I had a New Yorker WC130 recently installed by a professional. It is running in parallel with a New Yorker oil furnace, each on a separate chimney flue. I was happy with its operation during the month of November and the beginning of December, but then the troubles began. It nearly smoked us out of house and home at Christmas time, with smoke coming out of the stove pipe and boiler jacket. After extensive research and trouble shooting, I determined (right or wrong, I'm not sure) that I had a negative draft on the boiler flue. I vented my basement, lit a fire, and watched it like a child for several hours without a smoking problem. Not trusting it overnight, I let it die out. The next day, I checked my chimney and it was plugged solid with creosote. Now remember, I ran this for 6 weeks with no issues at all, and now suddenly all of these problems. I did notice that after 2/3 hours of burn time, I could not keep the stack temp at more than 150-175 degrees. I am at the point of trying to resell and suffer the $$$$ losses. I'm also kicking myself for not biting the bullet and paying for an OWB. Please respond if you have any ideas, questions, etc...