I just recently installed this water heater. Upon firing it up, the blower motor immediately began a high pitched "motor" noise. I would expect some noise, but this can be heard through the adjacent walls. You can even hear it through the floor, if you listen for it. My question is basically, "Is this normal?" Has anyone else experienced this type of noise situation? Should I contact the company for a replacement motor? The heater does appear to be functioning quite well, just loudly.