Best Indoor Propane Heaters For Large Rooms

Quick Overview

Mr. Heater MHVFBF20LPT 20,000 BTU Blue Flame Heater

Pumps out 20,000 BTUs for spaces up to 700 sq. ft.
Comes with thermostat control and auto shut-off for safety.
Mount it on the wall or use freestanding—no permanent setup needed.

Mr. Heater Big Buddy Pro Series Portable Heater

18,000 BTUs for 450 sq. ft. areas.
Built for indoor and outdoor use.
Auto shut-off if it tips over or senses low oxygen.
Runs on propane tanks (not included).

Propane Heater with 3 Settings (6000-18000 BTU)

Adjustable heat with three modes.
Roll it anywhere on locking casters.
Quiet operation (32dB) and tip-over protection.
Works for garages, camping, or backyard hangs.

Mr. Heater Hunting Buddy Portable Heater

12,000 BTUs for deer stands, tents, or small shops.
Switch between disposable tanks or remote gas lines.
Low-oxygen shut-off keeps things safe.
Compact enough to throw in a truck bed.

WELLUCK Propane Heater with 3 Power Settings

18,000 BTUs, no electricity needed.
Folds up for storage and rolls on 360° casters.
Runs 69 hours on low setting.
ODS safety and quiet enough for reading.

Comparison Table

Product Name	Key Features	Price	Rating
Mr. Heater MHVFBF20LPT	20,000 BTU Thermostat control ODS safety Wall or floor use	$170.00	4.4
Mr. Heater Big Buddy Pro	18,000 BTU Indoor/outdoor Auto shut-off Three heat levels	$119.99	4.6
Propane Heater 3 Settings	6000-18000 BTU 32dB noise Locking casters Tip-over protection	$149.99	4.5
Mr. Heater Hunting Buddy	12,000 BTU Hi-Low settings Swivel regulator Compact design	Not listed	4.6
WELLUCK Propane Heater	18,000 BTU No electricity Folds for storage 69-hour runtime	$121.95	4.3

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Mr. Heater MHVFBF20LPT 20,000 BTU Blue Flame Vent Free Propane Heater

Features

• 20,000 BTU output heats up to 700 sq. ft.
• Thermostat control with battery-powered ignition
• Automatic oxygen shut-off system (ODS)
• Blue flame convection heating warms air, not objects
• Works mounted or freestanding with included legs

What’s Good

• Heats small spaces fast
• Fuel-efficient at 0.926 lbs propane/hour
• No wall-mount requirement
• Works at high elevations up to 4,500 ft

What’s Not

• Assembly frustrations reported
• Mixed feedback on noise and flame visibility

Price

$170.00

What Customers Are Saying

Users love how fast this heater warps up garages and cabins. The thermostat keeps temps steady without babysitting. Several mention saving money on fuel compared to older heaters. Complaints focus on tricky assembly steps and debates about whether the flame looks “natural” enough.

Final Recommendation

This heater kills it for garage workshops or cabins needing fast, whole-room warmth. The blue flame design mimics central heating better than radiant options. If you want fuel savings without permanent installation, it’s a no-brainer. For safety-conscious buyers, check how wall-mounted heaters compare safety-wise. If electricity costs worry you, see why propane often beats electric models in long-term savings.

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Mr. Heater 18,000 BTU Big Buddy Pro Series Portable Propane Heater

This indoor propane heater is built for large rooms up to 450 sq ft.

Features

• 18,000 BTU output with adjustable low/medium/high settings
• Auto shut-off for tip-over, low oxygen, or flame failure
• Works at altitudes below 7,000 FT
• Connect to propane tanks (tank not included)
• 220-hour max runtime per tank

What’s Good

• Military-grade safety features
• Portable design with handle
• No electricity needed
• Clean burning with 99% efficiency

What’s Not

• Fan removed from recent models
• Not for high-altitude use above 7,000 FT
• Propane tank sold separately

Price

$119.99

What Customers are Saying

Users report it heats large spaces fast with zero fumes.
Many love the safety sensors and easy ignition.
Some mention the fan is quieter than expected.
A few had issues lighting it in extremely cold weather.

Final Recommendation

Get the Mr. Heater Big Buddy Pro if you need reliable heat for warehouses, garages, or open-concept living areas.
It’s the safest bet for families with kids/pets due to its triple automatic shut-off system.
The price-to-performance ratio beats most competitors in the best indoor propane heaters for large rooms category.

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Best Indoor Propane Heaters for Large Rooms

Propane Heater, 6000 to 18000 BTU 3 Setting Propane Tank Heater with Regulator

Features:

• 3 heat settings (6000 to 18000 BTU)
• Covers up to 450 sq. ft.
• Portable design with 5 locking casters
• Tip-over protection and low oxygen shut-off
• Weather-resistant build
• 32dB noise level for quiet operation

What’s Good:

• Heats large spaces fast
• Easy to move around
• Silent compared to most heaters
• Safety features prevent accidents

What’s Not:

• Propane tank not included
• Not ideal for very cold climates

Price:

$149.99

Rating:

4.5/5

What Customers Are Saying:

Users love how fast this heater warms up their garages and workshops. Many mention it’s compact but packs a punch, and the quiet operation gets praised. Some wish it included a propane tank.

Final Recommendation

This propane heater is the go-to for heating large indoor spaces like garages. It’s portable, safe, and silent. If you need reliable heat without the noise, grab this one.

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Mr. Heater MH12HB Hunting Buddy Portable Propane Heater

Features:

• 12,000 BTU per hour for spaces up to 300 sq. ft.
• Low oxygen shut-off system (ODS) and tip-over safety shut-off.
• Works with disposable propane tanks or remote gas supply (hose/filter sold separately).
• Adjustable heat settings from 6,000 to 12,000 BTU.
• Portable design for indoor/outdoor use in cabins, patios, or tailgating.

What’s Good:

• Compact and easy to move around.
• Safety features prevent accidents.
• Flexible fuel options with swivel regulator.
• Electric start adds convenience.

What’s Not:

• Mixed feedback on build quality and noise.
• Not ideal for heating very large rooms beyond 300 sq. ft.
• Accessories like hoses or filters cost extra.

Price: Check latest price on Amazon.

What Customers Are Saying:

• Users say it heats sheds or small shops well.
• Good value with storage for extra tanks and gloves.
• Some mention inconsistent build quality and flame speed.
• Noise levels vary depending on usage.

Final Recommendation

Pick the Mr. Heater MH12HB if you need a portable propane heater for small spaces like sheds, cabins, or tailgating setups.

It’s not the best indoor propane heater for large rooms over 300 sq. ft., but it’s a reliable backup for targeted warmth.

Go with this for safety features and portability—just grab extra fuel tanks for longer use.

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WELLUCK Propane Heater

Price: $121.95

Features

• 3 heating modes (6,000/12,000/18,000 BTU)
• Covers up to 450 sq. ft
• No electricity required
• Built-in casters for portability
• Foldable design for space-saving
• 32dB noise level
• Automatic shut-off for tip-overs or low oxygen

What’s Good

• Strong heat output for large spaces
• Runs up to 69 hours on low setting
• Compact and easy to move
• Multiple safety features
• Affordable price for performance

What’s Not

• Pilot light issues reported
• Requires manual ignition
• Not ideal for extremely drafty areas

What Customers are Saying

Users love the heat output and portability.
Many mention it’s easy to assemble and feels sturdy.
The price-to-quality ratio gets praised.
Safety features like automatic shut-off add peace of mind.
Some struggle with keeping the pilot light lit consistently.

Final Recommendation

Pick the WELLUCK heater if you need reliable warmth for large rooms up to 450 sq. ft.
It’s a steal for the price with safety features and portability.
Perfect for garages, workshops, or backup heating during outages.
Just keep a lighter handy for the pilot light.

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Are propane heaters safe to use indoors?

Absolutely, but only if they’re built with the right safety features.

All three models here come with auto shut-off if oxygen levels drop or if the unit tips over.

The Mr. Heater Blue Flame even uses a convection system that mimics your home’s central heating.

No open flames, no weird smells – just consistent warmth.

Proper ventilation is still key, though.

How much space can these heaters actually warm?

Depends on the BTU output and your space’s layout.

The 20,000 BTU Blue Flame handles up to 700 sq. ft. – perfect for garages or large rooms.

The Buddy Pro and portable 18K BTU model cover 450 sq. ft., ideal for workshops or camping setups.

Insulation matters more than square footage.

Drafty room? Size up.

Will running a propane heater spike my energy bills?

Propane is often cheaper than electric heating, especially in well-insulated spaces.

The Blue Flame uses .926 lbs of propane per hour – roughly $1.50/hour at current rates.

Compare that to electric heaters guzzling 1,500+ watts.

Want the full breakdown? We’ve got detailed cost comparisons on propane vs electric efficiency.

Can I move these heaters between rooms easily?

Some yes, some no.

The portable model with locking casters? Roll it wherever.

The Blue Flame needs wall mounting, but comes with legs for temporary setups.

Buddy Pro sits on the floor but weighs under 20 lbs – carry it to your deer blind or ice fishing tent.

What’s the difference between blue flame and radiant heating?

Blue flame heaters warm the air (like your furnace), making them better for longer sessions.

Radiant models heat objects directly – faster feel, but less even distribution.

Think “all-day comfort” vs “quick takeoff.”

Check our guide on heating types to match your needs.