If a domestic boiler/gas appliance is in a commercial property, does this mean a gas engineer would need commercial tickets/qualifications?
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Welcome to the forum. Although you can post in any forum, the USA forum is here in case of local regs or laws
If the installation is commercial, then yes.
Up to U16, up to 0.035M cubed up to 35mm pipework, is domestic. The volume includes the primary meter.
Others will interpret the rules differently so I suggest you read them yourself and decide.
IGE/UP/1B.
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