I purchased the Modine a couple years ago, think it’s 40,000 BTU for an oversized 3 stall. Heats real nice. Keep the garage at 55, unless I am going to be in it for extended hours. Heats it up to 65 in about 30 minutes.
Cost was about $600, being my good buddy has a heating and cooling business, I paid for the heater and parts only.
Its good to know the right people.