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Solar Water Heating


Throughout the day the sun heats cold water circulated through a 31-gallon solar water panel mounted on the roof. The solar panel delivers hot water to an electric tankless water heater ( TWH ) by preheating the cold-water flow into the TWH.

The on-demand Stiebel Eltron Tempra 24 Electric Tankless Water Heater ( TWH ) supplies hot water instantaneously on demand to shower baths and sinks, eliminating a water heater & tank, and reducing natural gas usage. The TWH also lowers its electrical power use by drawing pre-heated hot water from the rooftop solar panel rather than heating cold water from scratch.

The on-demand Argo AT-1226 Electric Boiler ( Tankless ) heats water in pipes in the slab foundation to provide radiant heating for the house. A setback thermostat controls the settings to a peak of 60o for heat during the day and evening, and 55o degrees during the night. Combined with roof and wall insulation, the ambient temperature in the house is a comfortable range from 65o to 72o year-round. Even on the hottest days the temperature does not exceed 80o.


Equipment & Service Vendor & URL
Solar Water Heating Alten Solar Products, Mountain View, CA
Solar Water PanelsProgressivTube
Water Heaters Stiebel Eltron Electric Tankless Water Heaters
E-Tankless Water Heaters Corp., Kamloops, BC, Canada
Radiant Heat Products, Victor, NY

Resources & Links