Property owners with tenants should contact their plumber or plumbing contractor for advice.
Prepaid sub-meters are available from most plumbing wholesalers and hardware stores. Ensure that the meter you buy is SABS certified and STS compliant.
If the property has been wired correctly, with each section on its own circuit, installing a sub-meter is relatively straightforward and, as they have a wiring diagram packed in the box.
Metro Prepaid Support