I have few questions and would like to have some answers or feedback k... ? 1) So this storage heater will run 24hr? Then electricity bill will be high? 2) even got off switch if we off it, it will defeat the purpose of having hot water anytime when we switch on right? 3) thinking of install 1 25litre to support 2 bathroom, think is cheaper if we install 2 instant heater inside each toilet right?