TL;DR
Manifold pressure is the gas pressure measured at an appliance's burner manifold, downstream of its regulator, that determines how much fuel the burners receive. Natural gas appliances typically run at 3.5 inches of water column and propane at 10 to 11, set with a manometer against the rating plate value.
What it means
Manifold pressure is the gas pressure measured at an appliance's burner manifold, downstream of its regulator, that determines how much fuel the burners receive. Natural gas appliances typically run at 3.5 inches of water column and propane at 10 to 11, set with a manometer against the rating plate value. Technicians check it during furnace and water heater commissioning, since a wrong setting causes sooting, short cycling, or dangerous overfiring.
Where it sits in the glossary
Manifold pressure is part of the Trade jargon group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
License: CC-BY-4.0 — quote freely with attribution to ProFix Editorial Team / ProFix Directory.