These tiny, brushless, magnetic-drive circulators can be driven by PV modules or 12 volt batteries for closed-loop circulation in solar water heating systems, individual space heat zones and individual loop radiant floor loops. Use of several small pumps in a radiant floor system allows each loop to be controlled by a different thermostat. Model SID 10PV-12 is designed to be powered by a 10w PV module, in open loop systems and can pump 3.3 gallons per minute at no head and 1/2 gpm at 2.5 feet of head at 17 volts input. A 20 watt module should be used for glycol systems. It can circulate water in a well designed solar water heating system with two 4 x 10 collectors. Model SID10B-12 is designed to be battery powered andhas the same specifications at 12 volts.
EL SID Circulation Pumps 
These tiny, brushless, magnetic-drive circulators can be driven by PV modules or 12 volt batteries for closed-loop circulation in solar water heating systems, individual space heat zones and individual loop radiant floor loops. Use of several small pumps in a radiant floor system allows each loop to be controlled by a different thermostat. Model SID 10PV-12 is designed to be powered by a 10w PV module, in open loop systems and can pump 3.3 gallons per minute at no head and 1/2 gpm at 2.5 feet of head at 17 volts input. A 20 watt module should be used for glycol systems. It can circulate water in a well designed solar water heating system with two 4 x 10 collectors. Model SID10B-12 is designed to be battery powered andhas the same specifications at 12 volts.