Will a heater for a spa work for a pool?

[Crispyc21]

I've been keeping an eye on the auction site for a good deal on a used heater (electric) for my pool. I found a good deal for a spa/pool heater. When I looked up the model number on the internet to do some research, it’s only listed as a spa heater. Can this be used on a pool? The listing clearly stated they used it in their pool. I’m only looking for something that will heat my pool (5-10degrees) for a month or so at the beginning of the season and a month or so at the end. I have a solar cover that is on all the time so I don’t think I need anything super powerful.
I’ve looked at solar heat but have no place to put the panels (on ground or roof).