Vented units can be installed by anyone who knows how to run exhaust lines, while ventless units require no installation expertise. However, experts differ on whether ventless models are safe to use.
Gas garage heaters require a connection to a gas line. If one is not already in the garage, expert help is typically needed and sometimes required by local regulations. Vented models are hooked up to the gas line, and their exhaust system must be installed, which may require moderate construction ability. While ventless models simply need to be plugged in and connected to a gas line, their safety sensors might not be able to detect the formation of carbon monoxide, especially if the garage is dusty or filled with sawdust. A carbon monoxide detector provides warning if the unit is not operating safely.