I have a detached garage, so running the boiler to the garage would cost a pretty penny between a unit heater, more insulated underground pipe, a separate pump, WxW heat exchanger, glycol, etc. I will do it eventually, but not today.
I have a 2 car garage built out of cinder blocks and an additional 8' on the side for work space. 8' ceilings, 2 old wooden garage doors that don't seal very well to the walls, and very little insulation between the ceiling and the attic space above. I will also eventually replace the garage doors with insulated versions that seal well and I intend on insulating inside the garage, too. I'll likely insulate before I run my boiler out there.
Anyways...
Northern Tool has this 240v electric unit heater on sale for $80. It's 17,065 BTU. The garage has it's own 200A service and I can easily wire this heater in to the panel. I realize that the 17k BTU won't HEAT the garage, but if I'm only using it on days I'm actually in the garage, it should take the chill off, right? On a 5 degree day last week, I ran my kerosene stand up heater and turned on 4 big halogen work lights and brought the garage up to about 40 degrees over a few hours.
https://www.northerntool.com/shop/tools/product_200578579_200578579Is this worth the $80 for my garage or should I focus my money on something better like a Salamander? I have dirt bikes, motorcycles, and sometimes a gas can in the garage along with my car. I try to be careful when I use the kerosene heater because the potential for gas fumes easily exists and flame based heat keeps me antsy.