A Big Maxx garage heater is a permanently installed gas-fired unit heater designed to heat garages, workshops and other outbuildings. Mounted overhead to save valuable floor space, it delivers reliable, even heat throughout the workspace, making it possible to continue working comfortably through colder months.

Available in a range of heating capacities and fuel configurations, Big Maxx heaters can be matched to different building sizes and heating requirements. They're built for long-term installation and are supported by genuine replacement parts to help keep them working for years to come.

he best Big Maxx heater depends primarily on the size of the space you're heating. As a general guide:

Model - Recommended Area*

• MHU50 - Up to 1,667 sq. ft.
• MHU80 - Up to 2,667 sq. ft.
• MHU125 - Up to 4,167 sq. ft.

* Recommendations are based on typical building conditions. Ceiling height, insulation, doors, windows and climate can all affect heating requirements. If your garage has high ceilings or poor insulation, a larger model may be more appropriate.

If you're unsure which heater is right for your space, we're always happy to help.

Big Maxx garage heaters are designed for permanent installation and require gas, venting and electrical connections. 

While experienced homeowners may be comfortable with some aspects of the installation, gas connections should be installed and tested in accordance with local codes and regulations. 

Installation and repairs involving the gas or electrical systems should be carried out by a qualified installer or service technician in accordance with the owner's manual and local codes.

We recommend reviewing the installation manual before purchasing to understand the requirements for your building.

Regular maintenance helps keep your Big Maxx heater operating safely and efficiently for years to come. Before each heating season, inspect the venting system, and clean dust and debris from the cabinet and air openings. 

It's also a good idea to have the heater inspected periodically to ensure the burner, heat exchanger and gas components are operating correctly.

Big Maxx heaters are built for long-term use and are supported by genuine replacement parts. If a component eventually wears out, many parts can be replaced to help restore dependable performance rather than replacing the entire heater.

Yes. Big Maxx garage heaters are designed to be maintained over many years of service. Genuine replacement parts are available for many components, allowing worn or damaged parts to be replaced rather than the entire heater.

While some maintenance tasks can be carried out by the owner, repairs involving the gas system, electrical components or heat exchanger should be performed by a qualified HVAC technician. If you need help identifying the correct replacement part for your heater, our team is always happy to assist.

Yes. Genuine replacement parts are available for many Big Maxx garage heaters, helping extend the working life of your heater when a component wears out. From pressure switches and ignitors to control boards, motors and other service parts, many common replacement components can be ordered through LionCove.

If you're unsure which part you need, our team is always happy to help identify the correct replacement for your specific Big Maxx model.

View Big Maxx parts diagram here.

Mr. Heater specializes in heating equipment for homes, workshops, jobsites and outdoor spaces. Alongside its well-known portable heaters, the company manufactures permanently installed Big Maxx garage heaters that help turn garages and workshops into comfortable, year-round workspaces

Big Maxx reflects many of the qualities we look for in long-term ownership: dependable performance and genuine replacement parts. Plus the heaters are backed by a 3-year warranty on parts and burners, and a 10-year warranty on the heat exchanger. 

No, we're not. LionCove is an independent Canadian retailer that carries products from lots of different manufacturers including heater products from Mr. Heater, HeatStar and DEWALT. We stock genuine replacement parts for many of the products we sell and can help customers identify the correct replacement parts, but we are not the manufacturer or a division of Mr. Heater.