Yes, there are solar panels on the roof feeding down there to the grey gas heater. I didn't notice a gas line, but there maybe one there.
Ok, I do apreciate you peoples help and will go do some searching on those components. I don't have the name of the pool builders yet, who may have those exact items and instruction manuals.
I would recommend this site have a small list of terms, so newbies like me know what you mean. Like I recognize DE as the earth stuff, but some other shorts I don't. Thank you & I will be around.