If water is uncontrolled or approaching electrical equipment, prioritise safety and call a plumber. The guidance below is general and does not replace an inspection.

Understanding the issue

An overflow can indicate a filling-control fault or another issue affecting water level. It should not be capped to hide the symptom. The tank arrangement and safe access need assessing before a repair is attempted.

Before arranging the visit

Explain when the overflow runs and whether the tank is in a difficult loft space.

Choosing the appropriate plumbing visit

We check the visible fault, isolation, pipe condition and access before agreeing the repair scope. Our water storage tanks page explains the related work and how an assessment is arranged.

Where the findings point to cold water storage tank installation, read the cold water storage tank installation service details before discussing the repair scope. The actual fitting and access determine the work needed.

Information worth keeping

Record when the issue occurs, the affected room and any previous repair. For a property in our home area, plumbing in West Bridgford explains the local enquiry route; check the coverage directory for another postcode.

Connected questions

For a related question about water storage tanks, the guide Cold-water storage tank replacement planning explains what to record next.

For a related question about water storage tanks, the guide Changes in water quality from a storage tank explains what to record next.