Radiator pipework when changing from type 21 to 22

19 May 2007
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United Kingdom
I need to increase the btu for a radiator at my sons house and was thinking of putting a size 22 rather than the existing size 21. Is it just the fins that are doubled up and no other difference ? I'm trying to work out if the pipework needs to be changed as it'll be awkward as they have lvt flooring.
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If the pipework is big enough it's big enough for a 22.

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