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The Daily Insight

What happens if you run a natural gas furnace on propane

Author

Samuel Coleman

Published Apr 18, 2026

You are running the risk of ruining your furnace when you run a natural gas furnace on propane without using a conversion kit. In addition, if you do not modify your furnace or install a blower, it can cause an explosion because of the incorrect ratio of air and pressure.

Can a natural gas furnace run on propane?

Can you convert a natural gas furnace to run on propane? Yes. Converting from natural gas to propane as a fuel source is a matter of a conversion kit that compensates for the differing pressure needed to properly operate the unit.

Is a natural gas furnace the same as a propane furnace?

BTU comparison One cubic foot of propane = 2,516 BTUs compared to one cubic foot of natural gas = 1,030 BTUs. Propane contains more than twice the energy of natural gas. In one hour, a 100,000 BTU natural gas furnace burns around 97 cubic feet while a propane furnace burns only 40 cubic feet in an hour.

What happens when you hook propane to a natural gas heater?

Connecting propane to a natural gas stove is a bad idea. It would burn too hot and could damage the stove. It’s also dangerous, especially if you’re using an indoor stove, as any propane leaks would create the risk of a dangerous explosion.

How do I run a natural gas heater with propane?

  1. Convert Furnace. Turn off the gas supply and disconnect the electrical power to the furnace. Remove the screws holding the burner access door and then remove the door. …
  2. Attach Gas Connections. Install the outdoor propane gas supply to the gas supply line. …
  3. Adjust Input Rate. Turn off the electricity to the furnace.

How much hotter does propane burn than natural gas?

While both propane and natural gas burn at the same temperature—3,560˚ Fahrenheit—what you get when they burn is actually quite different. You get more energy with a unit of propane than you do with natural gas. One cubic foot of natural gas generates about 1,012 BTUs (British Thermal Units) of heat.

Can natural gas appliances run on propane?

Most, but not all, appliances can be converted from natural gas to propane. The biggest sticking point is that natural gas is kept at a lower pressure, and some appliances can’t handle the higher pressure of propane even with adjustments.

What are the disadvantages of using propane?

  • It can cause health problems. Propane comes with a downside especially the risk of propane poisoning, a condition similar to frostbite. …
  • Logistical problems. Most propane requires delivery to homes so that it is then piped to the home. …
  • Safety concerns. The other issue with propane is safety.

How much does it cost to convert a furnace from propane to natural gas?

This substantial cost difference may lead homeowners to consider converting from propane to natural gas once natural gas becomes available in their neighborhood. The conversion process can be complicated, and the cost can range from under $1,000 to more than $5,000.

Is propane considered a natural gas?

The differences between natural gas and propane can be confusing. Especially because propane is one of the fuels that make up natural gas, the other fuels being butane, methane, ethane. While propane is a part of natural gas, it becomes a unique source of fuel on its own when it’s separated during processing.

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How is natural gas different from propane?

Natural gas vs propane: conclusion Both are odourless, colourless, and clean-burning fossil fuels. Propane is more energy-efficient and considered to be a green fuel, while natural gas is not. … Propane is delivered in propane tanks. Lastly, propane is heavier than air, but natural gas is lighter.

What should the gas pressure be on a propane furnace?

Propane fired systems should have an input pressure of 11.3 inches of water column (not psi) to a maximum of 14 inches.

Which is better to cook with propane or natural gas?

Bottom line: there is NO performance difference between propane and natural gas unless you’re grilling in the arctic. The only major difference is the convenience of natural gas and never running out of fuel. Your choice ultimately boils down to which fuel sources you have access to and the costs in your area.

Does propane burn faster than natural gas?

Propane is more expensive than natural gas but natural gas burns much faster than propane. In fact, it burns at a rate of two to one. This means that to heat two spaces of the same size, you’ll use twice as much natural gas than propane.

Does propane burn at a lower temperature than natural gas?

Propane also burns hotter than natural gas (2500 BTU’s vs 1000 BTUs), which some grilling purists believe is one of the most important factors to keep in mind. Propane is considered to be environmentally-friendly because there’s no lead, has low GHG emissions and produces water vapor and carbon dioxide.

Can you convert LPG to natural gas?

You can convert propane to natural gas with most gas appliances, and vice versa. … Typically, some kind of conversion kit is required, even if just to change the size of the gas jets.

Which is safer natural gas or propane?

As a fuel, propane is also safer – Propane has a much narrower range of flammability (minimum and maximum burn temperatures) than natural gas; propane will not ignite when combined with air unless the ignition source reaches at least 920 degrees F.

Are propane furnaces safe?

Pro: It’s Safe and It Burns Clean One of the biggest benefits of propane is that it’s non-toxic. That means the tanks can be buried underground. It also burns clean. That means propane furnaces typically don’t need as much maintenance.

Which is cheaper propane or natural gas?

Propane is usually more expensive than natural gas, but the same amount produces about twice as much heat. … In some areas, natural gas is more economical, and in others, propane costs less. Both types of fuel are more efficient and less expensive than electricity in many regions.

Is propane gas toxic?

Propane vapor is not toxic, but it is an asphyxiating gas. That means propane will displace the oxygen in your lungs, making it difficult or impossible to breathe if exposed to high concentrations. If you suspect you have inhaled a significant amount of propane, call 911.

Is liquid propane the same as propane?

The terms propane and liquid propane are used interchangeably in the grilling industry. In fact, propane, liquid propane, propane gas, and LP all refer to the same thing when we’re talking about grills.

What happens if gas pressure is too high?

Improper gas pressure, on the side of the gas train can cause the unit to over heat if it is too high. … Likewise, too much on the inlet side of the valve will cause gas valve failures or no heat because the valve cannot open against “high pressures”.

How much pressure does a 500 gallon propane tank have?

So, I know that a 500 gallon tank of LPG at -20 °F will have about 11.5 PSI due to a reduced boiling point.

Why is propane standing pressure higher than natural gas?

Natural gas is a much lower pressure gas than propane and converting the appliance to one or the other gases requires that the differing pressure is compensated for. … The reason for this is because natural gas orifices are larger than propane orifices strictly because of gas service pressure.

Is a propane range worth it?

It burns clean and emissions are low. There’s also the positive impact on your pocketbook. Since propane heats quickly, you use less to get your cooktop or oven up to the desired temperature. It’s estimated that homeowners can save 30% – 50% annually when compared to electric appliances, in a report by Energy.gov.

How long does a 500 gallon propane tank last for a house?

House Size (Square Footage):How Long Will A 500-Gallon Propane Tank Last?500 sq ft14 Months and 4 Days

Is it expensive to heat with propane?

Propane heat is more economical and more efficient than electric heat. Virtually anything in your house, restaurant or building that can run on electricity can run on propane. However, the cost of a propane fueled home is actually less than the cost of a home with electric heat.