I've been using Heatspan for the cleaning and service of my boiler for years. When the boiler gave out about 4 years ago, Heatspan installed a new one for me. I now have a service contract with them. The new boiler has worked fine, and the price was competitive.
What I like best about Heatspan is that they show up! If you have an appointment, they come on time. If you have a problem, they come the same day--even if it's a Sunday. The monthly fee for the contract is very reasonable, and it includes cleaning, turn on, and shut off service. The people are pleasant, and they do a great job.