The Original & Most Efficient DWHRS - GFX Heat Recovery Systems

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Fig. 1 illustrates a typical, whole-house GFX Drain Water Heat Recovery System (DWHRS) plumbed for highest efficiency per the original GFX Patent (U.S. No. 4,619,311).

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WaterFilm Energy Inc.
Patchogue, NY 11772
631-291-5147, Fax: 631-730-3918

Fig. 2 illustrates a GFX cross-section and nominal operating water temperatures of a Model G3-60 (or S4-60) for incoming water temperatures found in three U.S. Climate Zones.
  NOTES: In order to match the energy savings of a
$530, 60-inch Model G3-60 GFX, a $920, 78-inch long Model R3-78 Power-Pipe is required. A slightly less efficient, 72-inch Model R3-72 Power Pipe is also sold by Home Depot for $914.40.* [See performance comparisons based on equations @ (pg. 3.)]
  For installations with height restrictions, a 30-inch long, $350 Model G3-30 GFX can be used. It offers 41% efficiency; about 6% more than a 30-inch Model R3-30 Power-Pipe that's rated @ 34.8%** and costs $560.
*   Prices in October of 2016
Tested according to CSA B55.1; the Canadian version of U.S. DOE standards
Virginia Power used to test GFX over 20 years ago.   

GFX-Installation Video

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