Hello apparently I have upset you with some of my comments and that was not my intent, your correct the op was asking about wood stoves I simply implied food for thought to consider an alternative and I didn't suggest a pellet stove I suggested a Rocket Stove it just happens to burn pellets but is in no way a pellet stove in fact it was tested as a wood stove not a pellet stove. Again your correct with obtaining a good moisture content by properly seasoning your wood is easily obtainable, but real world reality is many don't properly season their wood for various reasons, many are sold wood stating it was seasoned and find it wasn't many have to try and find wood in the middle of the heating season and fail, this leads to many issues including excessive creosote build up hard to start fires smoking back into the house complaints about the stove, and in many cases a house fire. Everyone should be educated to how to properly season their wood and the necessity to purchase a moisture meter to make sure their wood is properly seasoned. I am aware that Blaze King is an exceptional wood stove I sold them for years and installed hundreds of them over the years and their large firebox gives them the ability to hold a fire up to 24 hours and beyond but holding a fire and actually heating the area their capable of or designed to for that length of time drops dramatically, they make it convenient for holding a fire or coals for those extended burn times and save having to start from scratch building a new fire. But those long low burns do add to more creosote build up and should be watched and addressed by burning hotter fires after those long low burn periods to compensate. I respectively have to disagree with your statement that a properly installed wood stove wont smoke, all wood stoves will smoke from time to time for a number of reasons, at start up or when ever the door is opened if operating or burning. Cold flue at start up, wind conditions, improper loading of fuel, not enough kindling when starting, opening the door to quickly, are just a few of the reasons wood stoves will smoke. Most all stoves actually have to leave the door ajar when starting just to help them get started and this is a major factor for stoves smoking back into the room because they are so heavily baffled. Some companies have a built in a by pass to alleviate the need to leave the door ajar at start up. Your question on why 51% efficiency isn't bad thing and your right 51% efficiency isn't great it looks bad but the reality is those efficiency are flue gas temperatures being measured not heat output of the stove. Stoves are tested to a high burn 1 hr. a medium burn on two hrs. and a low burn on 4hrs which simply has to keep running for that 4hr. period and then given a overall efficiency rating. The main requirement of test is the stove has to burn 50% or less fuel between the high burn and the low burn or it fails and still meet EPA 's 2.0 standard. This stove overall emission's were .64, lower overall stove efficiencies can relate to lower pollution percentages because of the higher stack temperatures, the real trick is to lower stack temperature's while maintaining high burner temperatures. My reasoning for a lighter stove is better, isn't just a weight factor but the material used, heat transfer is far faster through thinner metals than thicker metals, do you remember the sheep herder stove's years ago they were 28 gauche blue metal and just lighting a couple sheets of newspaper inside could burn you if you touched the stove after lighting . All woodstoves these days are 1/4" steel, cast iron and even thicker, using soapstone is thicker yet, then the stoves are insulted with brick or cement panels inside to protect them from warping, or cracking, baffles above the fire and under the stove top are insulated with a ceramic blanket all of this is designed to keep the firebox hotter to burn the gasses more completely before they exit the stove at the same time it lowers flue gas temperatures and improves efficiency on burning of the fuel. But the ability of the stove to transfer the heat into the room is lowered because of the insulation factors slowing down the heat transfer into the room, there fore reaching higher efficiency's measured in the stack or the exhaust doesn't relate to more heat out put, if the heat transfer is lowered. No test is done to see how much heat is transferred into the room or which stoves do a better job at heat transfer, common sense will show the thinner the metal the faster the heat transfers through it, that's my reasoning for a thinner stove being a better heater than a heavier stove, I have been a chimney sweep and installer for over 45 years and sold every type of stove made have heard all the praise and complaints from customers on all of them some justified and most not. That old adage about the customer is always right couldn't be farther from the truth but you learn to make them think they are and still solve the problem for them. I have had an obtained every certification in the hearth industry they have offered at one time or another. Just so you know I am not a advocate of pellet over wood or any other heating appliance they all have their advantages and disadvantages depending on the customers needs, the trick is to figure out what they really are looking for, show them what's available and let them decide but broadening their understanding to what's available is always welcomed or that's been my experience. Last note this GAP 2020 isn't a wood stove and it isn't a pellet stove its a Rocket Stove and because of it there will be many more existing manufacturers that will be striving to create their own Rocket Stove model this just happens to be the first Rocket Stove to meet or pass EPA's test requirements. My understanding of a Rocket Stove is there is no air control and this stove has none, this stove has figured out how to control the fuel to achieve compliance. Didn't mean to right a book here but hope it answers your questions to me.