Protecting the boiler with a Relay

[ShaunCorbs]

Just a comment that the isolating the boiler from its supply should also isolate the contactor and if this is not the case there should be durable warning notice(s) so it is clear that both boiler and contactor supply need to be isolated for the system to be safe . (IET Regs 17th Edn §537.1.6)

Only if it's inside said boiler eg if you fitted the contractor inside the boiler which i strongly recommended you don't, but label the contractor as dual supplies if you want

And tbf since the pump load is low and doesn't require its own 5 amp circuit you could combine the two isolators into one and down to 3 amp

 

[KettlePilot]

Just a comment that the isolating the boiler from its supply should also isolate the contactor and if this is not the case there should be durable warning notice(s) so it is clear that both boiler and contactor supply need to be isolated for the system to be safe . (IET Regs 17th Edn §537.1.6)

The Contactor is located in a plant room out of bounds to unauthorised personnel and all electrical switch gear is contained within a pre-fabricated housing with clear warning labels/notices attached.


Good point BTW