Central Heating Pipe Sizes

2 Dec 2009
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United Kingdom
Can anyone help. Re-installing radiators after renovation and re-connecting 6 yr old viessman oil fired boiler which ran off of 42mm pipe then to 15mm pipe into radiators. Does anyone know if we can use 28mm pipe instead, then reducing to 22mm then to 15mm into radiators. Its a 5 bed house only heating upstairs of 130 sqm. Thanks for any help.
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