You are rather limited in your choices for a marine stove or heater that burns solid fuel. For obvious reasons, most boats do not use a solid fuel.
It sounds, however, like you are trying to heat a small cabin, tiny home or perhaps a houseboat…
The Newport is unique in that it is bulkhead mounted.
Here is an article on Extremely Tiny Woodstoves.
Navigator Stove Works builds beautiful (although expensive) stoves.
I have used the Shanty Stove and it is affordable and heats well.
There are also the stoves made by Shipmate Stoves
The Dickinson Newport Solid Fuel is hard to beat as a heater - it is efficient and mounts off the floor, out of the way - but it is not a stove. If you are willing to order from Europe or Canada, there are a number of stove suppliers for small cabins located there. Honestly, those are even dwindling as we send a number of Newport Diesel Heaters to Norway, Canada and Sweden every year. Pound for pound, diesel fuel is hard to beat and easy to use.