Yes, you can convert an LPG heater to natural gas, but it requires a conversion kit and professional installation to ensure safety and compliance with regulations.
Converting an LPG (propane) heater to natural gas is possible in many cases, but requires careful consideration of safety, compatibility, and local regulations. While some heaters can be converted with a simple kit, others may need professional modifications or cannot be converted at all.
Key Differences Between LPG and Natural Gas
LPG (propane) and natural gas have distinct properties that affect heater performance:
| Property | Propane (LPG) | Natural Gas |
|---|---|---|
| Energy Content | 2,516 BTU/ft³ | 1,030 BTU/ft³ |
| Pressure | 10-11 inches WC | 3.5-7 inches WC |
| Storage | Pressurized tanks | Piped utility supply |
Why Conversion Requires Modifications
The higher energy content of propane means natural gas requires larger orifices to deliver equivalent heat output. According to Mr. Heater, most conversions involve:
- Replacing gas orifices/jets
- Adjusting regulator pressure
- Modifying air shutter settings
- Potential valve replacements
Types of Heaters That Can Be Converted
Convertible Models
Some manufacturers design heaters for dual-fuel use. For example, the Big Maxx garage heater offers conversion kits with proper documentation.
Non-Convertible Models
Ventless heaters often cannot be converted due to precise combustion requirements. As noted in ventless propane heater discussions, these units have strict safety mechanisms that prevent modification.
Conversion Process Overview
1. Verify Compatibility
Check manufacturer specifications – some units clearly state “not convertible” in manuals.
2. Obtain Proper Kit
Genuine conversion kits include:
- Correct orifice sizes
- Pressure regulator
- Installation instructions
3. Professional Installation
Most jurisdictions require licensed technicians for gas appliance modifications. Improper conversions can create dangerous situations.
Safety Considerations
Critical Warnings
- Never attempt conversion without proper kit
- Ventless heaters require special caution
- All conversions need leak testing
The National Fire Protection Association reports improper conversions contribute to hundreds of gas-related incidents annually.
When Conversion Isn’t Practical
Cost Analysis
Sometimes purchasing a natural gas-specific heater proves more economical than conversion, especially for older units.
Technical Limitations
Some burner designs cannot properly adjust for the different combustion characteristics between fuels.
Professional Assistance
Always consult with qualified HVAC technicians before attempting any fuel conversion. They can:
- Assess your specific heater model
- Obtain correct conversion parts
- Perform pressure tests
- Ensure compliance with local codes
Proper conversion maintains safety while allowing you to take advantage of natural gas availability. However, when in doubt, replacement with a properly configured unit is often the wisest choice.
