Continuous flow hot water systems are small, wall-mounted units that heat water as you use it, rather than heating it slowly and storing it like a hot water storage tank does. They work by pushing cold water through copper piping, and applying heat directly to these pipes. When a hot tap is turned on, a flow sensor triggers a gas burner and starts heating the water. The water is heated to the set temperature and runs straight through to your tap. As they only operate when the hot tap is turned on, you’ll never run out of hot water.