If you smell gas nowLeave the building without using switches, flames, or phones indoors. From outside, call 911 if there is immediate danger and call your gas utility. Contact a private-side contractor only after the area is declared safe.
The short answer
Input rating, pipe length, material, pressure, fittings, and connected load all matter. Symptoms such as poor performance are not enough to diagnose pipe size because venting, controls, combustion air, and equipment condition can produce similar problems.
What matters in this situation
An appliance hookup is only as safe and reliable as the piping that feeds it. The existing branch, shutoff, connector, venting responsibilities, and combined gas demand all need to be understood before connection.
Details that help define the next step
- Old and new heater input ratings
- Pipe size and approximate route
- Other appliances on the branch
- Meter and regulator configuration
These details help establish scope; they do not replace an emergency response, onsite inspection, utility decision, permit requirement, or manufacturer instruction.
How a careful service process is organized
- Start by documenting old and new heater input ratings and pipe size and approximate route.
- Confirm other appliances on the branch and meter and regulator configuration before the scope is finalized.
- Have model/specification sheet and photos of piping and shutoff ready for the onsite team or authority.
- Use the findings to define the appropriate gas appliance hookup scope, required testing, and any next authority or trade.
What to have ready when requesting service
- Model/specification sheet
- Photos of piping and shutoff
- Home appliance list
- Installer requirements
What not to do
Do not increase regulator pressure or modify orifices to compensate for an undersized line. Keep relevant tags, notices, equipment information, and safely obtained photos available for the people handling this specific situation.