Beacon Morris Garage Heater Size Picker
Beacon Morris makes its BRT low-profile garage heater in seven sizes, from 30,000 to 120,000 BTU/hr input. Enter your garage to see which one covers its heat loss, with altitude, mounting height, heat throw and the cost per hour on gas or propane.
Your garage
Beacon Morris size for your garage
BRT030: 30,000 BTU/hr input
Your garage needs about 24,500 BTU/hr of heat at 20°F. The BRT030 delivers 24,900 BTU/hr, the smallest BRT that covers it.
BRT sizes at a glance
The number in the model name is the input in thousands of BTU per hour: the BRT045 burns 45,000 BTU/hr and delivers 37,350 BTU/hr into the garage, 83%. Size by the output and compare it with your garage's heat loss, not its floor area.
- BRT030: 30,000 BTU/hr input, 24,900 output (83%), 370 CFM, 3.2 A at 120 V, heat throw about 33 ft hung at 8 ft or 28 ft at 10 ft, about 60 lb.
- BRT045: 45,000 BTU/hr input, 37,350 output (83%), 550 CFM, 3.2 A at 120 V, heat throw about 33 ft hung at 8 ft or 28 ft at 10 ft, about 65 lb.
- BRT060: 60,000 BTU/hr input, 49,800 output (83%), 740 CFM, 4.1 A at 120 V, heat throw about 33 ft hung at 8 ft or 28 ft at 10 ft, about 80 lb.
- BRT075: 75,000 BTU/hr input, 61,500 output (82%), 920 CFM, 4.1 A at 120 V, heat throw about 40 ft hung at 8 ft or 35 ft at 10 ft, about 85 lb.
- BRT090: 90,000 BTU/hr input, 73,800 output (82%), 1,100 CFM, 6.4 A at 120 V, heat throw about 40 ft hung at 8 ft or 35 ft at 10 ft, about 95 lb.
- BRT105: 105,000 BTU/hr input, 86,100 output (82%), 1,300 CFM, 6.4 A at 120 V, heat throw about 60 ft hung at 8 ft or 54 ft at 10 ft, about 105 lb.
- BRT120: 120,000 BTU/hr input, 98,400 output (82%), 1,475 CFM, 6.4 A at 120 V, heat throw about 65 ft hung at 8 ft or 56 ft at 10 ft, about 110 lb.
For our default 3-car garage, 32 × 24 ft with some insulation, the picker lands on the BRT045; a 30 × 40 ft shop with a 12 ft ceiling needs the BRT105. Performance figures come from the 2023 spec sheet. Heat throw is the 2018 catalog's approximate figure, measured from the floor to the bottom of the heater; the catalog does not recommend hanging the 30 to 90 sizes at 12 ft or higher.
Before you buy one
A BRT is a vented gas heater: it needs a gas or propane supply line, a 120 V circuit for the fan and power venter, and a 4 inch vent through the wall or roof (5 inch on the 90 to 120 sizes when converted to separated combustion). Those, not the heater, are most of the installed cost. Our garage heater installation cost page prices each part.
Beacon Morris ships a gas conversion kit with every unit, offers two-stage gas on the 60 to 120 sizes, and lists a 10-year heat exchanger warranty. In a woodshop or paint area, the optional combustion air inlet kit converts it to separated combustion, so it draws its combustion air from outside. Add a carbon monoxide alarm, as with any fuel-burning heater, and follow the clearances in the installation manual.
We have not tested Beacon Morris heaters, and this page has no affiliate links. Sizes are matched to our own heat-loss estimate, never to a maker coverage claim. If there is no gas at the garage, compare it with an electric heater in gas vs electric first.
Questions people ask
What size Beacon Morris heater do I need for a 2-car garage?
For a 24 × 24 ft garage with some insulation, kept at 60°F on a 20°F night, our model puts the heat loss at about 24,500 BTU/hr, so the BRT030 (24,900 BTU/hr output) just covers it. The same garage with bare walls needs about 37,000 BTU/hr, which points to the BRT045. Colder towns and higher ceilings push the size up, so enter your own garage above.
Is a Beacon Morris BRT approved for a home garage?
Yes. Beacon Morris lists the BRT as ETL certified for residential use as a garage utility heater, as well as for commercial and industrial buildings. Follow the installation manual and your local gas code for mounting height, clearances and venting.
How much gas does a Beacon Morris BRT use?
With the burner on it burns its input rating: a BRT045 burns 45,000 BTU an hour, about 0.45 therms of natural gas or 0.49 gallons of propane. At 2025 U.S. average prices that is about $0.67 an hour on natural gas or $1.26 on propane. A heater sized for your garage runs only part of each hour once the garage is warm.
Can a Beacon Morris BRT run on propane?
Yes. Each size is built for natural gas or propane, and Beacon Morris includes a gas conversion kit with every unit. The cost per hour is higher on propane at average U.S. prices.
What is the difference between a Beacon Morris BRT and a Modine Hot Dawg?
Both are low-profile, power-vented gas unit heaters sold for garages, with about 82 to 83% thermal efficiency. Their outputs are close: the BRT060 delivers 49,800 BTU/hr, the same as Modine's 2026 figure for the HD60. The BRT comes in seven sizes from 30,000 to 120,000 BTU/hr input, uses a 4 inch vent on every size, and can be field converted to separated combustion with a kit. Compare sizes in the Hot Dawg picker.
Does altitude change the Beacon Morris size?
Above 2,000 ft it does. Beacon Morris says to derate the input 4% for each 1,000 ft above sea level for U.S. installations (Canada follows the ETL rating plate for 2,000 to 4,500 ft). At 5,000 ft that is 20% less heat, so set your elevation in the picker.
Sources
Sources last checked November 13, 2026.
- Beacon Morris, Model BRT gas-fired unit heater spec sheet BRTPD-5R (September 2023) · Input, output, efficiency, CFM, amps, vent sizes, weight, altitude derating, residential certification
- Beacon Morris, tubular gas-fired unit heaters catalog BTUC-13 (September 2018) · Heat throw by mounting height, standard applications