Got an electric water heater in my flat, one of those instant ones. It outputs a low flow but this is alright as you mix the hot water with cold water in the shower. Problem is, in the summer you need to mix in too much cold water in the shower and the heater shuts down, probably as it senses low inlet pressure. If the house water pressure were higher, you would be able to push more water through the heater and it would not shut down. Will this be achieved with bigger pipes from the basement to the 3rd floor flat and to the shower? Or would that spoil the strangulation that is in place due to the internal diameter of the pipes being 1/2''?