Horstmann are now known as Secure ControlsHRT4B Digital Thermostat with TPI Replaces obsolete DRT1 TPI energy saving software (adjustable for Gas Oil and Electric systems) Backlit Display ..

Horstmann are now known as Secure ControlsHorstmann HRT4ZW Digital Thermostat with TPI   HRT4-ZW - Wireless Z-Wave electronic room thermostat and ASR-ZW receiver TPI energy saving sof..