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Gas Pipe question 22mm to 15mm

Harvest Fields said:
If the gas pipe should have been 22mm then it should have been done on the last boiler install. If the last Engineer didn’t do it. What makes you think the next will?
Click to expand...

I don't, which is why I qualified it with the phrase "if necessary". It could become necessary because (a) different model of boiler with differing MIs from the current one, or (b) change in regs, etc.
 

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