Next to the standard 50 gallon water heater is the furnace plenum. You can
see the water lines carrying water into the plenum where it goes through a heat
exchanger to help heat the house. These lines carry water from the solar hot
water system into the furnace and back to the 150 gallon hot water tank.
Questions and about the Gridless Urban House, its energy-efficient
technologies, and alternative-energy solutions may be directed to
questions@gridlesshome.com