Solar Water Heating

Solar water heating works great, even in cloudy areas. Because water heating is the second largest energy load in most homes, just behind space heating, it will save you significant money while you help to protect the environment. According to PGE, every solar water heating system saves 1000 pounds of CO2 from the earth’s atmosphere each year.

Mr. Sun Solar installs in the Pacific Northwest and will offer technical support for installations anywhere in the world. We have supervised projects in Japan and India, as well as other parts of the United States. For most applications we recommend the Sol-Reliant system pictured right. Simple, elegant and highly efficient, Sol-Reliant is the most maintenance-free system available. It can also be purchased as a kit for “do-it-yourselfers.”

Many states have tax credits and incentives which pay half or more of the cost of installing the system. For questions or a consultation, please contact us.

How the Sun Heats Your Water


Solar water systems work by preheating incoming water so that your gas or electric water heater does less work, saving energy and lowering your monthly energy expense. A solar collector made of flat copper plates in a glass-covered frame capture the sun’s heat and transfers it to  is captured by a solar collector consisting of specially coated flat copper plates inside a sealed, insulated, glass-covered frame.

Mr. Sun’s system of choice, the Sol-Reliant water heating system, is a closed loop active drainback* system circulating a mixture of glycol and distilled water. The pump circulates the fluid through a solar collector, where it collects heat from the sun and then flows back down to a coiled heat exchanger in the solar tank. The heated fluid raises the temperature of the water in the water heater. One of the unique features of the Sol-Reliant system is that is uses a solar PV module to provide electricity to the pump, rather than sensors and a plug-in electric pump. The brighter the sun, the more energy sent to the pump and the faster the fluid flows. In weaker sunlight the pump slows down automatically, and stops completely when the sun goes down. The PV module control means less parts and zero household electricity usage, producing a very reliable, cost effective solution.

Open loop systems: Systems that circulate tap water directly through the solar collector.
Closed Loop Systems: Systems that circulate distilled water and/or glycol or antifreeze through the collector and a heat exchanger in the solar tank.
Active Systems: use a pump to circulate fluid through the collector.
Passive Systems: rely on water pressure and convection.

Contact us for more information on how solar water heating systems work.


Residential Sol-Reliant solar water heating system


Crane positions another commercial solar water heating collector on an apartment complex