Quote:
Originally Posted by Itshim
You must kidding 75c !!!: shocked:
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It's all down to how condensing combi boilers work. 75c leaving the boiler, but a lot lower on the return leg. I had it explained to me in a very techie way, and it made total sense.
But, and it's big BUT, Building Regs Part L changed again in June this year.
Now the system must be able to cope with 55c.
This guy explains it, but the writing on the screen is a bit off-putting.
https://www.youtube.com/watch?v=SbcVKU1QxJ4