If (heaven forbid) your heater conks out this winter, I highly recommend Sullivan Super Service. When it was clear that we needed to replace ours, a salesman came to our chilly old house ASAP--even though it was late on a Saturday night. He also loaned us some space heaters to tide us over until the installation. Friendly, efficient staff--very tidy and thorough (they're an old, locally based company). We couldn't be happier with our spiffy new heater. They also do plumbing and AC. 412-200-5630, http://www.sullivanservice.com/