Salus RT520RF Wireless Programmable Room Thermostat & Receiver Review

The Salus RT520RF is a digital wireless thermostat kit consisting of a battery-powered transmitter and a mains-powered receiver. It is specifically designed to meet UK 'Boiler Plus' regulations, which require modern heating systems to include advanced controls like load compensation. Unlike cheaper alternatives, this model supports OpenTherm, allowing it to communicate directly with compatible boilers to modulate their output rather than simply switching them on and off. This results in more stable indoor temperatures and less wear on the boiler components.

In a typical UK semi-detached home, the wireless range of the RT520RF is generally reliable, though performance can dip through thick Victorian brick walls. The large LCD screen is easy to read, but the menu logic for setting up 7-day schedules requires a brief look at the manual. The 'landlord mode' is a useful addition for rental properties, and the wireless nature means you can position the thermostat in the most relevant living space without chasing cables through walls.

By utilizing the OpenTherm load compensation, users could realistically see a 3-5% reduction in gas usage compared to a standard mechanical or basic digital thermostat. In a typical UK home spending £1,200 annually on heating, this could equate to a modest saving of £36-£60 per year. These savings are achieved by preventing the boiler from constantly firing at maximum temperature when only a small boost is needed, though the actual figures depend heavily on your boiler's compatibility and your home's insulation levels.

The receiver requires a 230V mains connection, so professional installation by a Part P qualified electrician or gas engineer is recommended. The wireless pairing between the unit and receiver is pre-configured at the factory, which simplifies the commissioning process.

Running costs are minimal, consisting of two AA batteries for the thermostat unit (typically lasting 12-18 months) and a negligible amount of electricity for the receiver.