How to Know Which Gas Regulator to Use (Practical Guide)

Selecting the right gas regulator comes down to fuel type (NG vs LP), outlet pressure, and capacity (BTU/CFH). Use the quick steps and table below, then shop regulators and accessories that fit your install.

Step 1 — Set Your Target Outlet Pressure

• Natural Gas (NG): many appliances target about 3.5" w.c. at the inlet (check your rating plate).
• Propane (LP): many appliances target about 10–11" w.c.
• 2-PSI systems: Use a line regulator to step 2 psi down to appliance pressure (e.g., 11" w.c.).

Step 2 — Size Capacity (BTU/CFH)

• Add the BTU/hr input of the appliance(s) served by the regulator.
• Convert if needed: 1 CFH ≈ 1,000 BTU/hr.
• Pick a regulator whose capacity ≥ load at your outlet pressure.

Regulator Types (Where They’re Used)

• Appliance regulator: final stage control at the appliance inlet.
• Line/intermediate regulator: steps intermediate pressure (e.g., 2 psi) down to appliance pressure.
• Service regulator: utility side (street to building)—usually not homeowner-supplied.

Indoor vs. Outdoor & Venting

• Outdoors: vent screen faces down and is kept clear.
• Indoors: pipe the vent outside or use a listed vent-limiting device per the model instructions.
• Never plug or cap a regulator vent.

Install Checklist

• Confirm fuel (NG/LP), inlet pressure range, and outlet setpoint.
• Mount in the correct flow direction; keep vents unobstructed.
• Use gas-rated sealant on NPT; no sealant on flare seats.
• Leak-test all joints; verify outlet pressure under load.

“Shop This Type” Cards

Helpful: For detailed regulator capacities, use manufacturer charts or an online sizing tool from the regulator brand to match BTU/CFH at your outlet pressure.