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  • Mr. Heater 40,000 BTU Natural Gas Garage Heater #MH40NG
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Mr. Heater 40,000 BTU Natural Gas Garage Heater #MH40NG

15 customer reviews
| 17 answered questions

List Price: $565.34
Price: $394.73 & FREE Shipping. Details
You Save: $170.61 (30%)
In Stock.
Ships from and sold by Amazon.com. Gift-wrap available.
  • Enter your model number above to make sure this fits.
  • Efficient, cost effective infrared heat
  • For use in buildings with 12 to 15 ft ceilings
  • No electricity required
  • Heats up to 750 sq. ft.
  • Maintenance free; no moving parts
  • Quiet, clean, odor free operation
  • Check the user manual attached below for further information.
5 new from $347.93 2 used from $302.19

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$394.73 & FREE Shipping. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

Mr. Heater 40,000 BTU Natural Gas Garage Heater #MH40NG + Mr. Heater F271239 One-Stop Universal Gas-Appliance Hook-Up Kit
Price for both: $418.71

Buy the selected items together

Product Description

The MH40NG is highly efficient and cost effective radiant garage heater. Its quiet, clean, odor free operation directly heats people and objects which in turn heat surrounding air to the desired temperature. Heater is thermostatically controlled and requires no electricity to operate. There are no moving parts so maintenance is kept to an absolute minimum. This CSA certified heater will heat up to 750 square feet and comes with a limited one year warranty on the controls and a pro-rated five year warranty on the burner assembly.


Product Details

User Guide [PDF]
  • Product Dimensions: 35.5 x 12.5 x 21 inches ; 28.2 pounds
  • Shipping Weight: 28.2 pounds (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item can be shipped to select countries outside of the U.S. Learn More
  • Origin: China
  • ASIN: B0000AXF0M
  • Item model number: F272800
  • Average Customer Review: 4.2 out of 5 stars  See all reviews (15 customer reviews)
  • Amazon Best Sellers Rank: #509,860 in Home & Kitchen (See Top 100 in Home & Kitchen)
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

17 of 20 people found the following review helpful By Chuck R. on June 10, 2010
Verified Purchase
Received timely and it's a great heater. Also, a part was missing and the instructions said to contact the manufacturer. They provided the missing part immediately. Installation relatively easy and instructions good.
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8 of 8 people found the following review helpful By Derek Acheson on April 4, 2014
Verified Purchase
This keeps my 3 bay garage warm and toasty , Very easy to Install , no power needed for stat
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6 of 6 people found the following review helpful By Randy Beer on December 3, 2012
The heater didn't work when first installed.pilot light wouldn't stay lit. Talked with tech person & he sent me a new thermocouples & gas valve. Found out it was a defective valve. Now the heater works great. Tech erson was great to work with.
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4 of 4 people found the following review helpful By Brian on January 11, 2014
Verified Purchase
I thought I could get away with no venting on this based on descriptions but discussed this with a plumber and the consensus is, since I live in MinneSNOWta with all the snow melt off in the garage, with no venting there would be a ton of moisture from the snow melt with no where to go so if you buy it, don't forget to budget in the cost to vent!
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3 of 3 people found the following review helpful By Owlish52 on February 4, 2014
Verified Purchase
After installing both units, I found that 1 was quite sufficient to keep my 24' x 30' x 11' storage building warm (about 50 F). Some observations include that an 11' tall roof is almost too low for these heaters, as the recommended clearances are fairly substantial. While these heaters do not require (or provide for) a direct vent, proper ventilation is important - check the Mr Heater web site for ventilation guidelines (400 cfm fresh air per 100,000 BTU, or 160 cubic feet per minute for one of these heaters). Unless your building is very 'leaky', consideration for additional ventilation is needed and likely necessary. This does not add that much to the heater run time.

These heaters and their associated thermostat (one came with a thermostat, the other did not - new units should have one) are powered by an built-in thermopile, a group of thermocouples that generate a 650 mV signal as long as the pilot is on. This means that no external electric power is required for the heater or the thermostat, but also means that you can not use just any thermostat with these heaters. Thermostats that use a 650 mV control are available, but many are set up to control larger furnaces and use 12/24V or even 120 V AC, so be careful if you need a new or replacement thermostat. One of my local home improvement stores carried a 650 mV thermostat (both had several as catalog items), but they both had a number of 12/24v DC and 120v AC thermostats in stock. The included thermostat has performed well so far (a couple of months), turning the heater on at the preset temperature and warming the building about 10 F before shutting off.

In my application, the heater runs about 30 minutes per hour in really cold circumstances (15-20 F outside, cold for here in Texas anyway).
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4 of 5 people found the following review helpful By Marty on May 2, 2013
Verified Purchase
This heater needs a shield for the pilot light. It has the right flame length per instructions but the slightest breeze blows it out. Needs to be relight each time it cycles off. Working with mfg for a fix.
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1 of 1 people found the following review helpful By Cavitt Donelson on February 9, 2015
Verified Purchase
Awesome heater. I'm heating a three car garage in Minnesota with it and have to turn it down. My third bay is an add on and the roof is insulated but it still heats all three bays. I started receiving my bills and it hasn't dramatically impacted my gas bill year over year. I expected it to be much worse. You do need the to pay attention to the specified clearances. Without my un-insulated bay I would not have had the clearance for this heater.
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1 of 1 people found the following review helpful By sb on December 11, 2012
After unpacking I found a dent and crease in the upper housing and a corner of the reflector bent up. It requires a separate thermostat to operate (not included) . Figured the cheaper sale price was because this looks more like a scratch and dent sales item. Still isn't up and running yet as I haven't made the second trip to the hardware store.
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Mr. Heater 40,000 BTU Natural Gas Garage Heater #MH40NG
This item: Mr. Heater 40,000 BTU Natural Gas Garage Heater #MH40NG
Price: $394.73
Ships from and sold by Amazon.com
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