zt 231 fb water heater by pass

[4335243n]

Does anyone know off the top if the zt 231 fb has a water heater by pass already installed or do i need to have one put in. I am just beginning the process to winterize my trailer for the winter and not sure what method that i should use. Blowing the lines with air or pumping anti freeze through the system

thanks

[Russb]

I always did both, air first then antifreeze.

[ewbldavis]

What year is trailer?

Should be installed, you just have to find access and turn valves.

I also do both - blow them out and use antifreeze.