Yes, you can convert a natural gas heater to propane by replacing the gas orifices, adjusting the pressure settings, and ensuring proper ventilation; however, it’s crucial to consult a professional to ensure safety and compliance with local codes.
Converting a natural gas heater to propane is possible but requires careful adjustments. The process involves changing orifices, regulators, and sometimes valves to accommodate propane’s higher pressure and energy density. While some DIYers attempt this, professional installation is strongly recommended for safety.
Key Differences Between Natural Gas and Propane
Natural gas and propane have distinct characteristics that affect heater performance:
| Characteristic | Natural Gas | Propane |
|---|---|---|
| Pressure | 0.25-0.5 psi | 10-11 psi |
| Energy Content | 1,000 BTU/ft³ | 2,500 BTU/ft³ |
| Storage | Utility lines | Tanks |
Why Conversion Requires Modifications
Propane contains more than twice the energy per cubic foot compared to natural gas. This means:
- Smaller orifices are needed to control flow rate
- Different pressure regulators must be installed
- Combustion air mixtures may need adjustment
Conversion Process Step-by-Step
1. Check Manufacturer Specifications
First verify if your heater model supports conversion. Many manufacturers provide conversion kits for ventless heaters with detailed instructions.
2. Obtain the Correct Conversion Kit
Kits typically include:
- Propane-specific orifices
- New gas valve springs
- Updated regulator
- Conversion instructions
3. Safety Precautions
Before starting:
- Turn off gas supply
- Disconnect power
- Have fire extinguisher ready
- Work in ventilated area
Professional vs DIY Conversion
When to Call a Professional
Consider hiring a licensed technician if:
- Your heater lacks a conversion kit
- You’re unfamiliar with gas systems
- The unit requires complex adjustments
- You need to verify proper combustion
According to Patriot Propane, improper conversions can lead to dangerous gas leaks or carbon monoxide production.
DIY Conversion Tips
If attempting yourself:
- Take before photos of all connections
- Label all removed parts
- Use thread sealant approved for gas
- Test for leaks with soapy water
Cost Considerations
Conversion costs vary based on:
- Heater type (wall unit vs furnace)
- Kit availability
- Labor rates in your area
Average costs range from $150-$500. Compare this to purchasing a new propane heater which may be more cost-effective for older units.
Safety Checks After Conversion
Essential Post-Conversion Tests
After completing the conversion:
- Check all connections for leaks
- Verify proper flame color (blue with yellow tips)
- Test carbon monoxide levels
- Confirm adequate ventilation
As noted on Practical Machinist forums, improper conversions can create dangerous situations.
Alternative Options
If conversion seems complex, consider:
- Installing a dedicated propane heater
- Running natural gas lines to your location
- Using electric heating alternatives
For temporary heating needs, battery-operated space heaters may provide a safer solution.
