Type 22 vs Type 21 radiators

New rads are thinner metal than old rads so heat transfer is quicker
Fair enough, but that doesn't seem to have anything to do with him having changed 21s to 22s - on the basis of what you're saying, the same would presumably have occurred had he replaced old 21s with new 21s, wouldn't it ?
 
lol common sense would say it should be a k1 if double double is k2
Lol - not just common sense but when actually knowing what they are and then actually thinking about it when typing would help!!

I guess thinking along those line though, then the rad between K1 and K2 shouldn't really be a P+, even though it stand for panel plus, maybe should have been a K1.5. Don't know why they added a new naming convention anyway. I think I'll just stick to Type **
 

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