Combined solar potable water & hydronic heating

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At-the-Bridge, Markesan, Wisconsin, copyright, Phil Manke, 2006


Water heaters consume 13% of all energy used in America’s residences and 6% of all energy in commercial buildings. This energy consumption is massive—heating water in only our homes and apartments each year consumes over 100 billion kWh of electricity (enough to light and heat more than 10 million homes); roughly 1 trillion cubic feet of natural gas (equivalent to over 100 days worth of imports from Canada); over 900 million gallons of fuel oil; and over 500 million gallons of LPG

Buildings account for approximately one-third of total primary energy use in the United States. In turn, heating water—in houses, restaurants, hotels, schools, commercial and industrial facilities, and other buildings—is a significant share of building energy consumption. Heating water consumes approximately 3.8 quads of energy each year; this is the equivalent of 19% of U.S. natural gas production.


3 D schematic combined DHW /single zone hydronic heating system
small home or green house


Contact us for more information on custom designing services.



E Mail: info@btfsolar.com


FAX: 1 269 236 6186

Tel: 1 269 236 6179

Backwards to the Future Ltd. ( BTF Ltd.)
POB 409, Fennville Michigan 49408 USA

25 July 06