Legionella Risk Isn’t in the Supply, It’s in the System
London is currently investigating a cluster of Legionnaires’ disease cases across the north‑west and south‑west of the city. As of 23 March 2026:
- 8 confirmed cases
- Further cases under investigation
- No confirmed source yet, with UKHSA leading the response [gov.uk]
The wider risk remains low, but it highlights a key point.
The Shift
Across Europe, Legionella control is tightening:
- Stricter limits in healthcare settings
- Greater focus on materials and system design
- Clearer intervention thresholds
The focus is no longer just water quality at source, it’s what happens inside the building.
Where Risk Builds
Legionella grows in:
- Hot water systems
- Dead legs
- Low-use outlets
That’s where control measures now sit.
The Reality
Compliance still relies heavily on:
- Manual flushing
- Routine walk‑throughs
- Logged maintenance cycles
On large estates, that’s a significant ongoing burden.
A Smarter Approach
The PTF-22-PDC is a programmable piezo switch for automated hygiene flushing.
Using solid-state (non-mechanical) piezo technology, it’s designed for high reliability in wet environments.
It connects to a solenoid valve and:
- Automatically runs outlets at set intervals to prevent stagnation
- Reduces manual flushing requirements
Key features:
- 24 / 48 / 72-hour flush cycles
- Battery or mains powered
- Compatible with latching and non‑latching valves
- No moving parts, improved durability
- IP69K sealed for washdown environments
Helping reduce workload while supporting consistent compliance. No missed flushes. Piezo-driven control for Legionella risk where it actually occurs.
Bottom line:
Legionella risk is local to building systems and smart, automated control at the outlet level is becoming part of the solution.