Kurt E. was the service tech sent out to tune up our furnace and flush our on demand hot water heater. Not only did he explain what he was doing he told me I could watch him do it. I felt like I was in school! I didn't realize how much there was to the process. Kurt was able to bring our furnace from 45% efficient to 89%! We haven't ever had a tune up done (14 years). I was so impressed We signed up for the yearly Johnson Bros Service plan and plan to do that every year. Thanks Kurt and thanks Johnson Bros! I recommend you to everybody!