Quote Originally Posted by slaghunter View Post
The blower is called a power vent and they are used on LP water heaters. You will not usually find a power vent on a natural gas water heater. Whats the difference?? Good question not sure why they have to be on the LP heaters.
This is a natural gas heater and if I understand correctly it is so you can have the chimney go sideways and exit the house thru a wall instead of the roof.