Installed water meters backwards cause them to run in reverse and significantly affect the accurate billing of hot and cold water costs. This consequence is often underestimated, as reverse installation is more than just a cosmetic issue.
How can you identify a water meter that runs backwards?
A water meter installed against the intended flow direction runs backward and incorrectly registers consumption. The flow direction is clearly indicated by a directional arrow on the meter housing. Meters running backward often show unusually high readings because the meter counts downward from its maximum value (e.g., 999999).
What measurement errors occur with reverse-running water meters?
The measurement error caused by a reverse-running meter depends on the meter type and installation. The deviation can be minimal, but in other cases it can be significant. The following factors are particularly affected:
- Flow direction towards impellers or turbines in the meter
- Position of dirt filters on the inlet or outlet side
- Changes in flow velocity
These factors affect the measurement accuracy and lead to incorrect consumption values.
Is a water meter that was installed incorrectly still calibrated?
Water meters are only validly calibrated if installed correctly and with the flow direction aligned properly. A meter running backward loses its calibration validity and may not be used in commercial transactions, including billing tenants and homeowners. Correction is carried out by a specialist company who rotates the meter in the correct direction to restore its calibration validity.
When is a consumption estimate necessary instead of a billing statement?
Consumption values from reverse-running meters cannot be billed due to the lack of valid calibration. The Heating Costs Ordinance (§ 9a, paragraph 1) permits an estimated consumption as a legally sound alternative in these cases.
How common are backward runners and what preventative measures are taken?
Reverse-running water meters are rare, as qualified technicians check the functionality and leak-tightness of water meters after installation. If a reverse-running meter does occur, the installation must be corrected immediately to avoid billing errors.
Conclusion
The consequences of reverse-running water meters are serious and can significantly distort water consumption billing. Proper installation and regular inspection are crucial to avoid measurement errors and legal problems.
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