I have a Hayward H300 heater on my saltwater pool with a Hayward Pro series high rate sand filter. it was installed in 2006 and sat unused for four years. The pool store says I should replace it because I risk turning it on and rust coming out into my new water. (I am replacing the liner and refilling the pool to open it up) I was thinking because it sat unused it would be considered more like a six year old heater. They say because it sat so long that isn't good. Anyone have an opinion? We won't use it often. Should we just get rid of it?
Also is anyone familiar with this heater? Is it a good one? How long should they last?
Thanks in advance.