GFX Drain Water Heat Recovery Systems (DWHRS)

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

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Customer Testimonials
Joanne from Long Island, NY

"GFX was installed in September of 1998 and to my surprise I received a credit of $279 on my oil-company budget which ran from June ’98 to May ’99. We had a mild winter, which might account for some of the savings, but there are other benefits we continue to enjoy. After the installation of GFX, we were able to lower water heater temperature by 30 degrees to a much more comfortable temperature - no more burnt hands when washing dishes …"

Matt from Vermont

"My testimonial would be that my GFX allows me to increase the capacity of my 40 gal. LP-fired water heater which is being used to provide heat in a 2000 sq. ft. home and domestic hot water for a family of 4. Cool, huh? –Matt."

Comment by Many Satisfied Customers:
Why isn’t GFX required in all new construction?
Dianne Falk From Virginia

"The Faulk’s GFX was installed on 12/10/97 and was to be turned to the off position for the first three weeks. On 12/23/97 Diane Faulk called to see if I could turn the GFX on since she was having 6 relatives stay with her over the holidays. She expressed to me that having it on would give it a true test of how effective it could be with recovery time. At times there would be 6 or 7 showers all in succession. I agreed that it would benefit everyone to put it through a tough test. I went out on 12/ 23/97 and turned it to the on position. Diane was real excited to see how it was going to work. On 01/5/98 I returned to take readings and talked with Bruce Faulk about how it worked. He was overwhelmed on how it performed and said he would recommend it to anyone. The other customers are saying the same things also, including myself. It does make a big difference." ... "The benefits are endless."

Bruce Falk From Virginia
(February 12, 2004)

"I would like to strongly recommend GFX technology to any homeowner interested in prolonging the life of their hot water heater and ensuring sufficient hot water in any situation. … My hot water heater is now almost 20 years old.  I know the reason it has lasted so long is due to GFX.  The ability to recirculate hot water has meant the heating element does not need to work as hard.  I have done nothing special, other than to have this technology installed.  My neighbors have been forced to change numerous heaters, yet I save money, not only on heating, but also on not having to purchase new equipment. …I have also been extremely pleased with the amount of hot water this device provides.  On many occasions, I have had guests and family stay at my home.  No matter how many showers need to be taken, we never run out of hot water.  What a great invention! Everyone should have one of these.  It saves money, it prolongs the life of equipment, it provides fast and sufficient hot water, and helps the environment by using less electricity.  It has operated for over 7 years without a service call.  I urge everyone to get GFX."

  • Fig. 2 illustrates a GFX cross-section & typical water temperatures of a Model G3-60 for three U.S. Climate Zones when tested according to CSA B55.1; the Canadian version of U.S. DOE standards used by Virginia Power to test GFX over 20 years ago.

Installation Video

Utility Manager from Minnesota

"The preliminary results on our field study are very impressive." Minnesota Power’s Dean Talbott said he was seeing 35 to 40% less total water heating energy on the first round of comparisons.  Note: Minnesota Power once offerd a $100 Rebate for GFX in their Triple-E Program. One of their customers said: "It’s fool proof... The GFX is a no-brainer."

New Zealand Hotel Manager

"I would like to take this opportunity to express my complete satisfaction with the installation of the GFX water to water heat exchanger at the Wellington City YHA during November 1997 and the additional units installed during September 1998. The initial trial unit of an "S" Model GFX was installed on a common waste from 6 showers using 1110 liters of hot water per day. The data logged results showed a maximum temperature difference of 18 degrees Celsius [32.4 F] and an average of 14 degrees [25.2 F] which is truly outstanding. Translated into dollar savings, the single unit produced annual energy savings of $397.78 and an additional annual demand savings of $241.68. The total savings each year is therefore $639.46 and the payback was 1.12 years or 1.687 years including installation. Energy is my second biggest cost in running the hostel after labour costs and a payback of this magnitude is terrific! Last month ECOsystems installed an additional 4 GFX and I am already impressed with the results. Results from the before and after logging showed that, over a period of time where the occupancy was the same the water usage actually up by 7%, the cylinders were heating 24% less! I am convinced the GFX water to water heat exchangers are an exceptionally economical energy saving device and am happy to recommend them to anyone." (See

Roto-Rooter Manager from Ohio

"I have had my GFX unit installed for over a year. It has exceeded my expectations as to how much heat it would recover. During the winter the incoming water temperature is 48 degrees, the GFX unit I installed raises the incoming water to 88 degrees. The net result is my hot water expense has reduced from $22.00 per month to $12.00 per month. I installed the model S3-60, I piped it direct to the water heater…. feel free to use me as a testimonial on this product."; says John Winthur, Manager, Roto-Rooter Corp.

Engineer from Missouri (7/02)

"We have used plate and frame, and shell and tube heat exchangers in our processing operation. These were high maintenance, plugging up constantly. We switched to GFX units to resolve the plugging problems. They work! Our water heating system no longer has any trouble keeping up with demand. The GFX units have never plugged. The GFXs have been in for over 11/2 years; they are doing so well I’ve Forgotten about them."; says Jason Blankenship, Director of Engineering Meramec Group, Inc.; Missouri, USA; manufacturer of molded Polyurethane products. (Meramec uses flight-type dishwashers in the application discussed @

WaterFilm Energy Inc.
Patchogue, NY 11772
[email protected]

Made in the USA Exclusively
For Waterfilm Energy by GFXCO, Pawtucket, RI

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