This is the heating system you want

My French brother-in-law was never able to explain to me - given our limited quotas of French/English - how his heating system worked, so I'm glad The Guardian has this article on the subject. It's a brilliant system, freeing us of over-reliance on fossil fuels and Johnny Ball Nuclear, and indeed cranberries.

Costs a lot to put in, but could pay for itself inside 7 years, which is nuffink in heating terms. My brother-in-law did it all himself, too, and yet is slightly embarrassed to know less about computers than me. I ask you!