Mr. Heater F299720 Review: Heats 500 sq. ft. With Battery Ignition

What the F299720 Is, and Who For

Mr. Heater F299720 Propane Heater heats with 20,000 BTU/HR for you if you need wall-mounted indoor propane heat for a room-sized space.

If your room needs a wall-mounted heater and you want no venting or chimney, a propane unit with electronic ignition changes the setup you should look for.

Mr. Heater F299720 matches that situation with 20,000 BTU/HR and a battery operated electronic ignition. The model also states indoor use, propane fuel, and ODS low oxygen safety shut-off control.

We screened 31 Propane Heaters and this is one of 15 chosen for a full review. Full reviews go to the most-rated products that pass screening, at most 2 per brand. This one has 2,726 buyer ratings, the 2nd most of the 31 screened. This review is for you if you are comparing wall-mounted indoor units for a bedroom or living room.

The Short Answer on the F299720

Best for: you need 20,000 BTU/HR for a room or cabin that stays within the 700 sq. ft. coverage claim.

Choose the F299720 if you want wall-mounted propane heat with electronic ignition and no electricity required, at around $251.58.

• Pro: The 20,000 BTU/HR output gives you enough heat for the easier end of a small off-grid cabin job.
• Pro: The 700 sq. ft. maximum heating area suits larger single-room use better than compact emergency units.
• Pro: ODS low oxygen safety shut-off control adds a listed safety cutoff for indoor use.
• Con: The 500 sq. ft. heating coverage is tighter than the 700 sq. ft. maximum, so larger spaces need careful sizing.
• Con: A 4.4 average from 2,726 buyer ratings is useful context, but it does not offset the fact that 20,000 BTU/HR is not enough for a larger garage.

Don’t buy this if: you need a single heater for a larger garage or open area that calls for 25,000 to 35,000 BTU/h.

Price assessment: Around $251.58 is fair for a wall-mounted propane heater with electronic ignition and thermostat control.

The Numbers on the Spec Sheet

Coverage area most separates F299720 here. It measures the floor area the heater is intended to warm.

Before You Buy: Propane Heater Checklist

The first thing to check is whether your room needs a wall-mounted propane heater with no venting or chimney, because the F299720 is listed for indoor use and a fixed wall mount.

• ☐ Confirm the room is one you want to heat permanently — wall mount — or you will need to return it and buy a portable unit instead.
• ☐ Check that your space calls for 20,000 BTU/HR — 700 sq. ft. maximum heating area — or you may end up with oxygen depletion shutdown nuisance in a larger room.
• ☐ Measure the room against the 500 sq. ft. heating coverage — 500 sq. ft. — or you may live with a heater that does not match the area you planned to warm.
• ☐ Confirm you want propane fuel — propane — or you will have to re-buy a different heater for another fuel source.
• ☐ Check that battery ignition suits your setup — battery operated electronic ignition, one AAA battery included — or you will need to source and manage that battery before use.
• ☐ Budget for indoor room heating with ODS low oxygen safety shut-off control — ODS low oxygen safety shut-off control — or you may be left with a unit that trips off before the space feels warm enough.

Do not buy this if you need a movable heater for different rooms, because the wall-mount format keeps it in one place.

Explore other heating options by viewing the various propane heater alternatives.

Performance in Practical Terms for This Propane Heater

What 20,000 BTU/HR Means for Heating Output

You want enough heat to keep a room usable, and F299720 states 20,000 BTU/HR. That output is enough for one room during a few hours without power, and it also fits the easier end of a multi-day cabin outage.

That same figure is not enough for a larger garage or a big barn, so this model suits tighter spaces better than open ones. The 20,000 BTU/HR rating also puts it in the range where room heating is meaningful, while still leaving larger open-area jobs to bigger units.

How 700 sq. ft. Coverage Range Fits Small Spaces

F299720 gives a stated heating area of 700 sq. ft., with 500 sq. ft. also listed as heating coverage. That range points to a single-room or small-zone use case, where you are trying to warm living space rather than a wide shop floor.

If your space sits near the upper end of that range, measure the room you actually need to heat, not the whole floor plan. A 700 sq. ft. figure leaves less room for open layouts, so a larger garage or workshop calls for a higher-output heater than this one.

Why ODS Low Oxygen Safety Shut-Off Matters Indoors

F299720 includes an ODS low oxygen safety shut-off control, which is the feature that matters when you are heating indoors. The listing also states no venting or chimney is required, so this is the kind of propane heater that belongs in spaces where indoor use is the goal.

That same safety setup does not remove the need to match the heater to the room and keep an eye on indoor conditions. If you are comparing vent-free propane heater options, the oxygen depletion sensor is one of the features that separates room-heating models from simpler portable units.

The F299720 Job by Job: What Its Figures Cover

The F299720 against the jobs buyers ask about, worked out from its listed heat output and a typical need for each job.

Where the F299720 Sits Among the Alternatives

F299720’s clearest edge is heat output. It states 20,000 BTU/HR and a maximum heating area of 700 sq. ft., which puts it in the room-heating tier for many spaces without stepping into the larger-output class.

• Heater 400,000 BTU Propane Heater, F299720 is the room-sized option. The comparison is 20,000 BTU/HR versus 250,000 to 400,000 BTU per hour, so the two serve very different spaces.
• Against the Mr. F299730 emits 30,000 BTU/hr and uses battery-operated electronic ignition, while F299720 uses battery-operated electronic ignition too.
• Against the DEWALT DXH70CSFAVX 70000-BTU Heater, F299720 is the smaller-output pick. DEWALT states 70,000 BTU/HR and heats up to 1,750 sq ft, so it suits much larger areas.
• Against the Mr. Heater Vent Free Radiant Propane Heater, F299720 offers more output and more stated coverage. The vent-free radiant model lists 10,000 BTU/HR and heats up to 300 sq ft.

If you need a heater for a much larger garage or open work area, pick the DEWALT DXH70CSFAVX instead. Its 70,000 BTU/HR and 1,750 sq ft rating suit a bigger space than F299720’s 20,000 BTU/HR and 700 sq. ft. figure.

If you require more heating power, see our full review of the F299730.

Smaller spaces might prefer the PAULINN 6000 to 18000 BTU spec breakdown.

What It Takes to Run the F299720

Getting F299720 ready for wall mounting

Propane is the fuel F299720 needs before it does anything useful.

1. Unpack the heater and confirm the wall-mount format fits the space you measured for a 700 sq. ft. heating area.
2. Install the AAA battery in the battery-operated electronic ignition, since the heater uses no electricity from the room.
3. Connect a propane hose to a propane cylinder that matches the fuel inlet for propane service.
4. Set the wall mount in the room you want to heat, since the unit is listed for indoor use in bedrooms and living rooms.
5. Use the electronic ignition and thermostat control to start the heater and set the temperature you want.

Warranty and support: what to check for F299720

Cover differs by seller and country.

• Confirm the return window before you keep it, because the 20,000 BTU/HR output and 700 sq. ft. area make this a room-specific purchase.
• Confirm whether the propane hose is included, because the heater needs propane connection hardware to run.
• Confirm whether the AAA battery is included and unopened, because the electronic ignition depends on that single battery.

On the day it arrives, open the box and verify the battery, mounting parts, and propane connection pieces before your return window closes.

For heavy-duty industrial heating, consider the BILT HARD 85000 BTU Heater review.

Questions Buyers Ask About This Propane Heater

How much propane will F299720 burn, and what kind of runtime should I expect from a tank?

That means you can judge heat output from the BTU figure, while tank life still depends on the cylinder size you choose and the setting you run. A 1 lb cylinder and a 20 lb cylinder will not give the same runtime.

What does the 700 sq. ft. coverage area mean for a room?

F299720 lists 700 sq. ft. as its maximum heating area and 500 sq. ft. as its heating coverage. That split tells you the listing gives two room-size figures, and the smaller one is the more conservative number to plan around. For a larger garage, the 20,000 BTU/HR output is the more relevant limit than the coverage label.

Does F299720 need electricity to run?

Yes, the F299720 does not require electricity for heat generation, and it uses battery operated electronic ignition instead. One AAA battery is included, so the ignition still needs a battery even though the heater itself does not need mains power. That matters for outage use, because the heat source and the ignition source are not the same thing.

Is F299720 a wall-mounted indoor propane heater?

Yes, the F299720 is a wall mount propane heater for indoor use. The listing also names a cabinet form factor, radiant burner type, and no venting or chimney required. Those details point to a fixed-room heater, not a portable cylinder unit.

You can learn more about the technology in our guide on how a propane heater works.

Is the F299720 Right for You?

Who the F299720 suits and the jobs it is the wrong choice for, listed below with the reason for each.

Where to Buy This Propane Heater

Propane heaters are sold by the retailers below – we do not track which of them has the F299720 in stock, so check availability and the current price with the retailer before making a trip.

• Home Depot (online and physical stores) — broad range of propane heaters and in-store returns
• Lowe’s (online and physical stores) — broad range of propane heaters and in-store returns
• Tractor Supply Co. (online and physical stores) — useful for rural-oriented heating gear and specialist staff
• Northern Tool + Equipment (online and physical stores) — breadth of range for jobsite and utility heaters
• Ace Hardware (online and physical stores) — local-store convenience and in-store returns
• Walmart (online and physical stores) — broad mass-market selection and easy pickup options
• Amazon (online only) — breadth of range across many brands and models

Final Verdict on the F299720

You need a wall-mounted propane heater for indoor rooms, and 20,000 BTU/HR is the right scale for that job. F299720 is around $251.58.

That makes the coverage claim concrete for a bedroom or living room, and the electronic ignition plus AAA battery power keep the setup simple on the spec sheet.

Skip it if: you need a heater for a larger garage, or you want more than 20,000 BTU/HR for a big open space.