Hi...I know this is sometime later than your post but I was wondering if you could help....I'm thinking of buying a de Dietrich GTU C120 for about €8000 including installation. However, having looked elsewhere, boilers seem to be between 700 and 3000 euros. I just can't seem to fathom why the C120 is so expensive. I read a couple of bad reviews and some moderate but nothing extolling their virtues. I don't want to be a pain but you seem to be the only person I can find that's got one. Can you throw any light on what you paid and how much oil it uses and its reliability. Obviously any info/help would be greatly appreciated. Kind regards...Mike