I have tried 3 electric hose reels for roof cleaning, and every one of them failed soon.
In fact, hose reels themselves soon fail, when faced with the roof cleaning chemicals.
We eliminated hose reels nearly 5 years ago, and never looked back.
But then, we are roof cleaners, not pressure washers.
We don't pull and reel up our hoses 10 times a day!
Hose Reels restrict flow, unless they have large internal manifolds, and they rob pressure.
Not a big deal with a PW, but it can be a big deal with a low pressure roof cleaning pump.
SH is both a liquid and a Gas, and the fumes are very corrosive. Once these fumes find their way into your electric motor, bye bye electric hose reel.
In a SH delivery system, the LESS connections you have, the better!
Less to fail, less chance of leaks.