OUR ORIGINAL 4 UNITS FAILED AFTER 10 YEARS AND WE PURCHASED ONE REPLACEMENT UNIT TO INSTALL AND CHECK DIFFICULTY OF INSTALLATION AND HOW IT PERFORMED. WE INSTALLED IT OUR SELF VERY EASILY AND IT WORKS JUST LIKE THE OLD ONE~! WE INTEND TO ORDER THE OTHER 3 AND INSTALL THEM~! THANKS FOR STANDING BEHIND YOUR PRODUCT~! 
MEL & LOUISE ESKANOS, COLORADO SPRINGS AND OUR KIDS IN DENVER, ANDY & SANDI SCHWARTZ