Gas line size is the pipe diameter selected to deliver enough fuel to gas appliances based on total BTU demand, pipe length, and pressure drop. Proper sizing ensures safe, reliable operation for furnaces, boilers, water heaters, and ranges. Undersized lines can starve appliances and cause poor performance, while oversized lines add unnecessary cost.
/ɡæs laɪn saɪz/
Gas line size is the pipe diameter selected to deliver enough fuel to gas appliances based on total BTU demand, pipe length, and pressure drop. Proper sizing ensures safe, reliable operation for furnaces, boilers, water heaters, and ranges. Undersized lines can starve appliances and cause poor performance, while oversized lines add unnecessary cost.
Why is gas line size important?
It ensures appliances receive enough fuel for safe, efficient operation without pressure drop issues.
Source: The Cooling Company
BTU load, run length, and pressure determine gas line size.
When adding a new furnace or tankless water heater, a contractor calculates total BTUs and pipe run length to confirm the gas line can deliver enough fuel.
Have a licensed professional size and verify gas lines any time you add or replace gas appliances.
“Have a licensed professional size and verify gas lines any time you add or replace gas appliances.”
Even small changes in pipe diameter can significantly impact gas flow at distance.
Can an undersized gas line cause appliance problems?
Yes. It can lead to weak flames, poor heat output, or safety lockouts.
Does adding a new appliance require resizing?
Often, yes. The total BTU load may exceed the existing line capacity.
Who should size a gas line?
A licensed plumber or gas fitter should perform sizing and installation.
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