The Grundfos Comfort B PM and BX PM pumps are designed for recirculation of domestic hot water in single- and two-family houses securing hot water instantly to all faucets. The pumps have a corrosion-resistant pump housing suitable for drinking water and are powered by a single-phase, high-efficiency ECM with permanent-magnet rotor. COMFORT B PM and BX PM meet homeowner requirements for continuous operation. COMFORT BX PM has a built-in isolating valve and a non-return valve (fitting). This ensures that maintenance can be carried out without draining the system. The non-return valve also prevents reversed flow during operation.