We’re fully certified to fix or inspect S, Y, W & C plan boiler wiring systems, unlike many traditional electricians.
Central heating systems will differ across properties, but the vast majority of domestic installations in the UK will incorporate either a ‘Y plan’ or ‘S plan’ style of system.
A Y plan uses a mid-position valve to direct the primary flow through the heating circuit or hot water circuit (or both), while S plan installations normally make use of two separate zone valves for both the heating and hot water functions.
Check the various types of system here.