Climate change is arguably the greatest challenge faced by humanity. Global greenhouse gas emissions from fossil fuel use continue to grow each year, despite attempts to limit them through mitigation and energy efficiency measures.
A tall cylinder contains a heat pump in the top third and a water tank in the lower two thirds. Warm air flows into the heat pump and cold air flows out. Cold water flows into the water tank and hot water flows out. The unit has an electronic controller which is connect to a wall power socket.