DAB Cental Heating Pump available in 5 meter or 6 meter head. Three speed domestic circulator pump which are designed to automatically vent on the initial start-up and the manual restart knob gaurantees additional fast manual venting if required. 130 mm port to port dimension makes this ideal for replacing old pumps. B rated energy efficiency (5 Meter Head pump) C rated energy efficiency (6 Mete Head pump)