I have found a used Hayward H 350(?) that the owner is asking 600 for. Its older but looks to be in good shape. See pic
It is currently on propane but I would like to switch it to natural gas. Complet newbie at the heater thing so could use some help.
Do you think it's worth it? My pool is quite small and it would be used sparingly in conjunction with solar.
Any advice would be appreciated.