Horstmann 4 Channel Smart Thermostat and Receiver H3747

Horstmann H3747 — Wireless 4-Channel Receiver with Programmable Thermostat Display

The Horstmann H3747 is a wireless receiver with programmable thermostat display (PTD) designed for advanced multi-zone heating control. Capable of managing up to four channels, it is ideal for combi or system boiler installations requiring separate control of central heating, hot water and multiple heating zones. It provides a modern upgrade path from traditional wired programmers while improving efficiency and user comfort.

Flexible Wireless Control with App Access

The H3747 is wireless enabled as standard and can be controlled locally using the Secure installer and user app on Android and iOS devices. With the addition of an optional Wi-Fi adaptor, users can control their heating system remotely from outside the home. Local override buttons on the receiver ensure manual control is always available when required.

Energy-Saving Load Compensation and Optimum Start/Stop

When paired with the programmable thermostat display, the H3747 uses intelligent load compensation to reduce boiler short-cycling and temperature overshoot. This improves boiler efficiency and maintains more stable comfort levels. Optimum start and stop functions further reduce energy waste by ensuring heating only operates when needed, supporting Boiler Plus compliance.

Designed for Simple Retrofit and Installer Convenience

Compatible with industry-standard 9-pin backplates, the H3747 can easily replace existing ChannelPlus programmers, including H37 and H47XL models, with minimal wiring changes. Volt-free 3A rated outputs support a wide range of domestic gas and oil-fired boiler systems, making it a versatile solution for system upgrades and replacements.

Key Features of the Horstmann H3747 Programmable Thermostat Include:

• Wireless Receiver With Programmable Thermostat Display For Advanced Heating Control
• Four Channel Operation For Heating, Hot Water And Multi-Zone Systems
• Load Compensation Technology Improves Boiler Efficiency And Comfort
• Optimum Start And Stop Functions Reduce Energy Consumption
• Local Heating Control Via Installer And User App (Android And iOS)
• Optional Wi-Fi Adaptor Enables Full Remote Control Outside The Home
• Volt-Free 3A Rated Outputs Suitable For Combi And System Boilers
• Compatible With Industry Standard 9-Pin Backplates For Easy Retrofit
• Local Override Buttons On Receiver For Manual Operation
• 7 Year No-Quibbles Manufacturer Warranty

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