Mr. Heater F274830 MH18B Big Buddy Grey Indoor Portable Propane Heater

Can you imagine being at home one winter night and then the power goes and your electric heater goes off? That could prove to be one of the most horrific tales as you struggle to keep yourself warm with heavy clothing and heaps of duvets. Heaters are a very important part of our lives, and especially those of us that don’t live in the tropics. Winters and cold nights can turn extremely cold and the only solution, a heater. There are many types of heaters on the market make by different manufacturers. That is one of the reasons why it can get tricky choosing the right one for you. There are a number of things that you can look at when choosing the right heater for you and we are going to take a look at them below:

Mr. Heater F274830 MH18B Big Buddy Indoor Portable Propane Heater

Source of Power

Different heaters come with different sources of power. There are electric heaters which use electricity to work. They are effective until you realize how much the power you used cost. They are expensive to maintain due to the electricity costs. Another disadvantage of these types is in the event of a power blackout, you would run out of options if you don’t have a backup generator.

There are also heaters that are powered by petroleum gas. We all know the current gas prices, making these also very costly to maintain. The best option with these gas based heaters are the propane gas powered heaters. Those are heaters that use propane gas, a gas that is made of natural products such as decaying material. This gas comes cheap and the other advantage is that it produces very little toxic gas unlike petroleum gas. The propane generated heaters have gained popularity in the United States and are probably the most commonly used heaters. Many of them are also portable, making it easy to carry from one point to another.

Size of Area to be Heated

When choosing the right heater, it is important that you know the size of the room or space to be heated. This will make it easy for you to determine the size of the heater. Smaller rooms would generally use smaller heaters as compared to the bigger spaces.

Indoor or Outdoor Use

Basically, when it comes to this point, there are three types of heaters, indoor heaters, outdoor heaters and both indoor and outdoor heaters. Indoor heaters will generally be used within a closed premise while outdoor heaters can be used outdoors. It could be unsafe to use an indoor heater outside since the fire could easily spread out of proportion and cause damage or even explosions. Use a heater for its intended purpose only and as per the instructions with the heater to prevent any fatalities.

In this article, we are going to talk about the Mr. Heater F274830 MH18B Big Buddy Grey Indoor-Safe Portable Propane Heater (4,000, 9,000 and 18,000 BTU). The Most Popular Portable Propane Heater in North America. This patented radiant 4,000-18,000 BTU Liquid Propane heater connects directly to two 1 lb. cylinders and is the perfect solution for heating enclosed spaces like cabins up to 400 sq. ft. An integrated fan increases the heating capacity of this unit, blending radiant and convection style heat to give you the best of both worlds. Two swivel regulators give you the ability to adapt usage from disposable cylinders to a remote gas supply with the purchase of a single hose and filter. To light the unit, simply push and rotate the knob. The built in Piezo sparking mechanism will take care of the rest. With the Oxygen Depletion Sensor (ODS) and accidental tip-over safety shut-off, you can be sure that you will enjoy years of comfortable indoor safe heat. Please note that these heaters are not able to be sold in Canada and Massachusetts.

When using this heater with a 20lb propane bottle and hose, it’s important that one remembers to always turn the tank off first. Then let the heater run until it uses up all the fuel in the lines. If the heater is just turned off using the “off” setting, there is a possibility that there will be some gas that will be trapped in the hose. This will make the propane to cause a chemical reaction against the rubber, producing oil. As the oil gradually builds up, both the regulator and the control valve will eventually get clogged. A gas line filter comes highly recommended because it traps the oily residue as well as protecting the combustible parts of the heater. On high setting, the heater uses one pound of propane gas per hour, which is not too bad.


  • Heats up to 400 square feet
  • Hi-Med-Low heat settings
  • ​Indoor Safe Automatic low oxygen shut-off system (ODS)
  • ​Accidental tip-over safety shut-off
  • Connects to two 1 lb. cylinders or can connect to a 20lb tank with proper hose (F273703-60 or F273703-144)

Product Details

  • Show Download Tool: No
  • BTU per Hour: 4,000/9,000/18,000
  • ​Heating Area (Sq Ft): 450
  • Tank Capacity (Min): 2 x 1 Propane Cylinder
  • ​Run Time (Hrs at Max BTU): No
  • Fuel Consumption/Burn Rate (Gal/Hr): No
  • ​Electricity Required: No
  • ​Maximum Elevation (Ft): No
  • ​Weight (Lbs) : 17.10
  • ​Model: MH18B
  • Oversized: No
  • Length: 19.00
  • ​Width: 12.00
  • ​Height: No
  • ​Disclaimer: Not for sale in Massachusetts or Canada.
  • ​Use: Emergency Heat, Tents, Campers, Workshops, Job Sites, Porches, Patios, Decks, Garages, Storage Buildings, Picnics, Tailgate Parties, Construction Trailers, Sporting Events, Barns, Sheds, Hunting Blinds, Shelters, Ice Fishing Shanties
  • ​Warranty: 1 Year Limited
  • ​Thermostat: No
  • ​Safety Tip-Over Switch: Yes
  • ​Fuel Type: Propane
  • ​Heat Type: Radiant
  • ​Oxygen Depletion Sensor (ODS): Yes
  • ​High Limit Safety Shut-off (HLS): No
  • ​Indoor Safe: Yes
  • ​Ignition: Piezo
  • Hose & Regulator Included: Sold separately


  • Quickly and evenly heats up any small area
  • Built-in spark igniter
  • Low oxygen safety shut-off
  • Tip over safety shut-off
  • Lightweight and easy to carry


  • This propane heater does not come with a thermostat and there are some users that felt it necessary to have one. It would be a great convenience when it comes to conserving power since you can set the heater to turn on and off on an hourly basis.
  • There are some users that do not really understand how the fan works and claim th
    at it is too noisy.


This is an excellent heater to buy if you’re looking for an indoor propane heater. It comes with all the necessary safety features, and the fan evenly spreads the heat throughout the room.