so in that case Worcester have said its advisable, yet no where is it a regulation as i thought. it is just basingstoke towers spouting off bull as usual.
and for the record i fitted an Ideal Evo boiler 3 years ago on 21.5 overflow 3 mtr internal then 4 mtr external no lagging and it has never frozen fall is 1 in 12 external
i also fitted same boiler in house opposite 2 weeks later 2mtr internal with 2" of external pipe work which froze twice in a week! (now insulated)
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