How do I connect a boiler to the EWC wiring centres?

This applies to both 230V and 24V EWC-1 wiring centres: 230V boilers – Link terminals L2 (‘pump’) and NA (‘boiler’). Terminal C (‘boiler’) can then be connected to the boiler switched live terminal. Low voltage (e.g. 24V) boilers – Take the low voltage output from the boiler and connect to NA on the wiring centre. Terminal C can then be connected to the low voltage input terminal to energise the boiler.