Propane and Gas Fireplace Service in Independence

The differences that matter

Propane carries far more energy per cubic foot than natural gas and it is delivered to the appliance at a higher pressure. The consequence is that the burner orifices have to be physically smaller. Run a propane supply into an appliance still fitted with natural gas orifices and it receives far more fuel than it can burn with the air available. What you see is enormous lazy yellow flame, rapid sooting of the logs and the glass, and elevated carbon monoxide. It is one of the few faults in this trade that is both dangerous and completely obvious to look at.

The reverse error is quieter and just as wrong: an appliance with propane orifices fed natural gas produces a small, weak, lifting flame that will not stay lit reliably.

Conversion kits exist for most units and are straightforward when done by someone who then verifies the result. Verification means checking manifold pressure with a manometer against the label, not lighting it and deciding it looks about right. If your appliance was moved between fuels at some point in its history and nobody can tell you who did it, that is worth checking.

Tanks in deep cold

Propane has to boil off inside the tank to reach the appliance as vapor, and its ability to do that depends on temperature. In severe cold the vapor pressure falls, and a tank that is nearly empty has very little liquid surface left to vaporize from. Combine those on a hard cold night with several appliances drawing at once and the pressure at the burner can sag enough for things to misbehave. The symptom is appliances dropping out during the coldest weather rather than during ordinary weather. Keeping the tank comfortably above a quarter through winter is the simple preventative, and it is worth knowing this is a supply issue rather than assuming the fireplace has failed.

Altitude on top of all that

Thinner air up here means less oxygen for combustion, and many manufacturers publish high-altitude adjustments for that reason. It stacks with the fuel question rather than replacing it, so an appliance that is correct on both counts is worth confirming once and then not worrying about.

One consequence of being this far up is worth planning around. A sealed direct-vent appliance terminates through a sidewall, usually only a foot or two above grade, and in Independence that clearance disappears under snow and drift by midwinter. A buried termination will trip a sealed unit out on its pressure switch at best, and on a house that sits empty between visits there is nobody there to notice until the coldest week of the year. The vent deserves the same seasonal look as the tank does.

The annual visit

Burner and pilot cleaned, orifice and manifold pressure verified against the rating label, logs positioned to the manufacturer's diagram, thermopile output measured, glass and gasket checked, venting and termination cleared, and a carbon monoxide reading taken with the appliance running.