In the growing world-wide drive to save our environment, we offer two devices for waste heat recovery that lower heating costs and global warming.


How? Drainergy and HeatBank pre-heat the cold water for any type water heater. They are made with available materials using common equipment and assembled without heat or fasteners.


This is a big deal because, cold water takes the most energy to heat into the hot water everyone uses every day, in every building, everywhere, all life long totalling more than 350 billion kWh (DOE) (with Canada ~400b). At about $0.10/kwh that’s $40 Billion of heat and money which just drains away and adds to global warming.


In addition, in any time zone, like traffic, hot water is mostly used at the same-times-of-day (morning, noon, night). The longer the electric heater is ‘on’ the more heaters are ‘on’ together. At 4,500 watts each, this creates the well-known peak in power demand which is some 50 percent of your bill. When heated by gas, huge volumes of hot, moist, acidic exhaust create dangerous city smog while adding to global warming.


Drainergy plumbs in-line with an existing vertical or horizontal drainpipe from a single sink or a whole building. It works when fresh cold- and hot drain water are both flowing through as when showering or running a sink.


HeatBank has a special Drainergy inside a storage tank filled with the very fresh cold water destined for the water heater. Waste heat from all sources and at all times heats the cold water. Sources can include showers, air/gas exhausts, tubs, washing/drying appliances, heat pumps, ventilators, refrigerators, and more. The special Drainergy is designed with one-way-only-heat-transfer. This allows cold drainwater to also flow through without taking stored heat with it. A world first.


The two inventions (with IP) use plastic where there is no heat transfer so as to lower material costs. Plus our vented double safety wall is rolled from 99.9% pure sheet copper in full thermal contact for faster heat transfer and minimal pressure drop.


Drainergy has five components - A standard PVC tube with side water fittings, a standard copper drainpipe with a copper safety sleeve around it, plastic ring-spacers, and an O-ring. HeatBank adds a pressure tank and a unique convection valve.