Canarsee offers all types of residential plumbing pumps from leading industry brands. In order to move water through the system at needed rate, pumps are used in hydronic systems. Necessary elements to recognize while purchasing a pump are GPM (gallons per minute), head range, voltage and horsepower. GPM (gallons per minute) is a measure that demonstrates the maximum flow rate of water that pump is allowed to distribute at a given head range. Head range is the number of feet a pump could maximize and minimize a column of water at atmospheric pressure.