Was having second thoughts after reading some of the lower rated reviews but so far has been working great holding the temp at 78 with no solar cover outside temps have been low and water temp hasn't changed, very quiet, one thing to note is making sure you have the correct fittings as the heater only comes with hose barbs I had to do a little plumbing to make it all go together with the intex sand filter, for everyone asking yes it has a pressure shut off. Heated our 22x12 pool in 2.5 days with no solar cover