GreenBack Waste Heat Recyclers for HVAC

    Waste heat recyclers are indoor plumbing devices that heat (or cool) water or air. They can pass waste water with or without solids.

    In some jurisdictions they are mandatory for new construction.


Currently available waste heat recyclers: 

  •     work only with showers and running sinks (not with dish- or clothes washers);
  •     are made entirely of expensive copper; 
  •     have a small thermal contact area and low thermal contact conductance that degrades; 
  •     are only for vertical use, limiting building type / size;
  •     create troublesome water pressure drop;
  •     are heavy to handle ad ship 
  •     are subject to terminal damage from crushed tubes from rough handling; and
  •     are non-serviceable

    all making for low performance, low margins, and low market penetration, even after 20+ years.

GreenBack Features 

    A patented hybrid construction uses lower-cost plastic to contain the water such that less copper is needed and, the copper’s entire surface area is in high pressure contact conductance with the drainpipe. The all-important rate-of-heat-transfer (Q) is therefore much faster.

    The result is lower cost and higher performance for faster payback and, in turn, wider market penetration, more money saved and more benefits to our planet.

  •     vertical and horizontal versions 
  •     can be made in various sizes, ranging from individual sink to an entire building
  •     requires no power or maintenance, and has no wearing parts
  •     double-walled and vented for safety and code compliance.


GreenBack Advantages

  •     made without weld or solder joints, adhesives, fasteners or expensive equipment  
  •     made from widely available materials using low-skill labour and processes. 
  •     minimal capital investment required
  •     low shipping weight
  •     inherently protected from handling and shipping damage
  •     can be disassembled
  •     commercialization investment widely available

Three GreenBack Models - Any Length Any Diameter

    1. Drainergy for sink and shower heat recycling. It replaces a section of the fixture’s drainpipe, or a section of the building’s final drainpipe, or both. 

    Drainergy transfers heat from the drainwater to the cold water feeding a faucet or water heater in what is known as ‘continuous flow heat recovery’.  

    Lowest cost for new construction, renovation, and energy upgrading. 

    2. HeatBank for all waste heat (or cold) from all water or air/vent/exhaust sources

    Replaces a fixture’s drainpipe, or a section of the building’s final drainpipe. 

    HeatBank is essentially a Drainergy with built-in thermal energy storage (or ‘cold storage’ for refrigeration).

    For the first time ever, waste heat from baths, dish- and clothes washers, as well as from the vents of clothes dryers, ventilators and flues can be recycled. 

    In a world first, this breakthrough invention automatically recycles all waste heat, either continuously/immediately (like a Drainergy), or by temporarily storing the heat until the next hot water use. 

    The breakthrough is that cold drainwater cannot cool the stored heat (or vice versa). 

    3. HeatClamp for sink and shower (known a ‘continuous flow’) for immediate recycling where cold water is entering the water heater (or cooler) while the drain water is flowing through the drain. 

    A HeatClamp fits over an existing drainpipe.   

    Lowest cost for renovation and energy upgrading. 

    It is essentially half a Drainergy that is simply clamped around any drainpipe while it remains in full use, One HeatClamp for the bottom half of a horizontal drainpipe, and two for a vertical. 

Photos, video, data, and detailed Know-how on fabrication available

 Prototypes available at reasonable cost

Patent numbers: CDN 2,927,158; 2,742,075. USA 9,982,950; 10,816,272 (Oct 2020)