... meter, pressure gauge, pumps 2.sp24 solar hot water working station:*OEM*SOLAR KEYMARK,EN12975 TUV*5YRS WARRANTYMain functions1. ... Power of controlled pumps (temperature difference circulation pump, water-using end circulation pump):600W6. Electrical booster power:≤ ... electrical booster, temperature difference circulation pump and water-using end circulation pump) solar water heater working station