Horstmann Mains Electronic Room Thermostat HRT4-A

Horstmann HRT4-A — 230V Mains Operated Electronic Room Thermostat with Load Compensation

The Hortsmann HRT4-A is a mains powered electronic room thermostat designed for both new installations and replacement projects. Using advanced load compensation technology, it delivers more accurate temperature control than traditional mechanical thermostats, helping to reduce temperature swings and improve energy efficiency across a wide range of heating systems.

Accurate Temperature Control and Improved Comfort

With a temperature setting range of 5–30°C and control accuracy of ±0.5°C, the HRT4-A maintains a more stable room temperature, improving occupant comfort. Dedicated settings for gas, oil and electric heating systems allow the thermostat to respond correctly to different system characteristics, minimising overshoot and unnecessary boiler cycling.

Energy Efficient and Boiler Plus Ready

When installed alongside a suitable time control, the HRT4-A is Boiler Plus compliant, supporting installers in meeting current UK efficiency requirements. Its modern electronic control can achieve energy savings of up to 10% compared with older thermostat designs, making it a practical upgrade for system refurbishments.

Simple Installation and Wide System Compatibility

The HRT4-A uses an industry-standard wall plate and fixing centres, making it quick and straightforward to install as a replacement for older thermostats. It is suitable for most domestic gas, oil and solid-fuel heating systems that operate via a 230V on/off control signal, and integrates seamlessly with Secure programmers and zone valves.

Key Features of the Horstmann HRT4-A Electronic Room Thermostat Include:

• 230V Mains Operated Electronic Room Thermostat For Reliable Hard-Wired Control
• Load Compensation Technology For Stable And Accurate Temperature Regulation
• Wide Adjustable Temperature Range From 5°C To 30°C
• High Temperature Control Accuracy Of ±0.5°C For Improved Comfort
• Boiler Plus Compliant When Used With A Suitable Time Control
• Clear Back-Lit Digital Display For Easy Temperature Adjustment
• Set Temperature Display With Actual Temperature Shown On Dial Press
• Industry Standard Wall Plate And Fixing Centres For Easy Replacement
• Compatible With Gas, Oil And Solid-Fuel Heating Systems
• 7 Year No-Quibbles Manufacturer Warranty

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