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This is an initial review based on having the heat pump up and running just one day. Heat pump came well packaged and in great condition. Pool water was delivered Jun 8th around noon and the water delivered was 53°F according to thermometer in the pool. We switched on the filter/pump and heat pump around 2:00pm. Nothing happened, but hubby realized we had to hit the reset button on the plug end. We used a heavy duty, outdoor power cord. Based on some reviews, I was concerned that we could have issues when turned on but once we hit the reset button, everything came on fine and setting the desired temperature was easy to do (instruction book is easy to follow). Pool temperature rose slowly over the next few hours, a few degrees per hour. By 7:00pm the temperature showing on the thermometer in the pool, as well as the heat pump, was 62°F. This was an increase of 9°F over 5 hours. The day was pretty warm for early June here, around 20°F. The evening and overnight was cold again and only 10°F this morning around 8:00am so the night was no higher than that and probably cooler. Water temperature on the heat pump this morning was showing still 62°F, so no increase in temperature over night, but this was expected since it was cold last night. Of course, the fact that the water didn't lose temperature overnight was a good sign. Because of our cool nights, even in summer, we'll be running the heat pump constantly. I'm hoping that the heat pump will continue to increase the pool temperature during the day and hold that temperature each night. We have our bubble solar cover on the pool to contain heat and it stays on when we're not in the pool. Heat pump is set about 5 feet from our pool, under our back steps. We have a rubber pad on our steps over the heat pump to protect it somewhat from rain (because we've read comments about rust). Pool is 12' round by 3.77', which is about 3000 gallons. Filter/pump is 1000gal/hour, which is the minimum required for this heat pump. Any less than 1000 and you'll get an error. I'm hoping that over the next few days, temperature will continue to increase. We've set the temperature to 89°F as one comment here suggested to set it 3 degrees higher than desired temperature. Last year, with no heater, just a long 30' black hose, highest temperature was 79°F (not high enough for my liking but I swam anyway). Hoping for 84-86 this year. Will check back here and update in a week or so and may change the number of stars at that point also. June 11: Pool is 80°F. Went from 53 to 80 in just three days with pool cover always on. I am very happy with this heater. June 14/25: Pool hit 87°F today and I jumped in after work. 87 is way too warm so I had to turn the unit down from 89 to 85 (again, someone here recommended setting the unit 3 degrees above what you want but I find my in-pool thermometer reads 2 degrees warming than the heater display). Pool was at 80 this morning but felt warmer. If an 85 setting can keep it to 82-84 during the day that would be perfect. Tweaking as I go to get the right temperature. Again, so incredibly impressed with this heater. Way beyond what I hoped for reading some of these negative comments. Keep in mind, I live in a cool windy part of Nova Scotia, and nights are cool even in the summer so I'm very happy with this purchase.