How to light your patio heater safely
The steps to light a patio heater depend on whether you have a propane model, natural gas line, or electric unit. Propane heaters—the most common type—use an ignition button or piezo starter that you press while opening the gas valve. Natural gas heaters work the same way but draw from a fixed line. Electric heaters have no flame; you straightforward plug them in and turn them on. All three types require you to check that the fuel source is connected and the area around the heater is clear of flammable objects before you attempt to light it.
The most important safety step happens before you light anything: make sure your heater is on level ground, at least 10 feet away from walls, fences, overhanging branches, and anything else that could catch fire. If you smell gas but the heater won't light after three or four attempts, stop trying and let the area air out for five minutes before you try again. A persistent gas smell with no ignition usually means a leak, and you should not use the heater until a professional inspects it.
Key Takeaways
- Propane heaters light by pressing the ignition button while slowly opening the control valve; the flame should appear within a few seconds.
- Always position your heater on level ground, at least 10 feet from walls, fences, and anything flammable before you attempt to light it.
- If the heater does not light after three attempts, stop and let any accumulated gas disperse for five minutes before trying again.
- Natural gas heaters use the same ignition method as propane but require a permanent gas line connection installed by a licensed technician.
- Electric heaters require no flame or fuel; plug them in and use the power switch or remote control to turn them on.
Lighting a propane patio heater
Most residential patio heaters run on propane and use one of two ignition systems: a piezo button (which creates a spark) or an electronic ignition (which uses a battery). Both work the same way from your perspective. First, make sure the propane tank is connected and the valve at the base of the tank is turned fully counterclockwise (open). You should hear a faint hiss of gas flowing.
Next, locate the control knob on the heater itself—usually at the base or on a side panel. Turn it to the "Pilot" or "Low" setting. Press and hold the ignition button (or switch, depending on your model) while you slowly turn the control knob counterclockwise to open the gas valve. Hold the button for 10 to 15 seconds. You should see a small flame appear at the burner. Once the flame is lit, release the button and adjust the knob to your desired heat level—usually marked "Low," "Medium," or "High."
If no flame appears after 15 seconds, release the button, wait 30 seconds, and try again. Do this no more than three times. If the heater still will not light, turn the control knob fully clockwise (closed) and wait five minutes for any gas to clear before you investigate further. Check that the propane tank is not empty by shaking it gently—a full tank feels heavy and sounds solid, while an empty one sounds hollow. If the tank is full, the ignition button itself may be faulty or the gas line may have a blockage.
Lighting a natural gas patio heater
Natural gas heaters operate identically to propane models but draw fuel from a fixed line running from your home or a gas meter. Because the gas supply is constant, you do not need to check a tank valve. The ignition process is the same: locate the control knob, turn it to "Pilot" or "Low," press the ignition button, and slowly open the gas valve by turning the knob counterclockwise. Hold the button for 10 to 15 seconds until the flame appears.
Natural gas heaters are more convenient than propane because you never run out of fuel mid-season, but installation requires a licensed gas technician to run the line and may support all connections are airtight. If you smell gas around a natural gas heater, do not attempt to light it. Turn off the gas supply at the meter or the shutoff valve nearest the heater, leave the area, and call your gas company or a licensed technician. A gas leak is a serious safety issue and must be addressed by a professional.
Using an electric patio heater
Electric patio heaters produce no flame and require no fuel source—only a power outlet and electricity. Plug the heater into a standard outdoor outlet (ideally one with a ground fault circuit interrupter, or GFCI, which cuts power if water reaches the outlet). Once plugged in, turn on the power switch or use the remote control if your model has one. Most electric heaters warm up within 30 seconds to a minute.
Electric heaters are the safest option because there is no flame or gas leak risk, but they consume more electricity than propane or natural gas and may not heat as large an area. They also require an outlet within cord length of where you want to place the heater, which limits placement flexibility. If you use an extension cord, make sure it is rated for outdoor use and is a heavy-duty model (12 or 10 gauge wire) to handle the heater's power draw safely.
Troubleshooting when your heater won't light
If your propane or natural gas heater clicks but produces no flame, the ignition system may be wet or the battery (if electronic ignition) may be dead. For a piezo heater, try pressing the button more firmly or more rapidly. For an electronic ignition, replace the battery—usually a AA or AAA—and try again. If the heater still does not light, the ignition electrode may be fouled by dust or debris; gently wipe it with a dry cloth and try again.
If you hear gas flowing (a hissing sound) but see no spark when you press the button, the ignition system itself is broken and the heater should not be used. Do not attempt to light it manually with a match or lighter—this is unsafe and can cause burns or an uncontrolled flame. Instead, turn off the gas and contact the heater's manufacturer or a propane service company for repair or replacement parts.
For electric heaters that do not turn on, check that the outlet is working by plugging in another device (like a lamp). If the outlet is dead, try a different outlet or have an electrician inspect the circuit. If the outlet works but the heater does not, the heater's internal switch or heating element may have failed and will need professional repair.
Seasonal maintenance before lighting
Before you light your patio heater for the first time each season, inspect it for damage or debris. Check that the propane tank (if you have one) is not dented, rusted, or leaking. Smell around the tank valve and the connection point where the hose attaches to the heater; if you detect any gas smell, do not use the heater. Tighten any loose hose connections by hand—do not use a wrench, which can damage the fitting.
Clear any spider webs, dust, or dead insects from the burner and ignition area using a soft brush or compressed air. These materials can block the ignition spark or clog the gas ports. If your heater has a glass or metal reflector, wipe it clean to improve heat reflection. For electric heaters, check the cord for cuts or damage and make sure the heating element is free of debris. A few minutes of inspection before the season starts prevents most lighting problems and keeps your heater running safely.
Frequently Asked Questions
Can I light a patio heater with a match if the ignition button doesn't work?
No. Attempting to light a patio heater manually with a match or lighter is unsafe and can cause severe burns or an uncontrolled flame. If the ignition system fails, turn off the gas and stop using the heater. Contact the manufacturer or a propane service company for repair or replacement parts.
Why does my propane heater smell like gas but won't light?
A gas smell without ignition usually means gas is accumulating in the burner area. Stop trying to light it when ready, turn the control knob fully closed, and wait five minutes for the gas to disperse. If the smell persists or returns when you try again, the heater may have a leak or a faulty ignition system. Do not use it until a professional inspects it.
How long does it take a patio heater to warm up?
Propane and natural gas heaters produce heat within seconds of ignition, though the area around them takes a few minutes to feel noticeably warmer. Electric heaters typically warm up within 30 seconds to one minute. The time it takes to heat your patio depends on the heater's power output and the size of the space.
Do I need to turn off the propane tank when I'm done using the heater?
Yes. Always turn the tank valve clockwise (closed) when you finish using the heater, especially at the end of the season. This prevents gas from leaking if the hose or connection is damaged and ensures the tank is safe during storage. Turn off the heater's control knob first, then close the tank valve.
Can I use a patio heater indoors or in an enclosed space?
No. Propane and natural gas heaters produce carbon monoxide and should only be used outdoors or in well-ventilated spaces. Using them indoors or in a garage, shed, or enclosed patio can be fatal. Electric heaters are safer indoors but still require proper ventilation and should never be left unattended while running.