Mr. Heater Big Maxx Natural Gas Unit Heater w/ Propane Conversion Kit – 80000 BTU Review

First Impressions of the Mr. Heater Big Maxx Natural Gas Unit Heater w/ Propane Conversion Kit – 80000 BTU

The chill had truly set in. My workshop, a space that normally hums with activity regardless of the season, had become an arctic zone. Frost was creeping up the inside of the windows, and even thick gloves did little to stave off the bone-deep cold that seeped from the metal workbench and the concrete floor. I needed a serious solution, something far beyond the portable propane heaters that only offered localized warmth and a constant need for refilling. That’s when I turned my attention to the Mr. Heater Big Maxx Natural Gas Unit Heater w/ Propane Conversion Kit – 80000 BTU. This unit promised robust heating for larger spaces, with the flexibility of using either natural gas or propane, a key factor for my setup which currently relied on a propane tank. My previous portable heater, while functional for quick tasks, simply couldn’t keep up with extended work sessions in sub-freezing temperatures. Upon arrival, the Big Maxx presented a sturdy, utilitarian appearance. It’s not a decorative piece, but it speaks of industrial-grade reliability. The build quality felt solid, with a durable tan powder-coated finish that seemed ready to withstand the occasional bump or scuff common in a workshop environment. I briefly considered another brand’s direct-vent unit, but the inclusion of the propane conversion kit with this Mr. Heater model tipped the scales. My immediate reaction was one of hopeful anticipation; this felt like the heavy-duty solution I desperately needed.

Real-World Testing: Putting Mr. Heater Big Maxx Natural Gas Unit Heater w/ Propane Conversion Kit – 80000 BTU to the Test

First Use Experience

The initial setup for this Mr. Heater unit required careful planning, especially since I opted for the propane conversion. I decided to test it in my detached two-car garage, a space that measures roughly 500 square feet and is notoriously difficult to keep warm. Connecting the propane line and running the 115-V AC power for the ignition and fan were straightforward, guided by clear instructions.

During its first operation, the unit came to life with a distinct but not overly intrusive hum from the fan. The 80000 BTU thermal output was immediately apparent; within about 15 minutes, the ambient temperature in the garage rose from a frigid 30°F to a comfortable 60°F, and it continued to climb steadily. This heater was designed for these kinds of environments, and its performance was impressive.

The unit’s design allows for vertical or horizontal venting, and I chose a horizontal exhaust route through an existing wall penetration. This flexibility was crucial for my garage’s layout, as a vertical vent would have been far more complicated to install. I experienced no immediate issues or surprising quirks; the spark ignition fired reliably each time, and the unit maintained a consistent temperature once set.

Extended Use & Reliability

After several weeks of use, particularly during a cold snap where temperatures consistently hovered below 20°F, the Big Maxx has become an indispensable part of my workshop. I’ve run it for several hours each day, sometimes intermittently and other times continuously for an entire afternoon of woodworking. It has held up exceptionally well, with no discernible drop in performance or signs of strain.

The durability is evident. Despite a few accidental nudges from rolling tool carts, the exterior finish remains largely unscathed, showing only minor cosmetic scuffs. The fan continues to push a strong, consistent volume of warm air, and the ignition system has remained flawless, even with daily starts and stops.

Maintenance has been minimal, which is a huge plus. A quick once-over to ensure the vent is clear of debris is about all that’s required. Compared to previous heating solutions I’ve used in this space, from electric space heaters that struggled to make a dent to the constant hassle of refilling portable propane tanks, this unit is in a different league. It has significantly improved my ability to work comfortably and efficiently through the colder months.

Breaking Down the Features of Mr. Heater Big Maxx Natural Gas Unit Heater w/ Propane Conversion Kit – 80000 BTU

Specifications

The Mr. Heater Big Maxx Natural Gas Unit Heater w/ Propane Conversion Kit – 80000 BTU is a powerful heating solution, designed with a substantial 80000 BTU thermal output. This capacity is capable of heating up to a generous 2,600 sq. ft., making it ideal for larger spaces like garages, workshops, barns, or warehouses. The unit operates on either natural gas or propane, with a propane conversion kit included, offering significant fuel flexibility.

It requires a 115-V AC power source for its electronic ignition and fan system, which features a durable spark ignition and a self-diagnostic control module. This self-diagnostic feature is excellent for troubleshooting, alerting you to any potential issues with the unit’s operation. The gas connection is a standard 1/2″ gas connection, common for most gas appliance installations.

One of the standout features is its low profile design; its dimensions of 29.33 x 15.5 x 26.37 in and mounting clearance of only 1 in. mean it can be installed in spaces with lower ceilings without protruding excessively. The floor clearance recommendation is 8 ft., ensuring safe operation and proper heat distribution. The unit weighs in at 88.5 lb, indicating a robust construction. A thermostat is sold separately, which is a common practice for these types of heaters.

Performance & Functionality

In terms of performance, this Mr. Heater unit absolutely delivers on its promise of powerful heating. The 80000 BTU rating is not just a number; it translates into rapid temperature increases in large, uninsulated spaces. My garage, which often feels like a lost cause when the temperature drops, warms up noticeably within minutes of the unit cycling on.

The spark ignition features self-diagnostic control module proved to be a valuable component. During one instance, the unit briefly failed to ignite, and the diagnostic lights quickly indicated a gas supply issue, which was resolved by checking the propane tank valve. This feature alone saves considerable guesswork and potential service calls.

The primary job of this unit – heating a large space effectively – is performed exceptionally well. It provides consistent, widespread warmth rather than concentrated hot spots, creating a comfortable working environment. The ability to vent vertically or horizontally adds immense practical value, allowing for installation in a wide variety of building configurations.

Design & Ergonomics

The design of the Mr. Heater Big Maxx Natural Gas Unit Heater w/ Propane Conversion Kit – 80000 BTU prioritizes function over form, which is fitting for its intended application. The tan, powder-coated steel construction feels substantial and built to withstand the rigors of a workshop or garage environment. Its low profile design is a significant ergonomic advantage, especially in buildings with limited vertical clearance.

The controls are simple and straightforward: a power switch and a temperature control dial (assuming a thermostat is connected, as is standard for these units). The auto igniter simplifies startup, removing the need for manual pilot light procedures. While not inherently “ergonomic” in the handheld sense, the design facilitates easy mounting and connection, and the included 2 angle brackets for ceiling mount are a thoughtful addition.

The unit is designed for fixed installation, so while its weight of 88.5 lb is considerable, it’s not something you’ll be moving frequently. The 1/2″ gas connection is standard and easy to work with for plumbing. Overall, the design is robust, practical, and geared towards reliable, long-term operation in challenging environments.

Durability & Maintenance

Based on my experience so far, the durability of this unit appears to be excellent. The robust steel construction and the tan powder-coated finish suggest it’s built to resist corrosion and minor impacts. The fan motor feels solid, and the internal components, particularly the self-diagnostic control module, speak to a level of engineering designed for longevity.

Maintenance is refreshingly simple. For a unit of this power and application, I anticipated more complex upkeep, but it’s largely about ensuring the venting is clear and performing occasional visual inspections. For those using propane, checking the propane tank and connections is standard procedure.

The primary potential failure points for any gas heater revolve around ignition, gas flow, and the fan. The spark ignition is a common and reliable technology, and the self-diagnostic module should help in identifying issues proactively. Given the straightforward nature of its operation and the quality of its components, I anticipate this heater will provide many years of service with minimal hassle.

Accessories and Customization Options

The most significant accessory included with the Mr. Heater Big Maxx Natural Gas Unit Heater w/ Propane Conversion Kit – 80000 BTU is the propane conversion kit. This is a critical item that greatly enhances the unit’s versatility, allowing users to choose between natural gas and propane based on their existing infrastructure or fuel availability. Without this kit, the unit would be limited to natural gas lines, which may not be available in many garages or workshops.

The unit also comes with 2 angle brackets for ceiling mount. These are essential for proper installation and provide a secure way to suspend the heater, which is particularly useful for maximizing floor space. While not strictly “accessories” in the traditional sense, the thermostat (sold separately) is a crucial component for managing the unit’s operation efficiently. Many users opt for a programmable thermostat to automate heating cycles and save on fuel.

Beyond the included mounting brackets and the conversion kit, there isn’t extensive “customization” in the way one might think of with smaller electronics or tools. The core functionality is fixed at 80000 BTU. However, the choice of venting direction (vertical or horizontal) offers a significant degree of installation customization, allowing it to fit various building layouts.

Pros and Cons of Mr. Heater Big Maxx Natural Gas Unit Heater w/ Propane Conversion Kit – 80000 BTU

Who Should Buy Mr. Heater Big Maxx Natural Gas Unit Heater w/ Propane Conversion Kit – 80000 BTU?

This Mr. Heater Big Maxx Natural Gas Unit Heater w/ Propane Conversion Kit – 80000 BTU is an excellent choice for homeowners and small business owners who need to effectively heat large, uninsulated or poorly insulated spaces. It’s particularly well-suited for:

• Garage and Workshop Owners: Those who spend significant time working in their garage or workshop during colder months will find this heater transforms the space into a comfortable working environment.
• Barn and Agricultural Users: Individuals needing to keep livestock areas, workshops, or storage barns at a stable temperature will benefit from its robust heating capabilities.
• DIY Enthusiasts and Mechanics: Anyone undertaking projects that require extended time in a cold garage or shed will appreciate the consistent warmth.
• Small Business Owners: Retail spaces, storage units, or small warehouses that require supplemental heating can utilize this unit’s powerful output.

Those who should probably skip this product include individuals who only need to heat a very small, confined space or require a portable heating solution. If you are looking for a heater that doesn’t require any electrical hookup or permanent installation, this unit would not be the best fit. For those needing precise climate control in a sensitive environment like a server room, a dedicated HVAC system would be more appropriate.

Must-have accessories would include a compatible thermostat, ideally a programmable one, to optimize fuel usage and maintain consistent temperatures. Depending on the installation, appropriate venting materials (chimney pipe, caps, elbows) that meet local building codes are also essential. Proper gas line installation by a qualified professional is highly recommended to ensure safety and compliance.

Conclusion on Mr. Heater Big Maxx Natural Gas Unit Heater w/ Propane Conversion Kit – 80000 BTU

The Mr. Heater Big Maxx Natural Gas Unit Heater w/ Propane Conversion Kit – 80000 BTU stands out as a highly capable and versatile heating solution for anyone grappling with cold, large spaces. Its 80000 BTU output consistently delivers substantial warmth, making frigid garages, workshops, and barns comfortably usable year-round. The inclusion of the propane conversion kit is a significant advantage, offering flexibility that many comparable units lack.

While the unit’s sturdy build quality and intelligent self-diagnostic control module suggest excellent longevity, it’s important to note that the thermostat is sold separately, which adds to the initial investment. The low profile design is a smart engineering choice, making installation feasible even in spaces with lower ceilings.

Considering its powerful performance, durable construction, and the invaluable fuel flexibility it offers, the price point feels justified for the value delivered. If you’re looking to reclaim your cold-weather workspace or simply want reliable, robust heating for a substantial area, this Mr. Heater unit is a highly recommended investment. It’s a tool that doesn’t just heat a space; it transforms it.