I am fitting extra radiators and using a mixture of 10mm micro bore and 15mm copper pipe. When fitting 10mm to 15mm copper pipe in a central heating system, is it true that you can only reduce in size and not the other way, as it will cause trapped air.
Will 10mm to 15mm cause trapped air?
- Thread starter troy
- Start date
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So it's OK to to fit 10mm copper into 15mm copper then connect to the TRV.
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