The Honeywell Home L641A1039 cylinder thermostat is an essential component for regulating domestic hot water systems. Designed specifically for surface mounting on hot water cylinders, it accurately monitors and controls the water temperature to ensure optimum safety and efficiency. This highly versatile unit can be used to directly switch wet central heating circulating pumps or operate boiler zone valves. Its robust construction and proven reliability make it a staple for heating engineers conducting unvented or vented cylinder installations and routine maintenance.

Q: How is this thermostat mounted?

A: It is designed for direct surface mounting on hot water cylinders.

Q: What components can it switch directly?

A: It can directly switch circulating pumps or boiler zone valves.