Late to reply, but nevertheless: More and more people I know have additional heaters in their water systems integrated.
So if there's additional power available and they don't want to give it away for free, they turn on those heaters and boost the temperature of the water that is used for showering etc.
For a four person household these things are around 200 to 300 liters, so you can put a few kWh in them that you can save a day or two later.
So if there's additional power available and they don't want to give it away for free, they turn on those heaters and boost the temperature of the water that is used for showering etc.
For a four person household these things are around 200 to 300 liters, so you can put a few kWh in them that you can save a day or two later.