I assume you have a diesel engine on the boat?

You might want to consider diesel appliances from companies like Wallas et al. There are diesel cooktops, heaters, ovens, and even cooktops that can be used as heaters.

Why? It allows you to have a boat with no dangerous fuels on board. No propane, no gas, etc. Just safe old diesel you already have.

The cooktops are safe, super clean (no internal fumes like propane etc), and long lasting.