BTU-meter Displays for Typical Residential Showers

GFX can feed back lots of shower power, with big energy savings in all three modes of operation as illustrated by the computer displays shown below for the Model G3-60.  The computer displays show drain, hot and cold water flow rates, temperature readings/differences taken at coil/drain inputs/outputs. Power transfer in kW & Btu/hr is shown for 3 cases to illustrate performance for typical showers wherein the user controls the water mix and causes the drain water to hover around 95-degrees F. (See Installation Drawings & Performance Curves/Tables)

Larger version (140K)

Equal-Flow Mode always offers the highest operating efficiency [64.5 % in this example] because the maximum amount of cold water is routed through GFX's coil to make the coil and drain flow rates equal. This mode is generally the simplest to implement in millions of homes by simply rerouting the cold water supply to flow up GFX's coil. (See this description and illustration for more details.)

Larger version (167K)

Shower-Only Mode offers 49.9% savings for this example, with preheated water feeding only the shower; not the water heater too. [NOTE: The coil flow rate is only 1.6 GPM as opposed to 2.6 GPM flowing down the drain.]

Larger version (170K)

Water Heater-Only Mode offers 40.2% savings for this example, with preheated water feeding just the water heater. [NOTE: The coil flow rate is only 1.1 GPM as opposed to 2.6 GPM flowing down the drain.]