Wireless thermostats for Baxi boilers can be purchased from any home improvement store, such as Home Depot. Most wireless thermostats, such as those manufactured by Honeywell or by Nest, are compatible with a Baxi boiler.
Wireless thermostats available in the United States and the United Kingdom that are compatible with certain Baxi boilers consist of a control panel, which is the actual thermostat, and a relay that directly affects the boiler after it receives signals from the control panel, as of March 2015. Wireless thermostats are typically programmable.
Any wireless thermostat is potentially compatible with certain Baxi boilers and does not specifically have to be a wireless thermostat intended for use with a boiler or, more specifically, a Baxi boiler. Nest, for example, specifies on its website that its Learning thermostat is compatible with most heating systems, such as Combi, condensing, system and heat-only boilers. The Nest Learning thermostat can be programmed via mobile devices, tablets or laptops.
Replacing a boiler's current thermostat or installing a wireless thermostat onto a boiler for the first time is a matter of wiring. It can be done professionally or by a homeowner. With the thermostat's user manual and the boiler's user manual at hand, installation can be completed in approximately an hour. There are even several video tutorials on YouTube.