It turned out that for my purposes 1000 W is a lot, but below the pulse mode is turned on, which I also do not need. I wanted to rent, but the Internet helped out. There is a tuning resistor on the board, they can either increase or decrease the power (loss of warranty). It was possible to make a constant heating mode at a power of 600 W. At the same time, the maximum power also dropped to 1600 W.