How to Convert Mr. Heater from Propane to Natural Gas: A Comprehensive Guide

Converting your Mr. Heater from propane to natural gas can be a straightforward process, but it’s crucial to follow the manufacturer’s instructions and safety guidelines to ensure a successful and safe conversion. This comprehensive guide will walk you through the step-by-step process, providing you with the necessary technical details and specific instructions to help you convert your Mr. Heater with confidence.

Understanding the Conversion Process

The primary difference between propane and natural gas is the gas pressure and the orifice size required for proper combustion. When converting a Mr. Heater from propane to natural gas, you’ll need to replace the orifice and adjust the regulator to accommodate the different gas pressure.

The conversion process typically involves the following steps:

Obtaining the correct conversion kit for your specific Mr. Heater model.
Replacing the orifice with the one designed for natural gas.
Adjusting the regulator to the appropriate natural gas pressure.
Ensuring proper combustion and safety checks.

Selecting the Correct Conversion Kit

how to convert mr heater from propane to natural gas

The first step in the conversion process is to identify the correct conversion kit for your Mr. Heater model. Mr. Heater offers a variety of conversion kits designed for specific heater models, ensuring a seamless and safe conversion.

For example, if you have a Mr. Heater Big Maxx Indirect Fired Unit Heater 50K or 80K BTU, you can use the Big Maxx Fuel Conversion Kit – LP to NG (SKU F260164). This kit is designed specifically for Heatstar by Enerco or Mr. Heater Big Maxx Indirect Fired Unit Heaters.

If you have an MH25LP or H22L Mr. Heater space heater, you can use the Fuel Conversion Kit LP to NG (SKU F200294) to convert it from liquid propane to natural gas.

It’s important to note that the conversion should only be performed by a licensed professional, as improper installation can lead to safety hazards.

Replacing the Orifice

The orifice is a small opening that controls the amount of gas entering the burner. When converting from propane to natural gas, the orifice needs to be replaced with one designed for natural gas.

The conversion kit will typically include the necessary natural gas orifice. Follow the manufacturer’s instructions carefully when replacing the orifice to ensure a proper fit and secure installation.

Adjusting the Regulator

The regulator is responsible for controlling the gas pressure entering the heater. When converting from propane to natural gas, the regulator needs to be adjusted to the appropriate natural gas pressure.

The conversion kit will provide the necessary information on the correct natural gas pressure for your specific Mr. Heater model. Carefully follow the instructions to adjust the regulator to the recommended setting.

Ensuring Proper Combustion and Safety Checks

After replacing the orifice and adjusting the regulator, it’s crucial to perform a thorough safety check to ensure proper combustion and safe operation of the converted Mr. Heater.

This may include:

Checking for gas leaks using a leak detection solution.
Verifying the flame pattern and color, ensuring a clean and stable flame.
Measuring the gas input rate to ensure it matches the manufacturer’s specifications.
Checking the thermocouple and safety controls to ensure they are functioning correctly.

It’s important to follow the manufacturer’s instructions and consult with a licensed professional if you have any doubts or concerns during the conversion process.

Conclusion

Converting your Mr. Heater from propane to natural gas can be a straightforward process, but it’s essential to follow the manufacturer’s instructions and safety guidelines to ensure a successful and safe conversion. By selecting the correct conversion kit, replacing the orifice, adjusting the regulator, and performing the necessary safety checks, you can confidently convert your Mr. Heater to run on natural gas.

Remember, the conversion should only be performed by a licensed professional to avoid any safety hazards. With the right tools, knowledge, and attention to detail, you can successfully convert your Mr. Heater and enjoy the benefits of natural gas heating.