Skye has an interesting electric on-demand hot water heater unit that’s small enough to fit under a kitchen sink. The Paradigm applies a technology they call HeatSurround. It’s a way of heating water by passing it through the heating element rather than immersing the element in the water. As a result, the unit produces about 24,500 BTUs of heating power, and can raise water temperature by 40 degrees at a 1.2 gpm flow rate. In other words, it can supply endless hot water for a shower or dishwasher or washing machine.
www.tankless.com/