Worked for a pool company building maintaining pools. My boss always kept every motor an every heater. Gas ones are the ones with the copper coils in them. They are great. My old boss used to get 100 a year. Heaters go pretty quickly usually mice rip them apart and other stuff. I have 2 laying around that I had ex customers call and ask to be removed. I will always remove it even if it's for free. Some screws off the sides and top and it comes right off saw out coils and ur good to go