Are Drain Water Heat Recovery Systems Worth It? Water heating accounts for up to 20% of total home energy consumption, ranking second only to space heating in terms of energy consumption. Drain Water Heat Recovery (DWHR) systems are an energy-saving technology that can reduce the energy consumption of your water heater by up to 25%.Firstly, The Piranha Drain Water Heat Recovery & Cooling System is a specialized water-to-water heat pump. Secondly, That recovers energy from wastewater and uses it to produce hot water.
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