Mr Heater Buddy vs Big Buddy: Which Should You Choose? (November 2026)
Choose the Portable Buddy for lighter, lower-output heat and the Big Buddy for more output, wider coverage and a built-in fan. Both offer radiant propane heat, but your space and fuel setup should guide the choice.
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Choose the Portable Buddy for lighter, lower-output heat and the Big Buddy for more output, wider coverage and a built-in fan. The Mr Heater Buddy vs Big Buddy choice depends on how much space you need to heat, how often you'll carry the heater and which fuel setup fits your plans.
The Portable Buddy offers 4,000 or 9,000 BTU and coverage of about 225 square feet. The Big Buddy adds an 18,000 BTU setting, coverage up to 450 square feet and a built-in fan.
We compared the stated features and dimensions for these two heater sizes. Check the exact model's instructions and approval for your location before using any propane heater indoors.
Mr Heater Buddy vs Big Buddy: which has more heat?
The Big Buddy has the higher maximum output: 18,000 BTU versus 9,000 BTU for the Portable Buddy. It also has a lower setting of 4,000 BTU, while the Big Buddy adds a 9,000 BTU setting between its minimum and maximum.
BTU measures heat output. Our guide to what BTU means in a heater explains how to use that number when comparing models.
The Big Buddy is rated to heat spaces up to 450 square feet. The Portable Buddy models are rated for about or up to 225 square feet, depending on the version.
Those coverage figures are not a promise that either heater will warm every room of that size evenly. Room layout, insulation, drafts and placement affect how heat feels in the space.
When is 9,000 BTU enough?
A 9,000 BTU maximum may suit a smaller area or a person who wants a compact radiant heater for a defined spot. The Portable Buddy is rated for about 225 square feet, and its radiant heat is directed from the heater rather than circulated by a built-in fan.
A low setting of 4,000 BTU gives you another option when full output is more than you need. The Big Buddy also has these 4,000 and 9,000 BTU settings, so choosing it does not mean you must always run it at 18,000 BTU.
Compare the heater's coverage guidance with the room you intend to use. If your space is larger or you want the fan to help circulate warmth, the Big Buddy has the clearer feature match.
When does the Big Buddy's extra output help?
The Big Buddy's 18,000 BTU maximum and 450-square-foot coverage make it the stronger fit for a larger area. Its built-in high-powered fan helps circulate warm air through the space.
A fan can be useful when you want warmth to move beyond the area directly in front of the radiant heater. The stated features do not quantify how evenly the fan distributes heat, so room shape and placement still matter.
For a garage, compare the heater to the room and your intended use. Our guide to choosing a heater for a garage covers the questions to ask before picking a model.
Which one is easier to carry?
The Portable Buddy weighs 7.1 pounds, half the Big Buddy's 14.1 pounds. Choose it when lifting and moving the heater is a frequent part of your routine.
Both sizes have portability features. The Portable Buddy Midnight has an easy-carry handle and reinforced wire guard, while the Big Buddy has an easy-grip handle and reinforced wire guard.
The Big Buddy's added weight comes with more heat output, coverage and a fan. That can be a fair trade if the heater will mostly stay in one place, but it is a bigger load to move between a vehicle, storage and a heating spot.
If you want a closer look at the smaller model's features and trade-offs, read our Mr. Heater Portable Buddy heater review.
For a broader set of compact options, see our guide to the best portable propane heater.
What fuel setup fits each heater?
Both heater sizes can use a 1 lb propane cylinder, while the Big Buddy can hold two cylinders at once. The Big Buddy also connects to a 20 lb tank with an optional Buddy hose and fuel filter.
Portable Buddy models also describe a 20 lb tank connection using Buddy accessories or an optional hose and filter. Check the instructions for your exact model and use only authorized accessories, since unauthorized attachments may cause serious injury and void the warranty.
The Big Buddy's dual tank capacity gives you a choice between two 1 lb cylinders and a larger tank connection. With a 20 lb tank, the Midnight Series Big Buddy states up to 96 hours of runtime on low, with the hose sold separately.
The Portable Buddy Midnight states up to 5.4 hours from a 1 lb cylinder and up to 108 hours when connected to a 20 lb cylinder with an optional hose and fuel filter. These runtime figures are model-specific claims, so compare them only for the stated fuel and heat setting.
The Mr. Heater fuel filter is compatible with Big Buddy and Portable Buddy heaters and connects to appliance regulators and hoses.
It does not connect directly to a propane tank.
What safety and indoor-use details should you check?
Check the approval for your exact heater and location before indoor use. The Portable Buddy Midnight and Big Buddy Midnight are described as approved for indoor and outdoor use, but indoor use is not approved in Canada or Massachusetts.
The standard Portable Buddy information here states outdoor approval. Don't assume every heater with the Buddy name has the same indoor-use approval.
The Big Buddy and Portable Buddy Midnight include a Life Safety System with low oxygen shutoff, tip-over shutdown and self-extinguishing protection. These features don't replace careful setup, ventilation and following the manufacturer's instructions.
Use the heater only in spaces and conditions allowed by its manual. Keep it away from materials that can burn, and don't use unauthorized hoses or attachments.
Which Mr. Heater Buddy should you choose?
Pick the Portable Buddy if you value lower weight and need heat for a smaller area; pick the Big Buddy if you need higher output, more coverage and a built-in fan. The [Mr.
Heater Big Buddy reviews](/mr-heater-big-buddy-reviews/) offer a closer look at the larger model.
For a fast choice, match the heater to your space and routine:
- Choose the Portable Buddy for a 7.1 lb heater with up to 9,000 BTU and about 225-square-foot coverage.
- Choose the Big Buddy for up to 18,000 BTU, coverage up to 450 square feet and a built-in fan.
- Choose the Portable Buddy Midnight if you want the smaller format and its stated indoor and outdoor approval, subject to location limits.
- Consider the fuel filter when setting up a compatible hose connection to a larger tank.
The best Mr. Heater propane heater guide compares more models by use.
If your priority is the smaller Buddy itself, see the Portable Buddy heater review before deciding.
Our score weighs specs, features and buyer feedback against what you're shopping for.
Frequently asked questions
What is the main difference between the Buddy and Big Buddy?
The Big Buddy reaches 18,000 BTU and covers up to 450 square feet, while the Portable Buddy reaches 9,000 BTU and covers about 225 square feet. The Big Buddy also has a built-in fan and weighs 14.1 pounds; the Portable Buddy weighs 7.1 pounds.
Is the Mr. Heater Portable Buddy approved for indoor use?
Approval depends on the exact model and location. The Portable Buddy Midnight is described as approved for indoor and outdoor use, with indoor use not approved in Canada or Massachusetts.
The standard Portable Buddy data here states outdoor approval, so check the exact heater's instructions and local rules.
Can the Buddy and Big Buddy use a 20 lb propane tank?
The Big Buddy can connect to a 20 lb tank with an optional Buddy hose and fuel filter. The Portable Buddy descriptions also mention a 20 lb tank connection using Buddy accessories or an optional hose and filter.
Use only authorized accessories and follow the heater manual.
Which heater is easier to carry?
The Portable Buddy is easier to carry by weight: the two listed versions weigh 7.1 pounds, compared with 14.1 pounds for the Big Buddy. Both have portability features, but the Big Buddy also includes a reinforced wire guard and easy-grip handle.
Does the Big Buddy need electricity?
The Big Buddy has a built-in fan and electronic ignition, but the supplied facts do not specify its power requirements. The Portable Buddy Midnight is explicitly described as providing radiant heat without electricity.
Check the manual for the exact Big Buddy model and setup.
