How Often Should Water Temperatures Be Checked?

Calorifier flow and return temperatures also have monthly checks in the guidance. Cold-water storage and incoming supply checks need their specified schedule, alongside representative outlet checks. Record those tasks separately rather than treating one outlet measurement as evidence about all stored and distributed water.

A sentinel point represents a relevant part of the system; it is not simply whichever outlet is easiest to reach. Use the schematic and actual distribution arrangement to establish the points and keep their references consistent.

A thermostatic mixing valve blends water to reduce scalding risk. Its mixed outlet temperature does not establish the upstream hot-water distribution temperature. The monitoring method must address the appropriate supply location while preserving the required scald protection.

HSE's hot and cold water guidance explains the temperature-control basis: hot storage at least 60°C, hot distribution reaching 50°C within one minute at outlets, or 55°C in healthcare premises, and cold water maintained below 20°C where possible. These are control-system values, not instructions to deliver scalding water to users or change valve settings without assessment.

Record the system and point reference, date, method, result, relevant timing and person completing the check. Include the expected value and action route so a reading outside the requirement is recognised immediately.

For example, repeated low readings on one return loop should prompt investigation of that part of the system. Re-entering the same result every month does not explain whether circulation, controls or an altered use has been addressed.

Refurbishment, new outlets, altered operating hours and low occupancy can change the programme. Update the monitoring points and tasks when the system changes. Follow the agreed response to a failed result and retain evidence of corrective work and subsequent checks.

No. The programme identifies sentinel and representative points and other system checks. The selection must provide useful coverage of the actual installation.

Only where the monitoring arrangement is properly specified and verified for its purpose. Sensors do not remove inspection, maintenance or action on failures, and their location matters.

Record the reason and arrange the appropriate follow-up. A locked room or inaccessible point should remain an open task rather than being marked satisfactory.

See Water Hygiene and Legionella, TMV Servicing and Testing, the Water Hygiene Checklist and the Knowledge Centre.