Watercycles - Drain Water Heat Recovery
What is drain water heat recovery?
Drain water heat recovery (DWHR) is the practice of recovering the thermal energy we throw away down our drain particularly during a shower. The Watercycle is a water to water heat exchanger designed for use with drain water.
Water is the most expensive natural element to heat and carries a significant amount of energy. Any hot water that goes down the drain carries away energy with it. That's typically 80-90% of the energy used to heat water in a home. Drain water (or greywater) heat recovery systems capture this energy to preheat cold water entering the water heater or going to other water fixtures.
How it works
Water enters the home cold, is heated in the hot water heater and you take a shower around 41C (100 F). This water then goes down the drain. We can pre-heat this water from 5-25C (40-70F) before it hits the hot water heater. This will double the output of the hot water heater and cut cost in half.