hi. i hv been using grundfos ch2-50pc for 3 yrs and it died last week. given so many positive feedback fr forummers on this brand, i am surprised that it only last 3yrs. So i checked with another friend and found that his oso died aft ard 3yrs. anybody else got such experiences? is it worth buying grundfos at >RM1k for 3 yrs?