Safety Action Notice – SAN2604

This notice highlights the potential for overheating and fire risk associated with electric instant hot water boilers installed across the NHS Wales Estate. Over the past 12 months, three confirmed fire incidents have been reported within NHS Wales, with a further similar incident reported via the Hospital Fire Officers’ network by an NHS England Trust. There have also been three incidents reported within one health board in Scotland. Investigations identified localised overheating around internal electrical components, particularly the power switch and internal wiring, with moisture or steam ingress from defective seals, missing fixings, or deteriorated gaskets considered likely contributing factors. A small number of older units inspected following these incidents showed heat damage to cable insulation and required remedial replacement.

This notice applies to all electric instant hot water boilers, regardless of manufacturer. It aims to ensure NHS organisations take action to inspect, maintain, and manage these units, minimising the risk of electrical overheating and fire, safeguarding patients, staff, and visitors.