(continued from previous)
One downside about your construction however, is that I think many of us have been assuming that you had a fairly typical American level of insulation, as opposed to what you are describing as basically non-insulated...
This means that you might need a MUCH bigger stove than we would to heat the same amount since you don't have any insulation. A stove like what you are looking at might help, but not let you reach quite the levels of comfort you want when it gets down to your lower temperatures.
However, this is still speculation on my part, and your dealer probably has more knowledge about what is appropriate for your conditions. I would try to talk to any other people you can that are trying to heat similar size spaces with that size of stove to see if it actually works for them.
Another option that you might consider, though it might not be practical for you (I'm not sure) is a MASONRY HEATER. In some ways what you describe almost begs for one. A masonry heater is designed to run short hot fires, so it is almost impossible to over fire, and at the same time is less fussy about wood quality, so the pallet wood is potentially much less of an issue. It is actually a modern version of the heaters they used in the old Roman Baths, so it would fit traditionally, and it potentially could even take advantage of your house construction as part of it's heating method.
A masonry stove is essentially a very large masonry structure with a tight sealing firebox made of very fire resistant materials. Built into the structure is a very convoluted smoke path, (which can include a stone oven for traditional baking of breads, etc.) designed to pass through most of the structure. It can have ducts bult into it as well, or the heat exchanger for various other heating systems. The basic principle of operation is that you build one or two large HOT fast burning fires a day. The heat from the fires goes through the masonry structure which absorbs and stores the heat while cooling the smoke. The hot masonry structure then sits and radiates the heat out over several hours. This radiant heat is supposed to be very effective and efficient. Masonry stoves are supposed to be very efficient at getting lots of heat out of smaller amounts of wood, and are getting to be very popular up in the Scandinavian countries, as well as Russia. The basic concept actually is supposed to go back as far as the Roman times when it was used to heat their baths. It was rediscovered in medieval times when increasing population in the northern countries caused there to be shortages of firewood, and a search for stoves that would give as much heat as possible from minimal wood.
Downsides are the weight and cost. Since you don't have a basement, you may not have as many concerns about the weight since you would need much less in the way of a footing (which would lower the cost) and since you have no existing structure and are having to build everything from scratch, there might not be as much cost difference. There are several places in the EU that are building the parts for these stoves, in fact just about all the places in the U.S. that are selling them are either using EU parts, or are being run by EU immigrants and/or trained builders, or have EU designs that they are working from. Since your house is basically masonry construction, it might even be possible to incorporate the house structure into the heater, so that you wouldn't need any ducting, etc...
This might be a totally crazy idea, but it might be worth looking into...
Gooserider
One downside about your construction however, is that I think many of us have been assuming that you had a fairly typical American level of insulation, as opposed to what you are describing as basically non-insulated...
This means that you might need a MUCH bigger stove than we would to heat the same amount since you don't have any insulation. A stove like what you are looking at might help, but not let you reach quite the levels of comfort you want when it gets down to your lower temperatures.
However, this is still speculation on my part, and your dealer probably has more knowledge about what is appropriate for your conditions. I would try to talk to any other people you can that are trying to heat similar size spaces with that size of stove to see if it actually works for them.
Another option that you might consider, though it might not be practical for you (I'm not sure) is a MASONRY HEATER. In some ways what you describe almost begs for one. A masonry heater is designed to run short hot fires, so it is almost impossible to over fire, and at the same time is less fussy about wood quality, so the pallet wood is potentially much less of an issue. It is actually a modern version of the heaters they used in the old Roman Baths, so it would fit traditionally, and it potentially could even take advantage of your house construction as part of it's heating method.
A masonry stove is essentially a very large masonry structure with a tight sealing firebox made of very fire resistant materials. Built into the structure is a very convoluted smoke path, (which can include a stone oven for traditional baking of breads, etc.) designed to pass through most of the structure. It can have ducts bult into it as well, or the heat exchanger for various other heating systems. The basic principle of operation is that you build one or two large HOT fast burning fires a day. The heat from the fires goes through the masonry structure which absorbs and stores the heat while cooling the smoke. The hot masonry structure then sits and radiates the heat out over several hours. This radiant heat is supposed to be very effective and efficient. Masonry stoves are supposed to be very efficient at getting lots of heat out of smaller amounts of wood, and are getting to be very popular up in the Scandinavian countries, as well as Russia. The basic concept actually is supposed to go back as far as the Roman times when it was used to heat their baths. It was rediscovered in medieval times when increasing population in the northern countries caused there to be shortages of firewood, and a search for stoves that would give as much heat as possible from minimal wood.
Downsides are the weight and cost. Since you don't have a basement, you may not have as many concerns about the weight since you would need much less in the way of a footing (which would lower the cost) and since you have no existing structure and are having to build everything from scratch, there might not be as much cost difference. There are several places in the EU that are building the parts for these stoves, in fact just about all the places in the U.S. that are selling them are either using EU parts, or are being run by EU immigrants and/or trained builders, or have EU designs that they are working from. Since your house is basically masonry construction, it might even be possible to incorporate the house structure into the heater, so that you wouldn't need any ducting, etc...
This might be a totally crazy idea, but it might be worth looking into...
Gooserider