How long will a cylinder propane last period?

Propane weighs about 4.2 pounds per gallon. So a 20#cylinder holds 4 1/2 to 4 3/4 gallons of propane. A gallon of propane stores about 92,000 BTUH’s, (+/-). So in rough figures, if the head consumes 45,000 BTUH, you can get 2 hours per gallon, (8 hours per tank) or a bit more, when using on high. It’s just math: Med is 30,000, so 3 hours per gallon, low is 15,000, so six. Mine seems to run longer times than that, so I assume it’s burning at a somewhat lower rate than listed.

will it heat a 3 stall garage?

It will heat my 30' x 25' garage with 12' ceilings no problem, I have insulated walls but nothing for the ceiling. I have to turn it down after awhile, which the lowest setting is sometimes still too high, and I have to turn down the propane at the cylinder haha. I use it to keep the temperature at around 50 degrees when it is 20 or colder outside. But, though a bit costly, it really is a great heater...just keep it several feet away from plastic items.. I know from experience.

how much propane does this use when on high

Not sure how much per minute or hour but on high for a 20lb tank it last about 8 hours

How many hours of heat on low/high from a full 20lb tank?

This unit burns a lot of propane. On high, I get about 10 hours from a 7 gallon propane tank. Doing the math this burns about 1.413 hours per pound of propane. In general, all 30,000 BTU heaters will use the same amount of propane as any other 30,000 BTU heater. The number of BTU's produced from burning propane will be the same regardless of brand.

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🔥 Stay warm, stay ahead — heat your space like a pro!

SAFETY FIRST - Built-in tip-over shut-off switch ensures peace of mind during every use.
LONG LASTING WARMTH - Enjoy nearly 10 hours of continuous heat on a single 20 lb propane tank.
CUSTOMIZABLE COMFORT - Multi-directional radiant heat with adjustable tilt head targets warmth exactly where you need it.
POWERFUL HEAT CONTROL - Adjust between 30,000, 36,000, and 45,000 BTUs to suit your space and mood.
EFFORTLESS PORTABILITY - Mounts directly on 20-100 lb propane tanks for ultimate mobility and convenience.

The Mr. Heater MH450T Tank Top Heater delivers versatile, high-output radiant heat with up to 45,000 BTUs. Designed for portability, it mounts directly on propane tanks ranging from 20 to 100 lbs, offering nearly 9.5 hours of runtime on high with a 20 lb tank. Safety is prioritized with a tip-over shut-off switch, while the adjustable tilt head ensures targeted warmth, making it an essential climate control solution for any outdoor or indoor setting.

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Brand	Mr. Heater
Model Number	F242540
Color	Chrome
Product Dimensions	26.42 x 26.42 x 44.45 cm; 2.49 kg
Material	Other
Auto Shutoff	No
Number of Speeds	3
Special Features	Adjustable Tilt Head
Item Weight	2.49 Kilograms

Mr. Heater MH450T Tank Top Heater, One Size, Chrome

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