...If you're going to replace it, the tough part is finding an 25K unit. You can get a 50KBTU unit heater for $800-1000 from PA and HD, it's bigger than your original and probably bigger than you need -- in a house that's a problem, in a garage it's not.
https://www.princessauto.com/en/500...r-with-lp-conversion-kit/product/PA0008944951
I went a different route with my garage up north, it cost me a few bucks more but it's been worth it. I installed a cold weather heat pump -- it cost $1400 and was super simple to install. In fact I just bought another for my detached garage at home, it's going to replace a 5KW electric garage heater (which is also a cheap option). 12000 BTU Mini Split Air Conditioner - Heat Pump - SENA/12HF. Nice benefits are AC garage in the summer, and there are no flames in the garage.
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