I have a 400+ year old house with 4 foot thick granite walls and solid slate floors. Yesterday the oil central heating engineer told me I need a new boiler as mine is over 30 years old so have decided to start from scratch. I can't have this or that because of the build of the house so have asked an engineer from our local renewables company,who did my solar panel 5 years ago, to come out and look and tell me what will work and what won't. It's probably the easiest thing to do. He's coming Monday so watch this space.