Just thought that I would share some photos pertaining to the Coachmen Catalina Deluxe when it comes to the water heater and water pump.
For the Water Heater tank it is located under your bottom bunk through the cargo door area. You will have to remove the access panel to get to the tank. With this model the tank already has the bypass installed for winterizing.
For your Water Pump this is located under the Kitchen sink. You will have to remove the bottom access panel to get to it. In this model you should already have a bypass kit installed on your pump as well for ease of winterizing the plumbing system.