SWG and gas heater

[Davenj]

I have a Hayward gas heater with no issues. If you keep your water balanced it won't be a problem.

[mickey4paws]

I agree with Dave. Keep your water balanced and keep a watch on your PH and total alkalinity especially and you should be fine with a copper heat exchanger. I would also recommend having a check valve installed. What that does is when the pump is shut off, no water can back up into the heater.