There are several situations in which the water meter can be replaced free of charge.

As far as I know, there are four kinds of free replacement water meters:

1. The water meter is broken and cannot be used normally.

2. There are problems such as inaccurate measurement and water leakage in the water meter.

3. The water meter has exceeded the specified service life and needs to be replaced with a new one.

4. The contract clearly stipulates that the property is responsible for the maintenance of the equipment and facilities belonging to the public, so the property is responsible for the replacement.

Please note that the specific situation may vary by region and policy. It is suggested that you consult the local water department or property management company for more accurate information.