ESI Mechanical Room Thermostat | Single-Zone Heating Control

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ESI Mechanical Room Thermostat — ESRTMSimple, reliable on/off temperature control for single-zone central heating systems. The bimetallic strip mechanism requires no power to opera te — it directly switches the boiler or zone valve circuit at the set temperature. The preferred choice where proven reliability matters more than programmability, and ideal for rental properties where tenant-proof simplicity is essential.Key Features Voltage-free switched output — compatible with most UK boiler wiring centres 10–30°C temperature range No batteries required — bimetallic strip operation Flush wall plate fitting — neat, compact installation Compliant with Part L Building Regulations when used with TRVs on all other radiators Suitable for rental properties and straightforward single-zone installations Technical Specification Model ESRTM Control Type Mechanical (bimetallic strip) Output Voltage-free switched Temperature Range 10–30°C Power Required None (no batteries) Mounting Flush wall plate Compliance Part L Building Regulations Application Single-zone central heating Show more