use 1.8 hours over a 6 hour period.
Like central heating just because it is switched on does not mean its burning fuel
Like central heating just because it is switched on does not mean its burning fuel