The answer upstairs is purely wrong. With great power, you will never waste money. If the landlord's motivation is not enough, it is recommended to change the motivation decisively. The power is not enough, and it has been burning, and the heating water temperature has been unable to go up. If you want to save electricity, you can also use the German Hanao electric wall-hung boiler with constant temperature and double frequency conversion model. The power is determined according to the building structure (building, square, factory building), heating circulation system (central heating, floor heating) and use area. If no one comes up, use 24KW and 36KW, unless your building needs more than 250㎡ for heating. I hope it helps you.