1 · System
Regulator to farthest appliance
First stage to second stage, PE
3 · Appliances (use nameplate BTU)
Add a typical appliance, then change the BTU to the nameplate:
Total load
{{totalText}} BTU/hr
Regulators
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First stage line · PE, 10 PSIG
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House piping · Schedule 40 steel, 11" WC
2 PSI trunk: size with your CSST maker's 2 PSI table. Branches below are for piping after each line regulator.
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Sized by the longest-length method: every pipe uses the table row at or above the longest run. Regulator picks are the smallest Marshall Excelsior model whose rated capacity covers the load. A guide only — final sizing must follow the code edition your AHJ enforces.