Yes, natural gas heaters can often be converted to LPG (liquefied petroleum gas) by replacing or adjusting certain components, but it’s essential to consult a professional to ensure safe and compliant modifications.
Many homeowners wonder if their natural gas heaters can be converted to use liquefied petroleum gas (LPG). The short answer is yes – but with important caveats. Conversion requires proper parts, expertise, and in some cases may not be recommended by manufacturers.
Understanding the Conversion Process
Converting a natural gas heater to propane involves several key modifications because these fuels burn differently. Natural gas operates at lower pressure (0.5-2 psi) compared to propane (10-11 psi). The conversion typically requires:
- Replacing or adjusting gas orifices/jets
- Modifying or replacing the gas valve
- Adjusting the air-to-fuel mixture
- Potentially changing the pilot assembly
Conversion Kits
Many manufacturers offer conversion kits for their heaters. For example, Mr. Heater sells conversion kits for some of their models. These kits typically include:
| Component | Purpose |
|---|---|
| New orifices | Regulate proper gas flow for propane |
| Conversion instructions | Step-by-step guidance |
| Required hardware | Any special fittings or adapters |
When Conversion Isn’t Recommended
Some heaters should never be converted between fuel types:
Ventless Heaters
Ventless gas heaters have precise combustion requirements. Many manufacturers explicitly warn against converting these units due to safety concerns. The incomplete combustion could lead to dangerous carbon monoxide levels.
Older Units
Older heaters may not have available conversion kits. Without manufacturer-approved parts, attempting conversion could be unsafe.
Professional Installation Recommended
While some handy homeowners might consider DIY conversion, most experts recommend professional installation because:
- Gas work requires specialized knowledge
- Improper conversion can create fire hazards
- Professionals can test for leaks and proper combustion
- Many jurisdictions require licensed technicians for gas work
As noted in garage journal forums, “Every year I see something about a house blowing up and it’s usually because somebody was screwing around with a propane furnace.”
Alternative Options
If conversion isn’t practical, consider:
Running a Natural Gas Line
For some applications, extending your natural gas service may be more cost-effective than conversion. A 60-foot gas line installation might be comparable in price to a professional conversion.
Purchasing a Propane Heater
New propane heaters like vented propane models are designed specifically for LPG and often include modern safety features.
Cost Considerations
Conversion costs vary significantly:
- Simple orifice changes: $25-50 for parts
- Complete valve replacement: $100-200+
- Professional installation: $150-500
Compare this to the cost of a new propane heater ($300-$2000) when making your decision.
Safety First
Before attempting any conversion:
- Verify your heater model can be safely converted
- Obtain the proper conversion kit
- Consider professional assistance
- Test for leaks after conversion
- Check local codes and regulations
Remember that while many natural gas heaters can be converted to propane, not all should be. Always prioritize safety and proper installation when working with gas appliances.
