Unless it is a waste pipe
But I am significantly worried that the gas supply is unlikely to be adequate if it includes old steel pipe under a concrete floor. It should have a minimum pressure loss on full power ( including gas cooker on ) of less than 1.0 mbar.
Tony
He removed the fire and did some other work to the gas. How many appliances do you have now?
If it's just the boiler there will be no allowance for any drop on the gas - even without a smell.
Existing pipework with new appliance = no drop.
Wide open, and where is the other valve?Is this valve open or closed?
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