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Product at a glance

The H3747 is a 4-channel smart programmer, which can control heat pumps, combi and system boilers, or even regular wired thermostats. Designed to supersede the ChannelPlus range by using the same wall plate with minimal wiring changes, whilst bringing connectivity features along the way. Out of the box, it is Bluetooth-enabled and works with a mobile app as well as the provided programable thermostat. With the optional plug-in Wi-Fi adapter, the H3747 can even remotely control your home heating system in a few simple steps. This unit is 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 the standard 9-pin backplate offered with our popular ChannelPlus making retrofits and new installs an easy task. This smart programmer can even control the schedule of an existing wired thermostat and is designed to be modular and expandable with extra sensors for more heating zones. There is no hub or gateway to configure and power for remote access; simply plug the Wi-Fi card into the front slot, provide the password via the app and you will be connected. The H3747 also includes many of the latest Boiler Plus energy-saving features such as optimum start and stop per heating zone, as well as on-off load compensation. This significantly improves boiler efficiency by preventing short-cycling and overshooting of temperature and helps to save more energy and improve efficiency.


  • Easy replacement of the ChannelPlus range
  • Combi or system boilers and heat pumps up to 2-zones
  • Central heating and hot water control
  • Control the schedule of existing wired thermostats


  • Uses a standard 9-pin backplate for easier retrofits
  • Click-off / Click-on with simple wiring changes for easy and quicker installation
  • 12-year battery life warranty on programmable thermostat display (PTD)
  • No Wi-Fi necessary for local control of heating via app using Bluetooth
  • Boiler Plus compliant (load compensation and optimum start/stop)
  • 7-year no quibble warranty
  • Energy Company Obligation eligible measure


  • 4 channels, 3A rated, volts free operation
  • Optimum start and stop
  • 9-pin backplate
  • Load compensation for efficiency and comfort
  • Service Interval reminder
  • Installer and user app (Android and iOS)
  • Local control by mobile app using Bluetooth
  • Smart control capability by Wi-Fi adaptor

Technical specifications

Number of channels 4
Relay input voltage rating (CH1 and CH2) 12V to 30V DC, or 230/240V (50Hz)
Relay input/output current rating 3A resistive /1A reactive (Max)
Supply (receiver) 230 V/240 V AC (50Hz)
Battery specification (PTD) Non replaceable 2x A lithium ion, 3.6 V, 3600 mAh
Battery life (PTD) ≈12 years
Insulation category CAT II
Software class Class A
Control type Micro-interruption
Design standards Product Standard: EN 60730-1, EN 60730-2-9
RED Radio: ETSI EN 300 328
RED EMC: ETSI EN 301 489-1, ETSI EN 301 489-17
Safety: EN 62311 :2008, EN62368-1 :2014
Dimensions (receiver) 107 x 167 x 36mm
Dimensions (PTD) 100 x 100 x 29mm
Weight (receiver) 161g (approx.)
Case material Thermoplastic flame retardant
Mounting 9-pin standard wall plate
Impulse voltage rating Cat II 2500V
Enclosure protection IP30
Pollution degree Degree 2
Operating temperature range 0 °C to +40 °C
Storage temperature -20°C to +70°C
Environmental humidity range 0 to 90%
Compliance Bluetooth BLE compliant
Operating frequency 2.4 GHZ
RF range ~60m, line of sight
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