Can this heater be used for a koi pond? Does it have copper pipes? Or is it titanium?

This unit doesn't come with pipes. This products heat exchanger is titanium and casing is ABS. As for the Koi Pond, Yes they can be used, however they would require pre-filtration so weeds etc won't get caught in the impeller. If you have any further question, please give us a call, thanks!