Winter Power Outage Propane Heater Compared: Starts At 20,000 BTU and Vents None

The Verdict, and the Basis for It

If your heat source has to work during a winter outage, a wall-mounted unit with electronic ignition avoids depending on electric startup, and that is the F299730’s practical edge.

Choose the F299730 if you want the 1,000 square feet coverage figure and a fixed wall install. Choose the F299720 if you want the same wall-mount approach with 20,000 BTU/HR instead. Choose the Big Buddy F274800 if you need a 1-lb fuel tank and a lighter-duty portable setup. The shortlist runs from $199.28 to $265.39.

We screened 31 propane heaters at Predicament Measures and kept 8 for this winter power outage roundup because we were looking for outage-ready heat, not just low prices. The median price of the 8 products in our comparison is $178.22, and the three picks span a higher-cost wall pair plus a lower-cost portable option.

If you need a heavy-duty unit, view our full PT-125V-GFA review.

Propane Heaters for A Winter Power Outage: Price, Rating and Specs Compared

Prices are approximate and move frequently – check the current price before deciding.

Among our top picks, the value leader is Mr. Heater F299730 30000 BTU, and that matters here because outage heating should balance cost with 30,000 BTU/hr output.

Each Pick for A Winter Power Outage, Reviewed

The 3 picks below run from $199.28 to $265.39, reviewed in rank order.

Mr. Heater F299730 30000 BTU

When the power goes out on a cold night, this wall-mounted propane heater gives you 30,000 BTU/hr and a stated 1,000 square feet of coverage. That combination makes it the strongest fit here for a larger room or garage that needs backup heat without electricity.

What we like: Its 30,000 BTU/hr output is the highest among these three picks, and that matters because heat output is the number that drives how much warmth a heater can release each hour. The built-in thermostat, electronic ignition, and ODS safety sensor give you clear control points, and the unit states no electricity required. The $265.39 price sits above the other two picks, so you are paying more for the larger heating figure and the wider stated coverage.

Keep in mind: This model is wall-mounted, so it is not the most flexible choice if you want to move heat from room to room. Carry handle is not stated, so portability is not part of its spec set.

Mr. Heater F299720 20000 BTU

The F299720 is the mid-price option here for a winter outage when you want indoor propane heat for a room, not a whole building. It states 20,000 BTU/HR and a maximum heating area of 700 square feet, which gives you a smaller footprint than the 30,000 BTU model while still keeping the no-electricity setup.

What we like: Electronic ignition, a built-in thermostat, and an ODS low-oxygen shut-off control give this model the same core control package as the larger Mr. Heater pick. Its $251.58 price is lower than the 30,000 BTU unit, so it gives you a cheaper route to wall-mounted backup heat with a stated 700-square-foot maximum heating area. For a room-sized outage plan, 20,000 BTU/HR is enough heat output to matter without pushing you into the larger unit’s price.

Keep in mind: This is the better match when you are heating one room, not when you want the biggest output in the group. Carry handle is not stated, so you should not expect easy room-to-room carrying from the listing.

Mr. Heater Big Buddy F274800

The Big Buddy is the cheapest safe propane heater in this group for backup heat, with a $199.28 price and an 18,000 BTU/hr output. It also states heat coverage for up to 400 square feet, so it suits a smaller outage setup where portability matters more than whole-room reach.

What we like: The 1-lb fuel tank size makes this the most portable of the three, and that is useful when you want a heater you can move between spaces during a blackout. It also states an oxygen depletion sensor and a tip-over switch, which are the safety features most readers want to see in an indoor propane heater. Its 18,000 BTU/hr figure is still enough for a room during a few hours without power, and the price is the lowest of the three picks.

Keep in mind: This model gives up heating area and output to the two wall-mounted picks, so it is not the one to choose for a larger garage or open plan space. Carry handle is not stated, so portability is supported by the 1-lb format, not by a listed handle.

For a compact option, find our spec breakdown of the FC510P.

What Matters Most in a Propane Heater for A Winter Power Outage

Safe Indoor Use During Outages

Safe indoor use during outages starts with propane heaters that state indoor use, oxygen depletion protection, and no outdoor venting requirement. The F299730 and F299720 both state indoor use, electronic ignition, and an oxygen depletion sensor. Big Buddy F274800 also states an oxygen depletion sensor and tip-over switch, which matters when power is out and the room still needs heat. Think of the oxygen depletion sensor like a circuit breaker for air: it is a shutoff meant to react when oxygen gets too low. For indoor winter outage use, that safety filter set these apart more than price or ratings.

Heat Output For One Room

Heat output for one room should start around 10,000 BTU/h, because that is the point where room heating becomes meaningful in this category. F299730 states 30,000 BTU/hr, F299720 states 20,000 BTU/HR, and Big Buddy F274800 states 18,000 BTU/hr. BTU rating defines heating capacity, so this is the first number to weigh when your goal is one warm room during a blackout. The 30,000 BTU/hr model gives the most headroom for larger rooms, while the 18,000 BTU/hr unit is the lighter-duty choice of the three.

Match To Room Size And Insulation

Match to room size and insulation by pairing the heater’s coverage area with the space you actually need to warm. F299730 is listed for 1,000 square feet, F299720 for 700 square feet, and Big Buddy F274800 for 400 square feet. That spread is the clearest divider in this group, because room size changes the job faster than fuel type does. If your outage plan centers on a bigger garage or open area, the 1,000-square-foot figure gives the most room to work with.

Reliable ignition without electricity for a winter outage

Reliable ignition without electricity matters most when you want startup that does not depend on household power. F299730 and F299720 both state battery-operated electronic ignition, and each includes one AAA battery. Big Buddy F274800 does not state electronic ignition, but it does state propane use and a 1-lb cylinder connection. Piezo ignition affects ease of startup, but the listings here name electronic ignition on the two wall units rather than piezo. If you want the cleanest no-power startup signal from the data, the electronic-ignition pair is the clearer read.

Oxygen Depletion And Tip-Over Protection

Oxygen depletion and tip-over protection matter because these are the safety features first-time users usually use as a filter. For winter outage use, the safety question is not whether protection exists in general; it is whether the listing names the protection you want.

Portable indoor propane benchmark for this comparison

Mr. Heater Big Buddy F274800 is the portable indoor propane benchmark here, and it is known for 1-lb cylinder use and a 400-square-foot coverage figure. The picks on this page compare with that benchmark in different ways: F299730 and F299720 trade portability for wall mounting and higher stated coverage, while Big Buddy stays the most portable of the three. That split is useful if you want a heater you can move during a blackout instead of one that stays fixed to a wall.

Explore different ways to stay warm without propane if you need other options.

Each Job, What It Takes and How the Picks Do

Each row is a job this page’s buyers ask about, worked out from each pick’s listed heat output and a typical need for the job.

Each need is a typical figure for that job rather than a manufacturer claim, and the picks’ results come from their listed specifications. Where your job is bigger or smaller than the typical one, go by your own figure.

Who Buys Propane Heaters, and What It Really Costs

You can also see how the FC824P performs in our dedicated analysis.

Before the First Use, and After Delivery

What these propane heaters need before they work

All three picks need propane to run, and each one also needs the right connection path for its fuel source. The wall-mounted models use a propane cylinder through a compatible hose and regulator setup; the Big Buddy F274800 connects directly to two 1-lb disposable cylinders, or to a 20-lb cylinder with an optional hose.

• Mr. Heater F299730 30000 BTU states wall mounting, so you need a fixed place for a wall install and a propane supply at that location.
• F299720 also states wall mounting, and it uses a battery-operated electronic ignition with one AAA battery included. That means you still need propane, but not mains power.
• Big Buddy F274800 works with 1-lb cylinders, and it also states an optional hose for a 20-lb cylinder. That gives you a portable path if you already own the cylinders.
• F299730 and F299720 both state electronic ignition. Big Buddy F274800 does not state that ignition type, so its starting method is not answered by the listing data.

What to check on arrival for a winter outage heater

Coverage differs by seller and country, so verify the heater body, controls, and fuel connection parts as soon as the box arrives.

• Check that the heater arrived with the ignition parts it states. F299730 and F299720 both list AAA battery support, and F299720 explicitly includes one AAA battery.
• Confirm the fuel connection parts match your setup. Big Buddy F274800 states direct connection to two 1-lb cylinders, while its 20-lb hookup depends on an optional hose.
• Look over the safety features named in the listing. Oxygen depletion sensor matters for indoor use, and F299730, F299720, and Big Buddy F274800 all state it.
• Verify the mounting or placement plan before the return window closes. The two wall-mount models need a fixed location, while Big Buddy F274800 is the portable option in this group.

On the day it arrives, confirm the fuel connection, then set it aside with the cylinders or hose it needs before you need heat.

Questions Buyers Ask Before Choosing Propane Heaters for A Winter Power Outage

How long will a propane tank last on this heater?

Runtime on a propane tank depends on the tank size, the heat setting, and the heater’s BTU output. Big Buddy F274800 is the only pick here that states a 1-lb fuel tank size, so it is the one to compare first if portability matters more than long refills.

What size propane tank works best for emergency home heating?

The right propane tank size for emergency home heating depends on whether you want portability or fewer refills. Big Buddy F274800 uses a 1-lb tank format, while the two wall-mounted Mr. Heater models use propane without stating tank size in the data here.

Can I use this heater in a bedroom, garage, or small apartment?

Yes, the room type matters here, because the F299720 states bedroom and living room use, and the F299730 states indoor use with garage and greenhouse recommendations. Big Buddy F274800 states indoor use and up to 400 sq ft, so it fits a smaller outage space better than a whole-house plan.

What do I need besides the heater to use it during a blackout?

Besides the heater, you need propane, and the F299730 and F299720 both state battery-operated electronic ignition with one AAA battery included. Big Buddy F274800 states direct connection to two 1-lb disposable cylinders, and it also states an optional hose for a 20-lb cylinder.

Make sure to learn propane heater terms explained before making your final purchase.

Who Should Skip These Propane Heaters

If your job is heating a larger room during a winter power outage, these picks are not the right tier. They are sized for room heating, not the larger-space work that starts around the 30,000 BTU/h reference point.

For that use, move up to a higher-output vent-free heater or a direct-vent model built for larger rooms or open areas. If carbon monoxide buildup or oxygen depletion shutdown nuisance is your concern, choose a unit with the right safety controls and enough output for the space, or the wrong purchase can waste money on a return and leave you still cold.