Image is for illustration only and should not be relied upon Secure (Horstmann) H3747WIFI Wireless Internet Control

Secure (Horstmann) H3747WIFI Wireless Internet Control

Ex VAT: £177.87
HCO Code: BU519
Availability:  In Stock

The new H3747 is a receiver / PTD unit (for managing up to 4 channels) which can control combi or system boilers. Out of the box it is wireless enabled and can be operated by an app. With the included Wi-Fi adapter, it can fully control your heating system outside of the home via the app.

Ideal for replacing traditional wired controls for systems that require separate control of heating and hot water or multiple heating zones. It is compatible with standard 9-pin backplate offered with our popular ChannelPlus, the programmer range can easily replace the H37 or H47XL with only minimum wiring changes.

It includes a load compensation algorithm that significantly improves boiler efficiency by preventing short-cycling and overshooting of temperature when used with programmable thermostat display (PTD). Load compensation has been shown to save energy compared to traditional systems, while maintaining more consistent comfort levels.


  • Easy replacement of timers/programmers
  • 3 or 4-zone system
  • Central heating and hot water control
  • Domestic gas or oil-fired boiler-based heating systems
  • 4-channel control with local override via button


  • Retrofit on many existing controls with convenient installation using 9-pin configurations on backplate
  • Click-off / Click-on with simple wiring changes for easy and quicker installation
  • 12 year battery life warranty on programmable thermostat display (PTD)
  • Worldwide remote control of heating via app
  • Boiler Plus compliant (load compensation and optimum start / stop)
  • 7 years no quibbles product warranty

  • 4 channels, 3A rated, volts free operation
  • Optimum start and stop
  • 9-pin backplate
  • Local override
  • Load compensation for efficiency and comfort
  • Service Interval reminder
  • Installer and user app (Android and iOS)
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