www.pmmag.com/articles/91330-hybrid-water-heating
Hybrid Water Heating
January 1, 2008

The EternalĀ® GU32 is a hybrid water heating system that uses patented counter-flow design and two-pass heat exchanger technology. It maintains an 86 percent thermal efficiency rating with consistent pressure. This clean gas-burning appliance emits only 5ppm NOx. Offers plumbers ease of installation, and is PVC ventable.
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