Mr. Heater Big Maxx 45,000 BTU Natural Gas Garage Unit Heater #MHU45NG Review

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(More customer reviews)We used an unvented natural gas heater in our garage for several years. With many more cold days this past winter, we began having concerns with the excess amount of moisture and condensation produced by non-venting. Having already roughed-in the electrical and thermostat wiring for a unit heater when the garage was built, we decided it was time to switch to a vented heater.
We looked at the Modine and Big Maxx heaters and selected the Big Maxx 45 when it went on sale for $399 at Northern Tool. We ordered the heater and had it shipped to a store in our area to avoid shipping charges. The heater arrived much quicker that we anticipated. Our original plan was to install the heater sometime during the summer and be ready for next winter. The next weekend was nice weather so we decided to go ahead and install the Big Maxx.
Since the heater needed to mount at a 45 degree angle to the room, we mounted unistrut channel to the ceiling joists and mounted the heater thereto. We used category I gas vent from Lowe's. Installation was simple and straight forward. Then we turned the heater on.
The induced draft motor made a LOT of noise and vibration. Then the blower fan came on and you needed hearing protection to stay in the room. In the bedroom above the garage, it actually sounded like someone was running a couple of hammer drills. Being an engineer, I inspected both blowers to see why they vibrated so badly. The induced draft blower had a nice looking squirrel cage blower but the shaft hole was drilled off center. The next day we took the heater down, boxed it up and returned it to Northern as defective.
Next we ordered a Modine heater. Installation was a little more complicated because we already had the hole in the wall for the vent. We mounted this heater slightly differently to take advantage of the existing hole. This heater required Category III venting for our installation so we ordered Z-Vent online. The Modine heater is quiet as a mouse. As they say, "you get what you pay for".

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The MHU45NG is a propane fired, forced air convection heater. This unit is ideal when ceiling heights do not allow for infrared heaters to be used. It easily installs from the ceiling with included angle brackets. Unit has power exhaust which allows for both vertical or horizontal venting.Unit is thermostatically controlled and includesa spark ignition system with self diagnostic control module. This CSA certified heater will heat up to 700 square feet and comes with a three year limited warranty on the parts and the burner and a ten year warranty on the heat exchanger.

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Mr. Heater 80,000 BTU Propane Convection Heater #MH80CV Review

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(More customer reviews)I use the Mr. Heater 30-80K convection heater in my garage, which is roughly 625 SF with high 14 ft. ceilings, CMU block wall, un-insulated ceiling. During winter months of the teens outside, I can bring the inside temp of my garage up to 70 degrees within a short time. However, you may need to hang a box fan up near the ceiling or install a ceiling fan to circulate the heat back down, it puts out a strong trickle of heat in a 360 degree radius that is easy to regulate to keep from alternating between freezing and roasting.
The biggest plus for me with this unit it the lack of objectionable fumes as are produced by forced air kerosene heaters, the propane burns clean and is easy to purchase at my local filling station, no spills or lugging around 5 gallon containers of kerosene.
If massive amounts of heat are what you want, you should consider the forced air propane heater made by Mr. Heater. They put out massive quantities of heat in short order.
I get about 15 hours of use per 25 pound propane tank, the same type my BBQ runs on, by turning this unit on high and then shutting it down to low, alternating this cycle. You can use upwards of a 100 pound propane tank.
The unit is much smaller then I expected which is a plus, it is light and very well made and simple to use.

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The Mr. Heater MH80CV 30,000-80,000 Btu portable propane convection heater is ideal for heating large indoor spaces of up to 1,900 square feet. The convection design draws cold air up from the floor through propane burners then distributes warm air out through the top, giving you 360-degree directional heat. The unit features a piezo push-button igniter, adjustable heat output control (from 30,000-80,000 Btu), and an "Insta-Lock" system for easy, tool-free assembly. For safety, the heater shuts off with loss of flame, and the sturdy base keeps it upright. The included 10-foot hose connects to 20-pound (minimum required) propane cylinder. CSA Certified. One-year limited warranty.--Josh Dettweiler
What's in the BoxHeater, thermocouple, manual, operating instructions, regulator, 10-foot hose

Five Tips for Buying a HeaterChoosing a space heater is a matter of sifting through a bewildering array of types, power ratings, and fuel sources. Let's break it down a little to make the process easier.

What are the different types of space heaters?
Radiant heaters emit infrared radiation that directly warms the objects in front of the heaters (rather than the surrounding air). If you only need heat by a desk or in a small section of a room, a radiant heater is quiet and will use very little power.
Forced-air heaters use a fan to blow air that has been warmed by metal or ceramic heating elements. A forced-air heater is appropriate for quickly heating up a small- to medium-sized room, but can be noisy.
Convection heaters draw cold air from the floor; the air is warmed by heating coils and emitted from the top of the heater. A convection heater is appropriate for quickly heating up a small- to medium-sized room, but also can be noisy.
Radiators work by heating oil enclosed in a reservoir, gradually heating the surrounding air. If heating speed isn't an issue, you might want to opt for a radiator. These are extremely quiet and effective--perfect for bedrooms.


Should I buy an electric or a combustion model?If you want a heater that will be available in emergencies, or that can heat areas larger than a single room, choose a "combustion" model--one that is powered by a gas or fuel like propane, kerosene, natural gas, or diesel. Which fuel type you choose depends largely on convenience and local availability. For example, diesel would be appropriate for a heater you take with you on long car trips.

How powerful a heater do I need?Heaters are rated by BTU, which stands for British Thermal Unit (the amount of heat needed to heat one pound of water by 1 degree F). To find out how many BTU you need:
Calculate the volume of the space to be heated by multiplying square footage by height.
Multiply that number by 4 if your insulation is poor, 3 if it's average, or 2 if it's good.
The resulting number is a ballpark figure for how many BTU you'll need.
Do space heaters cost a lot to operate? As a general rule, electric space heaters are more expensive to use than combustion models. To ensure energy efficiency, a thermostat is a must-have feature for any heater. For radiant heaters, models with a 360 degree heating surface can heat larger spaces. If you need a forced-air heater, models with ceramic elements tend to be more efficient.

Are space heaters a fire hazard?Space heaters are implicated in about 25,000 residential fires every year. To ensure proper safety, always follow the manufacturer's usage instructions and fill out the warranty card to receive informational updates from the manufacturer. Also, look for extra safety features such as an automatic shutoff switch that can shut down the unit if, for example, it gets upended. In addition, choose a model where the heating element is adequately enclosed within the unit.

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