Magnus recently serviced our gas-fired boiler. Never before had I seen such thorough work. He actually removed the burner unit from the furnace in order to clean it and undertook a series of instrument readings to ensure that the flue was operating properly afterward, that all seals were sound, and that carbon monoxide levels were within acceptable limits. His work was far better than previous contactors who charged almost twice as much and whose work did not approach Magnus' standard. Most simply vacuumed the burner quickly while it was in place without doing much else.
To cap it off, "Mags" is a very pleasant person and very trustworthy. I would have no hesitation in recommending him to others. In fact, he was recommended to me from a very highly rated heating contractor who is listed on HomeStars. It doesn't get better than that.