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Thats a great idea, the lockout neon could energise a relay to drive a motorised valve that will switch the second boiler on. I'm thinking of also adding a selector switch to choose which boiler can be manually switched by the S plan controls. Brilliant ideas guys, keep em coming. I intend...

Many thanks to you both for your replies. The cascade system is very similar to my requirements. :)

Hi I am trying to source a module that will give control of an S plan system connected to two boilers. The master boiler is fueled by waste oil but if this boiler fails I want to automatically switch over to my convential boiler to continue to provide heating and hot water to my home. Has...