GPD series of circulating pump researched and developed by scientific research personnel of our company has following merits: no leakage, low noise, environmental protection, beautiful appearance, convenient installation, run responsible and so on, lt is desig ned special for heating system and it can be used to supply water and add pressure for mansions of cityk, villa of suburb, house, to match with industrial equipment, to supply water in cycle for cooling air-condition, boiler and solar energy, supply hot water and keep warm in cycle, etc