Our cistern is a good distance from the washing machine, and dish washer, and the dish washer is near the sink, so if the dish washer uses hot water that means the pipes are pre-warmed so when we want hot water as the sink, it is there will less delay.
As with many appliances testing in an unheated warehouse is very different to using in the home. We see this with tumble driers, vented puts CH air outside, condenser using water uses more water, condenser using air gets the room hotter, condenser using a heat pump however does not waste heat from the house or heat the house up, and uses less electric.
We look at our electric and see
in this case 4.5 kW going into the grid, with a pittance paid for it, so at the moment electric costs around 9 p a kWh as I can't store it, but latter it will cost 4 times that as the batteries will not last over night. They stop at 10% so there is some left in case of a power cut, but my hot water never had so much, I get
I did not expect this, water was heated using oil, boiler would fire up 4 times a week for max half hour, but normally around 20 minutes, so around 30 kWh per week, winter no option can't turn water heating off, but I had thought with 3.5 kWh battery and 4 kWh in the water we would export very little. However that is not the case, and each day we start with a battery at 10%.
Next thing is get the shower to use hot water from the header tank, once we have the cash, the battery and solar can't power the electric shower, so that needs changing, mainly as all using same inverter.
But hot fill would save us money.
