Hot Water System Commissioning

What hot water system commissioning covers

Commissioning is a structured set of checks and adjustments to make sure the system operates safely, meets manufacturer requirements, and performs as expected.

• Visual inspection of the cylinder, pipework, valves and insulation
• Checks for leaks, correct pipe sizing and sound connections
• Verification of temperature and pressure controls
• Testing of key safety devices (for example relief valves and discharge arrangements)
• Confirmation that the system heats up correctly and recovers in a sensible time
• Set-up of controls and guidance on day-to-day operation
• Notes on findings and any remedial work needed to bring the system up to standard

When this service is most useful

Book commissioning if you have had a new cylinder fitted, a major component replaced, or repeated issues you want properly diagnosed.

Typical situations include:

• New hot water cylinder installation (vented or unvented)
• Replacement of immersion heaters, thermostats, valves or controls
• Work on primary pipework, expansion vessels or pressure reducing valves
• Hot water that runs out quickly, fluctuates in temperature, or is excessively hot
• Relief valve discharge, pressure loss, or unexplained noises from the cylinder

How commissioning is delivered

The engineer will first confirm the type of system and its safety requirements, then run through a defined sequence of operational tests. Settings are adjusted to manufacturer specifications where possible, and any non-compliant or unsafe items are clearly explained.

For unvented hot water cylinders, commissioning is carried out by an appropriately qualified engineer and includes specific checks for pressure control and discharge pipework.

What happens after commissioning

You will receive clear feedback on what was tested, what was adjusted, and what to monitor. If any parts are worn, incorrectly fitted, or unsafe, you will be advised on the most practical repair options and the priority of each item to keep the system safe and dependable.