We use a timer which turns hot water cylinder off overnight & starts at 9.00am which is the first free hour available. This will guarantee you get the full free hour. Sparky just fitted a timer in the fuse box inside. timer looks like a single circuit breaker. Simple to change time if required. Our savings with EK are averaging out over a full year at 15-20% by using Dryer. Washing machine & hot water during the free hour.