Do you need to put water charges when discharging water from property boilers?

The water discharged by heating is not counted as water fee, because the heating water cannot be controlled without passing through the water meter, but the heating water cannot be discharged casually unless there are special circumstances.

For example, there is air in the heating pipe. In order to release air and ensure normal heating, water can be released. If there is too much heating water, the water level in the boiler will drop. In order to ensure that the boiler will not burn out, it will continue to add water, which will waste water and cannot be heated, so there is nothing that cannot be heated.