• OPEN BOX: This product is a fully inspected customer return

PLEASE NOTE: This item is a customer return that has been fully inspected by the Lava team and carries a 30 day Lava guarantee or the manufacturer's original warranty (if applicable) - whichever is longer.

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 Horstmann ChannelPlus range including the H37XL and H47XL 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.