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  • Masterbuilt GS40 Black Propane Smoker, 40-Inch
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Masterbuilt GS40 Black Propane Smoker, 40-Inch

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List Price: $249.95
Price: $165.75 & FREE Shipping. Details
You Save: $84.20 (34%)
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Ships from and sold by Amazon.com.
40 Inch
  • Four chrome smoking racks and a stainless steel burner
  • Extra-large capacity of 1,307 square inches of cooking space
  • Gas control valve and spark igniter with Type 1 regulator and hose
  • Porcelain-coated wood chip tray and water pan
  • Push button ignition and a built-in temperature gauge
6 new from $165.75
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Frequently Bought Together

Masterbuilt GS40 Black Propane Smoker, 40-Inch + Masterbuilt 30-Inch Electric Smoker Cover + Weber 17004 Apple Wood Chips, 3-Pound
Price for all three: $193.80

Buy the selected items together

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Customer Rating 4.3 out of 5 stars   (364) 4.2 out of 5 stars   (1,728) 3.7 out of 5 stars   (28) 4.0 out of 5 stars   (94)
Price $165.75$177.00$179.99$177.36
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Power Source Propane Electric Propane Charcoal
Material Steel Steel Cast Iron Steel
Color Black Black white Black
Length 26.6 inches 20 inches 27 inches 20.2 inches
Height 36.6 inches 33.5 inches 46.46 inches 47.03 inches
Width 18.8 inches 17 inches 19.2 inches 34.52 inches
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Product Details

Size: 40 Inch
User Guide [PDF]
  • Product Dimensions: 26.6 x 18.8 x 36.6 inches ; 91.6 pounds
  • Shipping Weight: 93 pounds (View shipping rates and policies)
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • Shipping Advisory: This item must be shipped separately from other items in your order. Additional shipping charges will not apply.
  • Item model number: GS40
  • Average Customer Review: 4.3 out of 5 stars  See all reviews (364 customer reviews)
  • Amazon Best Sellers Rank: #3,123 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden)

Product Description

Masterbuilt GS40 Black Propane Smoker, 40-Inch

The rich, full flavor of slow-cooked food has been a staple of outdoor cookouts. The Masterbuilt 40-inch Extra Large Vertical Gas Smoker delivers smokehouse flavor as easy as grilling! This gas smoker come fully equipped with two doors, making adding woods chips or water easy and with minimal heat loss allowing you to have as much or as little smoky flavor you would like for your foods. This extra large smoker has over 1,300 square inches of total cooking space on four chrome cooking racks. This smoker also has 15,400 BTU’s with a stainless steel burner. With its convenient, built-in temperature gauge right in the door, you will always know the temperature of your food while it still cooks. The locking door design helps to keep the heat and smoky flavor inside. The push-button ignition makes start up easy. Whether you’re cooking pork, chicken, beef or seafood, the delightfully smoky aroma that permeates from the Masterbuilt 40-inch Extra Large Vertical Gas Smoker has a way of making friends and family flock around the smoker in the spirit of good times and good food!

Customer Questions & Answers

Customer Reviews

It worked great, very easy to use.
Amazon Customer
Everything I smoked with it has turned out great and recommend the product for a biginner smoker.
Timothy Beaulieu
The temp control is very good and will maintain settings below 200 degrees.

Most Helpful Customer Reviews

382 of 395 people found the following review helpful By p3orion on September 17, 2012
Size Name: 30 Inch
I recently decided to buy a propane smoker, and comparison-shopped the various models that were readily available and less than $200. I looked at Lowe's, Home Depot, WalMart, Sears, and Char Broil (the company is here in Columbus, Georgia.) After seeing each in person, and reading a lot of online reviews, I bought the MasterBuilt Pro smoker at Home Depot for $179.

I opted against "bullet" style smokers because only one rack is accessible without a lot of trouble. The Weber Smokey Mountains are supposed to be great, but they start at about $300. The Brinkmann Smoke 'N Grill I had for a while was such a piece of crap that I finally gave up trying to "fix" it, and sold it for $15 at a yard sale (and still was cheating the guy at that price.) Horizontal cookers hold a lot of meat, but it's notoriously difficult to control an even temperature in one unless you fabricate a reversing plate; they also take up a lot of space when not being used.

So I started investigating vertical cabinet-style smokers. The Char-Broil CB600X was tempting because I could buy one from the distributor here, already assembled, for only $100 (a savings of about $70.) However, it just seemed so cheaply made that I didn't want to deal with its many reported problems: leaking, bad thermometers, peeling paint, and a combination chip and water dish that everyone seems to hate. Also, every Char-Broil grill I've ever owned has rusted out in only two seasons.

I rejected WalMart's Great Outdoors smoker because it has only one door; tending the chips or water means you'll probably spend 30 minutes or more before the cooking area gets back up to temperature.
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166 of 171 people found the following review helpful By MGB on May 1, 2012
Size Name: 30 Inch
I bought this last week after having continues frustrations with my barrel smoker. This seemed to be able to help with e biggest problem I was encountering with e barrel smoker, regulating and maintaining a low heat. I like to go low and slow!! This is a great smoker, takes about 30 minutes to build with very easy to follow directions. Connect the propane bottle and place some chips in the dish. I turned onto a medium heat to get it going and then down to a low heat to maintain. I managed to keep it around 180 degrees. I poured apple juice in the liquid tray. I smoked a chicken and a rack of ribs. Both turned out better than I have EVER smoked before. A few things you have to keep your eyes on. You have to maintain your wood chips for smoking every 30 minutes or so, and keep your liquid tray full as I let it boil dry and now have encrusted crystallized apple juice on the bottom. It is a seriously good smoker I reccomend it. Ohhh before I forget, I've seen some comments on smokers saying that they got a metallic taste on their food, YOU HAVE TO read the instructions and CURE your machine with olive oil. It burns off e new paint smell and you get no aftertaste, it's easy to do and only takes an hour.
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181 of 194 people found the following review helpful By GalvezGuy on September 5, 2011
Size Name: 40 Inch Verified Purchase
Make sure you burn this unit in before cooking the first time, there were a lot of noxious chemicals that burned off.
I broke this unit in with two racks of pork ribs, two racks of beef ribs, two chickens, a whole brisket, one rabbit, and five pounds of sausage.


Great temperature control with the propane. Was able to keep it the desired temperature and forget about it
Capacity is great, could easily smoke four whole turkeys in there
Adjustable grates were very useful in makeing room for everything
Comes back up to temp very quickly after the door was opened
Temperature gauge is dead on accurate and verified by an oven thermometer


Drip/water pan is a joke, especially for a unit of this size, I overcame by using a large foil pan.
Smoke pan looks like a fire trap, especailly using the drip pan that came with it I used an old cast iron skillet which did the job very well
Seems to use a lot of propane, about 1/2 tank for 10 hours of smoking
Some smoke leaks out the door which means that some heat is escaping that way as well, could accout for the larger than expected propane use. I will be sealing it with some fireplace rope.


Temp control is great, with the addidtion of a cast iron skillet, the ability to control the smoke is awesome
Capacity is more than enough for all but the largest of home events
The food came out great, everything was most and tender because low and slow is the way to go.
I would recommend it with the easy modifications I have mentioned(seal door, use cast iron pan for wood chunks, use large pan for drip/water pan)

Rating is four stars for too small drip pan and faulty design of the smoke tray.
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76 of 80 people found the following review helpful By mackvet on November 1, 2011
Size Name: 40 Inch
When something is so great as this smoker, where to you begin. I made the decision to get a propane smoke as it is a lot easier to maintain a consistent temperature than the traditional charcoal or wood smoker. Also, you don't have to stay glued to this smoker like the traditional smokers to stoke the coal or wood. The smoker went together with ease. Wanting to do a Thanksgiving turkey, I did a trial run and prepared a 17.5 pound turkey. I preheated the smoker to 250, I set the turkey in the middle of the smoker cabinet and loaded the pan with hickory as well as the water pan. After reloading the pan with hickory blocks three times and the water pan twice the turkey was ready in 7 hours. First of all, I am not crazy about turkey but this turkey was moist and had a fantastic taste. The next order of business before Thanksgiving is ribs and brisket.

After reading a bunch of reviews, there was a consistent report regarding the temperature gauge on the cabinet door and the pan you put the wood blocks in. The remedy for these two negative were easy to handle.

1. Purchase a 8" iron skillet to place over the pan that is furnished with the smoker. Putting your wood blocks in the skillet will insure that the wood does not catch on fire which it will if you use the pan furnished with the smoker.

2. The temperature gauge on the cabinet door is off anywhere from 20 to 25 degrees. It is not dependable. I used a digital thermometer and stuck the probe in the thigh of the turkey and ran the wire out the cabinet door. I also placed another thermometer of the same type to monitor the cabinet temperature. I took a metal clip and stood the probe in the air attached to one of the grill bars.
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