How to Convert a Propane Space Heater to Natural Gas: A Comprehensive Guide

Converting a propane space heater to natural gas can be a complex process, but it can be done with the right knowledge and tools. This comprehensive guide will walk you through the step-by-step process of converting your propane space heater to natural gas, including the technical specifications and DIY tips to ensure a successful conversion.

Understanding the Conversion Process

When converting a propane space heater to natural gas, the primary modifications you’ll need to make are to the orifice, pressure regulator, and possibly the valve. Propane has a higher energy content per unit volume than natural gas, so the orifice size needs to be increased to accommodate the lower energy content of natural gas. Additionally, the pressure regulator must be changed to ensure the correct gas pressure for natural gas operation.

Technical Specifications for Conversion

how to convert a propane space heater to natural gas

Orifice Size

The orifice size needs to be increased to accommodate the lower energy content of natural gas. The exact size will depend on the specific heater and gas pressure. As a general guideline, the orifice size for natural gas is typically 30-50% larger than the orifice size for propane. For example, a propane heater with a 0.018-inch orifice may require a 0.025-inch orifice for natural gas conversion.

Pressure Regulator

The pressure regulator needs to be changed to ensure that the gas pressure is correctly regulated for natural gas. Propane typically operates at a higher pressure (around 11 inches of water column) compared to natural gas (around 7 inches of water column). Using the wrong pressure regulator can lead to improper combustion and potential safety hazards.

Valve

In some cases, the valve may need to be replaced with one that is compatible with natural gas. This is particularly important if the existing valve is not designed to handle the lower pressure and flow rate of natural gas.

DIY Conversion Steps

Check the Manufacturer’s Instructions: Before attempting any modifications, check the manufacturer’s instructions to see if the heater can be converted from propane to natural gas. Some heaters may not be designed for conversion, and attempting to do so could be unsafe.
Gather the Necessary Parts: If the heater can be converted, purchase a conversion kit (if available) or gather the necessary parts, including the appropriate orifice, pressure regulator, and valve (if needed).
Turn Off the Gas Supply and Disconnect the Propane Tank: Ensure the gas supply is turned off and disconnect the propane tank from the heater.
Remove the Burner Assembly: Carefully remove the burner assembly to access the orifice.
Replace the Orifice: Replace the existing orifice with one that is suitable for natural gas operation. Refer to the technical specifications or the conversion kit instructions for the correct orifice size.
Install the New Pressure Regulator: Install the new pressure regulator designed for natural gas operation.
Replace the Valve (if necessary): If required, replace the existing valve with one that is compatible with natural gas.
Reassemble the Burner Assembly: Carefully reassemble the burner assembly and ensure all connections are secure.
Test the Heater: Turn on the gas supply and test the heater to ensure it is operating correctly with natural gas. Observe the flame pattern and adjust the air-fuel mixture if necessary.

Remember, converting a propane space heater to natural gas is a complex process that should only be undertaken by a qualified professional. Attempting to convert a heater without the proper knowledge and equipment can be dangerous and may result in damage to the heater or personal injury.