I have a Pro Com vent-free, propane gas, log heater from Harbor Freight with a BTU rating of 20,000 - 30,000 that I plan to use in a garage with a 20 lb. gas cylinder. Will a standard gas grill regulator work? Or do I have to buy a different type of regulator. I have a spare gas grill regulator, so I was hoping to use it. Thanks for any info.