1L/min Flow Switch for Heat Pumps

This water flow switch occupies a footprint of approx. 4 x 7 cm (1.57 x 2.76 inches) and combines a rigid plastic enclosure with nylon internals for resistance to thermal stress and chemical exposure. Electrical parameters: 100V operating voltage, 0.5A maximum current draw. Ambient temperature range: -10°C to 100°C; fluid contact range: -20°C to 120°C. Sensing mechanism covers 30–500 mm, allowing precise tuning to activate at 1 L/min — the critical minimum flow rate for safe heat pump operation. Installation uses a standard threaded connection, offering mechanical strength and sealing integrity without secondary fasteners. Rated for up to 1 MPa pressure — verify compatibility with your system’s static and surge pressures. Functions as a binary flow monitor: closes or opens a circuit when water movement meets the set threshold — directly interfacing with heat pump logic boards to enable automatic shutdown or alarm triggering upon loss of circulation. Validated in diverse UK-relevant applications: air-to-water heat pump primary circuits, solar thermal loop checks, domestic hot water recirculation, swimming pool heater protection, and commercial espresso machine boiler feed — all demanding zero-drift performance over years of intermittent duty.