I’m waiting for your conclusions with Ifell because I also conducted a lot of tests and only by using an external IR remote control for Tuya and creating scenes in which the temperature of the unit with Ifell turned on is changed with a specific delay, I was able to achieve modulation. The pump has dropped to 250W and runs for 20 minutes, then it accelerates, reaches the set value and turns off. I haven’t managed to get it to work continuously, it always turns off after some time…