OK...I have read alotofthe older forums but I have not found all the up to dat information that I was looking for. I have an Uncle that lives in Derry, New Hampshire and he is tired of paying the oil man. He has considered adding a pellet insert and a new cat woodstove to supplement his oil. I suggested he just a good pellet boiler to cut his costs and use his hot water system. He currently uses an old oil boiler that tests at about 80% efficient. The current oil boiler that he has is 140KBTU and his home is about 2500SQFT. He is concerned about getting such units serviced and little maintenance and ease of use is important to him. He also currently supplements heat with an older wood stove in his kitchen/living room. What are your suggestions as well as well as practical costs that he should expect. I am trying to research and contact people about the following boilers. Which am I missing? Varmebaronen PelletMax UB, MESys, Windhanger, Harmon PB105, Viadrus.