This mostly concerns what your heating needs are for the room your wood burning stove is going to heat. If you will be using the wood burning stove primarily for heating and not just for pleasure, you can apply the general rule of thumb that a wood burning stove heats 10 m2 per kilowatt. A 7 kW wood burning stove can thus heat up to 70 m2.
It is important to keep in mind where you want to place the wood burning stove and whether you want a free-standing stove or a built-in fireplace insert. The location determines, for instance, whether the wood burning stove requires a top or back outlet to the chimney. At the same time, the floor must be able to tolerate the weight of the wood burning stove, and flammable materials must be kept at a certain safety distance from the wood burning stove. Always check national legislation on the topic.
Always check whether the chimney lives up to the national requirements for connecting wood burning stove and chimney. You should check, for instance that the chimney is air tight and that it draughts correctly. You can have a chimney sweep check whether your chimney is in order.
The wood burning stove's design is mostly about what you like. Round, square, high, low... There are plenty of options, and you should choose the ones that work best for precisely your home. At https://www.rais.com/en/rais-customized, you can see the different handles, colours, height and other options.
All RAIS' wood burning stoves have window cleaning, which means that the heat from the fire flows down over the pane and keeps it free of soot. In addition, you can opt to add the CleverAir function, which is an automatic damper that ensures optimal combustion. That way, you don't have to think about opening and closing the damper yourself – all you have to do is add firewood. If you want a fast and easy way to light a fire, you can opt for a gas fireplace, which can be lit with a simple press of a remote control.