A standard 20-pound propane tank lasts about 8 to 10 hours on a patio heater, depending on the heat setting and outdoor conditions.
Propane patio heaters extend outdoor comfort, but fuel efficiency depends on BTU output, tank size, and usage patterns. A standard 20-lb propane tank typically provides 8-15 hours of heat, but smart management can optimize runtime.
Propane Tank Duration by BTU Output
Patio heaters consume propane at different rates based on heat settings:
| BTU Rating | 20-lb Tank Runtime | Heat Coverage |
|---|---|---|
| 30,000 BTU | 12-15 hours | 15′ diameter |
| 40,000 BTU | 8-10 hours | 20′ diameter |
| 50,000 BTU | 6-8 hours | 25′ diameter |
High-end models like the Totum HLS patio heater feature adjustable BTU outputs, allowing precise fuel management.
Factors Affecting Propane Consumption
1. Environmental Conditions
Wind reduces efficiency by 15-30%. For windy areas, consider a built-in gas heater with wind screens.
2. Temperature Settings
Each 10°F increase in thermostat setting consumes 20% more fuel. Optimal comfort typically occurs at medium settings (30,000-35,000 BTU).
3. Tank Size Variations
- 5-lb tanks: 2-3 hours at 40,000 BTU
- 20-lb tanks: 8-10 hours at 40,000 BTU
- 100-lb tanks: 40-50 hours at 40,000 BTU
Maximizing Propane Efficiency
Strategic Placement
Position heaters near reflective surfaces (stone walls, glass doors) to increase effective heat output by 15-20%.
Maintenance Tips
- Clean burner tubes monthly with compressed air
- Inspect thermocouples annually (replacement guide)
- Store tanks upright to prevent liquid propane leaks
Safety Considerations
The National Fire Protection Association recommends:
- Maintain 10-foot clearance from structures
- Never use outdoor heaters in enclosed spaces
- Check for leaks using soapy water solution
Alternative Heating Options
For permanent installations, consider electric infrared models with zero emissions. The U.S. Energy Information Administration reports propane costs approximately $2.50 per gallon, making electric options competitive in some regions.
Properly maintained stainless steel patio heaters typically last 5-10 years, while powder-coated models average 3-6 years. Always verify manufacturer specifications for your specific model’s fuel consumption rates.
