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.
Caframo Pali Engine Compartment Heater
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.
List of Affordable Space Heaters for Your Boat