AQUAIOT - Legionella monitoring

Our Solutions

Legionella monitoring in the UK: automate compliance, remove risk

Manual temperature checks and paper logbooks don’t cut it anymore. To keep people safe and stay aligned with L8, HSG274 Part 2 and (in healthcare) HTM 04-01, estates teams need continuous, auditable Legionella monitoring that proves hot and cold water systems stay in the safe zone—without endless “man-in-a-van” visits. HSE GOV.UK

At AQUAIOT, we deliver a Legionella monitoring system that automates temperature profiles at tanks, loops and sentinel outlets, raises real-time alerts, and keeps tamper-evident records for audits. See the solution: Legionella Monitoring System →

What UK guidance actually expects

The UK’s primary control is temperature: store hot water above 60 °C, distribute hot water at or above 50 °C at outlets (55 °C in healthcare), and keep cold water below 20 °C. Systems should be operated, maintained and monitored to achieve those conditions, with flushing of little-used outlets and records kept. HSE

Under ACOP L8, dutyholders must assess risk, implement controls, monitor performance, keep records, and appoint a responsible person. HSG274 Part 2 provides the technical detail for hot and cold water systems; HTM 04-01 layers healthcare specifics. HSE GOV.UK

The AQUAIOT legionella monitoring stack (built for estates, housing & healthcare)

Wireless temperature sensors (tanks, flow/return loops, calorifiers, sentinel taps, TMV outlets): continuous logs at defined intervals.

Connectivity that works everywhere: LoRaWAN or cellular for plant rooms and basements; Ethernet/Wi-Fi where available.

Smart thresholds & rules: instant alerts if storage, distribution or cold lines drift out of range; escalating notifications to duty rotas.

Audit-ready records: immutable logs with timestamps and user actions; export to CSV/PDF for HSE and internal audits.

Automation options: timed or rule-based flushing, TMV check prompts, and task workflows to remove missed actions.

Open integrations: REST APIs and BMS/CAFM connectors so estates teams see issues in one pane of glass.

Learn more: Legionella Compliance (explainer) →

Why continuous legionella monitoring beats clipboards

Catch issues as they start. Overnight cool-down, weekend stagnation, or seasonal cold-water warming triggers alerts before risk escalates.

Slash site visits. Remote insight replaces routine temperature rounds—cutting OPEX and carbon without compromising compliance.

Prove you’re in control. Clear trend lines and exception reports make audits with L8/HSG274 alignment straightforward. HSE

Improve water safety plans. Real data informs TMV placement, recirculation balancing, insulation fixes and flushing regimes.

Typical deployment patterns (what we install and where)

Calorifiers & hot water storage: sensors on flow/return and vessel pockets to validate ≥60 °C storage and loop balance.

Distribution loops: thermostatic readings at risers and key branches to maintain ≥50 °C at outlets (≥55 °C in healthcare). HSEGoodwater

Cold water storage & down services: sensors on tanks and distal points to keep <20 °C under load. HSE

Sentinel outlets & TMVs: periodic or continuous checks; prompt cleaning/descaling tasks; optional automated flushing.

Who benefits most

Healthcare (HTM 04-01): tighter thresholds, higher risk populations—automation reduces human error and improves response time. GOV.UK

Housing providers & PBSA: manage hundreds of risers/outlets; cut truck rolls while keeping logs audit-ready.

Commercial estates & public buildings: prove control across multi-site portfolios; integrate with BMS and CAFM.

Leisure & hospitality: address low-use outlets and seasonal variation with adaptive monitoring and flushing.

Results that matter

Our clients have reduced routine site visits, automated thousands of temperature checks per week, and improved response times to out-of-range events—while generating compliance records that stand up to scrutiny. Read more on our blog: How to avoid Legionella with smart monitoring and How to prevent Legionella with real-time monitoring.

Scientist, hand and bacteria sample in test tube, person in lab with medical research and healthcar

FAQs: legionella monitoring & compliance

What temperatures should we hold?

As a rule of thumb: ≥60 °C storage, ≥50 °C at outlets (≥55 °C in healthcare), and <20 °C for cold. Continuous monitoring verifies you actually maintain those values in use.

Do we still need manual checks?

You’ll retain key verification tasks (e.g., physical inspections, cleaning/descaling), but automated temperature logs replace most routine thermometer rounds—improving coverage and audit quality.

Is this L8 compliant?

ACOP L8 sets duties (assess, control, monitor, record). Our system supports those duties with continuous data, alerts and audit trails; HSG274 Part 2 provides the technical framework our designs follow.

What about healthcare specifics?

We apply HTM 04-01 where relevant (temperatures, processes, water safety plans) and can align reporting to your governance pack.

Where should sensors go?

Start with calorifiers, loop flow/return, cold storage, key risers/branches, and sentinel taps—then extend to risk outlets, TMVs and known stagnation points.