Author: steveng Unfortunately, there is little space under the cowl of modern outboards to allow for a heater to be installed. The good news is that most outboard engines are self-draining and don’t require freeze protection. Be sure to check your owners manual to see what steps you should take to prepare your outboard motor for a freeze. We do have customers with outboard powered boats, that use our heaters to protect bait tank plumbing, heads, sinks, etc. Was this answer helpful ? Yes (0) / No (0) Does the heater keep people warm or just equipment? Can I use an extension cord or power strip for the heater?