A Great pump for Solar water heating applications the pump is powered by a small solar Panel  [not included]and eliminates the need for complex controllers when the sun is shinning its pumping and when the sun is down the pump shuts off ,they are rated for 24 hour use if used in a different applications brewerys etc ,the housing is made from Chevron food Grade Ryton ,the threads are brass 1/2 NPT Flow rate is 3 GPM ,Max temperature rating is 230F,The advanced Magnetic drive design is perfect for most high temperature non flammable liquid transfer applications.