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INTRODUCTION. INTRODUCTION. This thermostat can replace most common residential thermostats and is designed to be used with electric, gas or oil heating Manual Issue No. IM-T105NP-002 RF Programmable Room Thermostat Warning - Please read this manual prior to installation or use. Shock Hazard This unit must Manual for Horstmann HRFS1 Thermostat. View and download the pdf, find answers to frequently asked questions and read feedback from users. HORSTMANN. Day of Week. Indicator dential thermostats and is designed to be used with elec- heater will be operated when the room temperature drops.The Horstmann HRFS1 thermostat is a digital programmable room thermostat that you can use to accurately set the ideal temperature in your home.