It states in boiler manual "any additional equipment connected to the boiler must not have a separate electrical supply"
Thanks all for your comments, very informative.
Thanks but are you sure about the link? I have no link on Siemens and while I was investigating this I read about a few people who have blown their boilers with incorrect links.
Boiler is a Combi Worcester Bosch Greenstar 30i
Hi,
I'm replacing my Siemens for a Smart Drayton Wiser hub and need some assurance that I have wiring correct, The Siemens is currently connected with 4 wires Blue to Neutral, Brown to Live, Black to L1 and Grey to LX, see attached pics.
The Drayton Wiser hub back plate will have Blue at N...