Enjoying the comfort of almost endless hot water and saving energy at the same is possible. Save up to 40% on hot water bills. As a Passive House High-performance building supply you can get up to 3x more shower time with tank systems. Or higher flow rates with instantaneous hot water heaters. The ThermoDrain™ is the latest technology in Drain Water Heat Recovery. Its unique design provides outstanding savings that can be attributed to its superior performance and durability. With its exclusive features, the ThermoDrain™ is simply the best technology available today! Optimal for Net-Zero Energy Homes.