Hi, we had the pool in operation last summer and used it very often, we live in the Alps. This means that the water almost always cools down to around 10-12 degrees. We always had to switch it on at about 12 o'clock so that we had 38 degrees at about 7 o'clock. The electricity consumption is enormous. Not exactly green 😉 but still an awesome thing. This summer we are trying to help with a "water solar" heater.