Natural Gas Pipe Sizing in 90 Seconds
If your furnace runs but the house never quite gets warm, the problem usually is not the furnace. It is the gas line feeding it.
What the video covers
An undersized gas line starves every appliance downstream. Here is how to size one right, using just three numbers. Number one.
The load. Add up the B-T-Us of every appliance on that line. Furnace, water heater, range.
Key points
That is your demand. Number two. The length.
Measure from the meter to the farthest appliance. Use that one length for the whole system. Number three.
Why it matters
The pressure. Standard homes run about seven inches of water column, with a small allowable drop. Take those three numbers to the code sizing table.
Find your length, read across to your B-T-U, and it gives you the pipe size. Get it right and every appliance gets exactly what it needs. Get it wrong, and you will chase problems for years.
Frequently asked questions
What's the main takeaway of "Natural Gas Pipe Sizing in 90 Seconds"?
If your furnace runs but the house never quite gets warm, the problem usually is not the furnace. It is the gas line feeding it.
Why does it matter?
An undersized gas line starves every appliance downstream.
How do you approach it?
Here is how to size one right, using just three numbers.
Where do the exact numbers come from?
Run your inputs through the free tool at https://plumbcalc.pro/ — it does the real calculation with the safe defaults. This page is method-level and never a substitute for the live engine.
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Related topics: gas line · gas pipe sizing · natural gas · pipe sizing · plumbing · plumbing tips