Backer Cotherm Vertical Tsdr Thermostat 18" Resettable 13103 ST-425

This is a vertical 18-inch resettable thermostat, sized for use in immersion heaters. It is designed to control water temperature within hot water cylinders, providing an accessible means for monitoring and adjustment on site.

Suitable for many common domestic and commercial installations, the unit allows for easy resetting when required. It’s typically fitted by heating engineers during new installations, repairs, or thermostat replacements in electric immersion water heaters.