DIRECT PUMP SOLAR WATER HEATING

A direct pump system circulates tap water through the solar collector(s). These systems were first developed in the late 19th century and were in wide use up to the 1920's in Southern California and Florida. The systems are called open loop and are very simple, efficient and reliable. A single low head (3' to 12') pump circulates the storage tank water through the solar collector. The water is piped from the bottom or coldest part of the tank to the pump, then to the collector and back to the top of the tank.
In alternating current (A.C. or house current) systems the pump is controlled by a differential control. The control constantly monitors the tank temperature and the collector temperature and turns the pump on when the collector is hotter than the tank
water. When the collector is no longer hotter than the tank the control shuts the pump off providing complete automatic operation.

Direct current (D.C., usually provided by Photovoltaic systems) normally do not need a control if the pump, P.V. module and collector are properly sized. If there is enough sunlight for the P.V. module to run the pump then the collector should be hot enough to heat the tank water. When the sun goes down and the collector cools, the P.V. panel stops generating electricity to the pump.
Periodic maintenance is required if hard water with high mineral content is circulated through the collectors. If this is a possibility provisions should be made upon installation to be able to circulate a mild acidic solution (vinegar or intech 52) through the collector every three to five years to remove the mineral build up.

2021 Zearing NW, Albuquerque, NM 87104
e-mail: info@aaasolar.com

About us - AAA Solar has been distributing solar and wind energy products for over twenty two years. We have sold or installed over ten thousand solar and wind energy systems. We distribute a full line of alternative energy products including solar electric systems, wind turbines, solar hot water heaters, solar home heating systems, swimming pool heating systems and solar ovens. Many systems are available in kit form for the do-it-yourselfer. Our installation and service department is a fully licensed and bonded New Mexico contractor with plumbing, electrical and heating and air conditioning licenses. We install and service solar systems and high efficiency heating and cooling appliances throughout the state of New Mexico. We occasionally install and or service systems in neighboring states. Please call us or e-mail for more details.

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