I'm gonna say it: A waterbed is indoors, and it's sealed. This is outdoors, open and water splashes. Your unit is NOT designed to be used outdoors. I hope, at a minimum, it's plugged into a GFCI, and I agree with Ben--do NOT let anyone in the pool while it is plugged in. UNPLUG IT!

A 4'x10' or 2'x20' solar panel will make your INTEX toasty warm--safely! I had a 15' round and with the 4'x10' got it up to hot-tub temps--105 deg!

Carl