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The HRT4-ZW unit is part of a system designed by Horstmann to primarily control a boiler, by sending Thermostat Mode SET commands or Binary Switch commands The HRT4-A is a 230 volt electronic room thermostat designed to provide optimum comfort with close control of the energy used to heat the home. The Horstmann HRT4-ZW thermostat uses the latest control technology to provide extremely accurate temperature control which will help to keep your energy Manual for Horstmann HRT4-A Thermostat. View and download the pdf, find answers to frequently asked questions and read feedback from users. The Horstmann HRT4-B thermostat uses the latest control technology to provide extremely accurate temperature control which will help to keep your energyRelated manuals · HRT4-A, HFT4 and HTT4 Mains Operated Electronic Room Thermostats · Horstmann HRT4A, HTT4 & HFT4 Thermostat User guide · Horstmann HFT4 Data Sheet.