You can get little 12 volt hot water pumps that will run straight of a solar panel if you search " Brushless Water Circulation Pump 15W Solar Hot Water " ( ebay of course ) come in 5w and 10w as well or run of a car battery , ( no electric shocks ) . Im nutting out a system of useing a polypipe coil set up permanant for solar water heating in summer and potential compost heater winter time (South Australia) to feed pretty hot water into my existing hot water service . Might start a thread .
If you always do what youve always done thats all you will ever do !!!