There are several things that you may not understand when it comes to heating a whole house instead of just the room the stove is in.
The stove has to be able to generate enough BTUs to overcome the heat loss of your house (every house is different and more than just insulation is involved in heat loss).
Then you have to get that heat evenly distributed to all rooms in the house (stoves generally have problems in this area due to blower air flow ratings and the need for time for the air to become heated).
Let's talk about heat loss both of your house and of the stove.
First the stove, you have to keep the heat produced by the fire in the stoves heat exchanger long enough to heat the air the room (convection) blower is pushing through the heat exchanger. This requires just the correct combustion air to burn the fuel and no more, it is possible with an incorrect damper setting to send a pile of your heat right up the flue.
Then you have to maintain (as close as practically possible) an ash free combustion side of the heat exchanger (ash is an extremely good insulter and the very last thing you want on either side of the heat exchanger).
Now that the heat is being exchanged you have to have a convection blower that can remove the heat on the room side of the exchanger and disperse it into the rest of the house.
Heat loss in the house is via conduction, radiation, and convection. Conduction heat loss can be slowed down by insulation, convection heat loss by air sealing (but there is a limit), radiation heat loss by reflective films.
Just because you think your house is well insulated doesn't mean its heat loss is low frequently the single biggest heat loss in a house is air infiltration or convection (pressure differences and leaks) based. In essence you are continually heating outside air drawn into the house. This can take place at a rate that surprises people.
Then we come to windows which are very poor insulators and not all that poor at being radiation loss sources.
Take some time and play around with the heat loss calculator on
www.builditsolar.com .