Phoenix Gas Services Unvented Audit Checklist
by Stuart Taylor, from the Community
This unvented audit checklist from Phoenix Gas Services helps assess the safety and compliance of unvented hot water systems. It guides inspectors through appliance identification, control system type (e.g., S Plan, Y Plan), inlet water pressure, PRV setting, expansion vessel type and size, discharge pipework (D1/D2), tundish, and material suitability. The checklist covers thermostat and energy cut-out verification, motorised valve operation, cylinder support and lagging, and hot water temperature checks. It also prompts for preliminary electrical tests, safe isolation, Gas Safe licence verification, documentation review, and clear audit outcomes with corrective actions, sign-offs, and target dates—ideal for housing providers and service contractors.
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