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Green Plumbing

Category - Caring for Our Planet

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All of the following are viable alternative water heater types except:

Solar water heater
Tankless coil water heater
Drain-water heat recovery system
Geothermal heat pump with desuperheater

Explanation

Answer: C -A drain-water heat recovery system can add energy efficiency by capturing wasted hot water heat to pre-warm water entering the water heater; however, it is not itself a water heater. Solar water heaters and tankless coil water heaters offer alternative water heater options, as does using a desuperheater with a geothermal heat pump to facilitate water heating.

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