The boiler adopts an environmentally friendly combustion method - full premixed combustion, and the gas and air are precisely adjusted and premixed in advance to ensure more complete combustion.
The boiler adopts a double-drum longitudinal "D" type arrangement structure; water, steam or steam-water mixture flows in the pipe; flame burns and flue gas flows outside the pipe, forming extremely fast steam-water.
This video shows you how to wire a Hive Hub into your Vaillant Eco Plus 831 Boiler ! Remember to make sure the mains supply is off and the wiring should only
Sundial RF² Pack 1 (Y9120H2009) contains: Wireless enabled timeswitch (ST9120C) Wireless room thermostat (DT92E) Ideal for adding a room thermostat to a combi boiler or an individual heating zone. Features Energy saving TPI control Wireless enabled upgrade
The evohome radiator multi-zone kit provides 4 wireless radiator controller heads allowing you to create up to 4 zones – one head per zone. Individual radiator controllers are also available. The HR92 radiator controllers use two-way communication with the evohome controller to ensure that commands are received and valves opened while maintaining boiler interlock.
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