HI All,
I have a 333K Sta-Rite heater installed on my 18x36 IG with spa. The spa is separate and in winter we usually close the pool but leave the spa open (until about Christmas) After that I close it because it gets REALLY cold. Anyway, the manual said not to operate it when temps are below 40f and I'm curious as to why. From September to December it definitely gets below 40f.

Thanks,
J.

I'm wondering if this is the reason my Raypak went south in less than 4 years