Here are some good space heaters for your boat that will keep you toasty. Boat heaters are needed to keep your pipes defrosted and your cabin heated. Below are a space heaters for a variety of uses.
When heating your boat, please be aware that heaters that have a glowing red coils are not a good choice for an unattended boat as they can cause a fire if they come to close to flammable objects or tip over. Be sure to secure your heater to keep it from moving around.
Optimus H-6003 Portable Oil Filled Radiator Heater, Mini Perfect for a small bedroom as on my boat where everything has to be small. This heater is tiny so I did not expect it to put out much heat. It would not heat a large room, but it does a wonderful job on a medium cabin. Since it does not have a fan it is quiet. So far I have not had to turn the heat setting past medium. I run the heater continuously and it keeps the room at a level temperature.
Saved my engine from damage after a low spring frost after I summarized. I mounted base to a cedar 1x6 that placed it heater down in my engine compartment and held in place by engine compartment lid. Senses temp and turns on automatically.