Cast iron fireplace + hot air ducts X Russian mass heater (kuznetsov) + hot air ducts

Hi Permies, I'm from the south of Brazil, my name is Samuel. Winter temperatures here average 10 to 12 degrees Celsius, with cold fronts pushing temperatures down to 0 Celsius, sometimes below zero. Nothing exaggerated, but it's a very humid and cold winter because it rains a lot.

I'm planning a new house in a more rural area, just one floor, and I would like to have some form of heating with wood, which would heat the whole house to an acceptable temperature and remove the humidity from the house.
Electricity is quite expensive here, so fully electric systems are only for very rich people. We pay on average 1 real per kWh, in comparison it would be the same as in the US you paying 1 dollar per kWh of electricity.

I thought of two alternatives, which I'm researching and taking into consideration, but for both I would like the opinions and suggestions of those of you who live/know these heating alternatives, because here in the region there are none of the alternatives.

1 - a cast iron fireplace from the Polish brand Kawmet. I can buy them in a nearby city that imports them. It would heat one of the rooms well, but I would like to heat the whole house. To do this, I would build a system of hot air ducts with forced ventilation to the other rooms in the house. Something very similar to a video I saw on YouTube called  "#24 Wood Fireplace Central Heating | At The Ranch".

Basically, you create a heat "box" around the fireplace, which will heat the air well. From this box, you just need to use an exhaust fan to collect this hot air and distribute it through ducts to other rooms. The positive point is that I have a better idea of ​​how it would work, but it is quite expensive. The cost would be around 10000 to 15000 for the fireplace alone, plus the rest of the ducts and exhaust fan, I could imagine another 4000.

2 - The second option that I have been considering recently would be to build one of Kuznetsov's Russian masonry heater projects. I have access to the project on the internet, and apparently it is basically enough to follow the project to the letter, and have iron doors. From what I understand from the projects, I would build a large one, the more bricks the greater the thermal mass. The heat would be radiated into the environment much more slowly, making everything easier, because I imagine that burning it once a day, or every two days, could keep everything warm.

The idea would be to build one of the Kuznetsov designs, but at the top, make a chamber where it could capture and heat the air to distribute it to other areas of the house through forced ventilation.

The question remains: would a Kuznetsov with forced ventilation to other areas work well?
Would it keep the house well heated/dehumidified?
Does anyone have/made/seen a similar system?
What do you think of Kuznetsov stoves?
What do you think of the idea?

Thank you very much

If your real to dollar example is relatively accurate, it sounds like the cast iron stove system would be very expensive. Building a Kuznetsov heater would probably be a much better option. I would plan to locate it in the wall between two major rooms, so that it could heat both at the same time. You would just need to make sure the wall had a masonry section for at least 10-20 cm in each direction from the heater. If  masonry is a typical wall material for your area, there is no issue.

From your climate description, I would say you probably only need a medium sized heater, unless your house is going to be quite large. The more open the floor plan can be, the easier it will be to use a masonry heater.

Kuznetsov gives exact brick-by-brick plans, but there is an alternative which may well give better efficiency: the bell-style rocket mass heater, specifically as developed by Peter van den Berg at batchrocket.eu. The firebox of the batch box needs to be built exactly as specified in that site (various sizes available, with a 6"/150mm diameter system size being most common), but the bell using Kuznetsov's principles can be any shape of simple masonry box you desire as long as the internal surface area corresponds to the system size. These have been scientifically tested to be extremely efficient, easily exceeding strict European standards.