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 social — heat your outdoor moments like a pro!

EFFORTLESS IGNITION - Push-button TE valve for instant startup, plus match-lit backup for any situation.
SAFETY FIRST DESIGN - Automatic tip-over shut-off ensures peace of mind during every use.
360 RADIANT WARMTH - Experience full-circle heat with a 540° burner and 180° swivel for maximum coverage.
LEAK FREE CONNECTION - Soft nose POL fitting guarantees a secure, dependable propane seal every time.
CUSTOMIZABLE HEAT POWER - Choose from 3 precise BTU settings (30K, 36K, 45K) to tailor your outdoor comfort.

The Mr. Heater 540 Degree Tank Top Heater delivers powerful, adjustable propane heat up to 45,000 BTUs with 540° radiant coverage. Designed for outdoor use, it features a 360° burner, 180° swivel bracket, and essential safety shut-offs. Its secure POL connection and easy push-button ignition make it a reliable, efficient solution for warming patios, decks, and outdoor workspaces.

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Brand	Mr. Heater
Special Feature	Adjustable Temperature, Adjustable Tilt Head, Noiseless, Tip-Over Protection
Colour	Multicolour
Form Factor	Dish
Indoor/Outdoor Usage	Outdoor
Product Dimensions	26.4D x 26.4W x 44.5H Centimeters
Recommended Uses For Product	Outdoor
Mounting Type	Floor Mount
Room Type	Bedroom, Home Office, Study Room
Heating Coverage	100 square feet
Burner type	Radiant
Fuel Type	Propane
Number of Speeds	3
Max Temperature Setting	540 Degrees Fahrenheit
UPC	089301000629
Global Trade Identification Number	00089301000629
Manufacturer	Mr. Heater Corporation
Country of Origin	USA
Item model number	MH540T
ASIN	B01BE8FVUK

Mr. Heater, Corporation Mr. Heater, 30,000 - 45,000 BTU 540 Dregree Tank Top Heater, by Mr. Heater

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