I have used Hanson's Plumbing & Heating many times in the past but I have mixed feelings about them. They are always free within a day or so for an appointment and the technicians are always professional and friendly. However, it took them about 4 years to try and figure out what was wrong with my heater. It ended up that the factory specs needed to be changed. My other heater started doing the same thing so I am going to need to call them soon to get it fixed.