THESE FLOJET PUMPS WORK GREAT. I RUN MINE 7 HRS STRAIGHT TO PUMP WATER THRU 300 FEET OF BLACK SEARS GARDEN HOSE. A 45 WATT SOLAR PANEL POWERS THE PUMPS TO CIRCULATE WATER FROM MY HOT TUB. AT THE FLOJET GPM RATE I CAN HEAT MY TUB TO 108 DEGREES IN THREE DAYS FROM 68 DEGREES TO START. SAVES ME AT LEAST 80 DOLLARS A MONTH