My Waterfurace Premier model is @ 9 years old and has been running fine. I notice that my single loop pump, a Grundfos Geolink UP 26-116F, seems to run hot to the touch. I recall that the casing always tended to warm up especially when the pump runs for some time but it just seems hotter than in the past. Do these pumps tend to run hotter as the age? Is this normal?