LiftMaster 8355 or 8550, which one should I choose? What is the difference between these two garage door openers? LiftMaster 8355 is a Premium Series 1/2 HP AC Belt Drive Garage Door Opener. Compared to model 8355, Liftmaster 8550 has some new features such as battery backup and timer-to-close function. LiftMaster 8355 comes with a lifetime motor and belt, one-year parts warranty. LiftMaster 8550W comes with a lifetime motor and belt, five (5) years on parts and one (1) year on battery warranty.
Liftmaster 8355 Review
liftmaster 8550 Review
Garage Door Opener Comparison Chart
8355 Installation Manual
8550W User's Guide
8550W Installation Manual