Tag: HRT4-B

Horstmann (Secure) HRT4-B Digital Thermostat The HRT4-B is a battery-powered electronic room thermostat designed to provide optimum comfort with close control of the energy used to heat the home. The HRT4-B will only operate when 2 x AAA batteries have been fitted and the thermostat is wired into your central heating system. INSTALLATION AND CONNECTION…