We will in a 3,000 square foot house in Maine and now have access to natural gas. We have spoken to several contractors about boilers and are getting recommendations for a Viessman Vitodens 100, Triangle Tube model and an Energy Kinetics Accel CS. Our old house house had an Energy Kinetics System 2000 that functioned perfectly so I am biased toward that product. After reading quite a lot about the Viessman, I am concerned about the reliability of the machine.
Does anyone have any Experience with these models? I'm especially interested in hearing about the Energy Kinetics Accel CS? To be clear, anything we install would have to be better than 90% AFUE.