What gas pressure does a fireplace need for natural gas versus propane?
Natural-gas fireplaces typically run on low-pressure supply around 3.5 inches of water column at the burner, while propane units run higher, around 10 to 11 inches. The appliance's manifold pressure is set precisely at install for its fuel — and a natural-gas unit can't run on propane, or vice versa, without the correct conversion kit and orifices.
Two fuels, two pressures — and different orifices
Natural gas and propane aren't interchangeable at the flip of a valve. Natural gas is delivered at low pressure and metered to roughly 3.5 inches of water column at the burner manifold; propane operates higher, around 10 to 11 inches, and carries far more energy per cubic foot. Because of that, propane needs smaller orifices — the tiny metered openings that feed the burner. Run a natural-gas fireplace on propane without converting it and you get sooting, over-firing, and an unsafe flame.
Getting it right at install
Most fireplaces we carry ship configured for one fuel and can be field-converted to the other with the manufacturer's kit — Napoleon, Heat & Glo, Kozy Heat and the rest supply matched orifices and conversion parts. On propane we set the regulator, confirm manifold pressure with a manometer, and dial the flame in. This matters more at our elevation: propane burns hotter per unit, and a setup that's wrong for the fuel or the altitude soots the glass and logs fast.
Why this is licensed, tested work
Setting and verifying gas pressure isn't a DIY adjustment — it's measured, not guessed, and getting it wrong is a safety and carbon-monoxide issue. In North Carolina this is licensed gas work: we confirm supply pressure, set manifold pressure to the manufacturer's spec, pressure-test the line, and pull the permit so the inspector signs off. Fairview, Candler, and Brevard cabins on propane get the LP setup; Asheville and Hendersonville homes on the mains get natural gas. Call (828) 545-0525.
Related questions
- Will my fireplace put out less heat on propane than on natural gas?
- Are gas log BTU ratings different for propane versus natural gas?
- Can my gas meter or propane regulator handle adding a fireplace?
- How much gas does a fireplace use per hour at full input?
- What size propane tank do I need to run a gas fireplace or log set at home?
- How many BTUs per square foot do I need to heat a room with a fireplace?
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