Can any1 help with my problem . I have a Icon combi boiler and want to fit a thermastat, I have been told and it also says in the book that i need a voltage free thermastat. Acording to the diagram in boiler manual u are not to use mains voltage on volt free contacts. But only able to buy from shop a stat with voltage free contacts, but has to have 230 volt feed too operate it. Can any1 help