circulating solar pump

am looking for advice on getting a solar pump-- heres my project-- 30 gl. solar panel on roof. 30 gl.hot water tank 10ft. below it. am looking for a small solar pump with a solar panel (sized for it) to merely circulate the heated water from panel to tank. living in oregon the pump will run with the sun and stop when its gone. any suggestions on where to find these? thanks brett
Comments
Something like these? See: http://store.solar-electric.com/water-dankoffsp-hotwater.html
HTH,
Jim / crewzer
thanks jim