ThermoDrain is one of the most comfortable energy efficiency upgrades you can make in your home. It recovers heat from your shower and uses it to preheat incoming cold water. No maintenance required, no moving parts. A simple, yet overlooked technology that is now code required in 2 Canadian provinces and used in all high efficiency homes to reduce the cost of heating water. The US Department of Energy and the Canadian Governments, Natural Resources Canada recommend ThermoDrain to reduce your overall homes energy consumption.