I just got a NG heater and going to be piping it in. I have had a solar heater for a couple of years so most of the pipe already exists. Now i now some of this needs to change for the NG heater. Plus I will be adding a inline chlorinator this year.

I do know that the chlorinator needs to go after the heater.

I guess my main question is should I install a check valve between the heater and chlorinator?

Should I instlall install the quick disconnects on each side of the chlorinator?

Is there anything else I should be aware of?