
A quick follow up on my attempts to heat my garage...
I have a double car attached garage to my house. It had electric floor heat in the slab that stopped working years ago. Last week I had an electrician come to the house and he rewired the box so I can get slab heat in the garage again. I have 4 heat lines out in the garage, but 1 line is burned out. Still, I figured 3 out 4 electric heat lines would help.
My goal for the electrical floor slab heat in the garage was to set the temperature at about 45F. That would be enough to melt off the ice and snow on the cars overnight. I am happy to say that the slab heat was maintaining the heat in the garage at 45F for the remainder of last week.
First problem solved. Next, I wanted to use my small 60,000 BTU propane heater to boost the temperature in the garage to about 55F so I could get my old bones out there and work comfortably with a jacket or sweatshirt.

I ran into a hiccup with the propane heater. I hooked up my 20lb BBQ propane tank to the heater. There was probably about 1/3 of the gas left in the BBQ tank. Unfortunatly, the heater ran only for a minute or two and stopped burning the gas and no heat was coming out of the heater. I lifted the tank and there was still a good amount of gas in the tank. So, I was thinking my heater died.

I hit YouTube to find out how to troubleshoot my heater and more specifically the gas regulator on the hose line. In one of the videos I watched, it mentioned that if a BBQ tank is left outside in extreme cold weather, and the tank is not full, that the pressure in the tank will drop to a point where the gas will not flow.

I had a spare BBQ tank outside that was full. So, I took it into the house overnight to let it warm up. The next morning, I hooked it up to my propane heater and everything worked beautifully!

I ran the heater on high, 60,000 BTU rate, for about 10 minutes. The temperature in the garage went from 45F to 56F in only 10 minutes. Then I shut off the heater. I broke down 6 pallets on the first day, then I de-nailed all the pallet wood on day 2. I also spent a good 4 hours cleaning up and organizing stuff in my garage. I was very comfortable with just a sweatshirt on. Anyways, much to my surprise, the garage is holding the heat. After 2 days, the garage is still sitting at 54F! Very nice!

I don't know the burn rate of the propane heater at the high 60,000 BTU setting, but I suspect it cost me less than $1.00 for 10 minutes burn time to get the garage heat up to 56F. That's worth every penny to me.
Of course, part of that success is because the outside the temperatures are getting above freezing in the daytime, and at night they are only going down to about 25F. A few weeks ago, we were hitting those -20F temperatures at night. That cold stretch has passed. Thankfully.
In conclusion, I have been putting hours of pallet project work out in my garage, in January, whereas I normally don't try to do anything in the garage until late March or April. Feels great to get some work done in the dead of winter. Later...
EDIT TO ADD: I found out that the burn rate of my 60,000 BTU propane heater is 7 hours on high for a 20 lb. propane tank. Given that I only ran the heater for 10 minutes, I could get 6 heating sessions per hour, or 42 10-minute heating sessions per tank. A refill on a tank is less than $15.00, but let's take $15.00/42 10-minute heating sessions and you get 25 cents for a 10 minute burn. Or, $1.50 per hour of burn time on the 60,000 BTU high setting. Even better, I had to burn the gas for 10 minutes to go from 45F to 56F. My garage is still sitting at 54F 2 days later, so I suspect it would not take very long to boost the heat a few degrees if I needed it. Maybe only a few minutes at most.