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HSG274 Part 2 Monitoring

The monthly round.
Now always on.
Every outlet.

HSG274 Part 2 sets out the temperature checks for hot and cold water systems, from monthly sentinel outlets to a yearly programme. AQUAIOT runs those checks continuously, so the round no longer depends on someone with a probe and a full diary.

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Live monitoring. Continuous compliance.
AQUAIOT L8 Dashboard
42Outlets OK
3Caution
1Alert
Sentinel Outlets – Live
Tank A – Cold Feed18.4°COK
Outlet 7 – HWS Return49.1°CCaution
Outlet 12 – Sentinel56.8°CAlert
CW Tank B17.2°COK
Man-in-a-van visits leave gapsInspection sheets capture one moment. Between rounds, temperatures drift unseen, and your compliance record has no answer for it.
Legionella thrives between 20C and 45CRisk conditions develop and resolve between visits. Manual schedules cannot catch what happens overnight.
Audit prep should not take daysWhen an inspector asks for records, paper logbooks take days to compile. A digital audit trail is instant.
Every missed flush is a duty-of-care gapOne undocumented flushing event is a defensible record waiting to fail under legal scrutiny.
The AQUAIOT Solution

The checks
Part 2 asks for.
Done continuously.

HSG274 Part 2 details the temperature monitoring for hot and cold water systems: sentinel outlets monthly, a rolling programme of others, tanks and calorifiers on schedule. AQUAIOT automates those checks, so the schedule is met without the labour of walking it.

Sentinel outlets, always read, continuous temperature at the representative hot and cold sentinel outlets Part 2 asks you to check monthly, captured every hour instead.
Tanks and calorifiers on watch, cold water storage below the threshold and calorifier flow and return profiled continuously, not sampled on the calendar.
Less labour, more coverage, the monitoring runs itself, freeing engineers from clipboard rounds while covering far more points than a monthly walk can reach.
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Live Outlet Status
CW Tank – Return Temp16.8°C
HWS Flow – Calorifier60.4°C
HWS Return – Loop 349.3°C
Sentinel Outlet 1256.8°C
Alert triggered – Outlet 12
Temperature above L8 calorifier threshold. Notification sent 14:32.
How It Works

Three steps to continuous L8 compliance

Step 01

Monitor

AQUAIOT sensors are deployed at tanks, loops, calorifiers, and sentinel outlets. Temperature is profiled continuously, every reading timestamped and logged to the cloud over secure cellular or LoRaWAN telemetry.

Step 02

Alert

When temperatures drift outside HSE L8 thresholds, or when a scheduled flush is missed, AQUAIOT triggers an immediate alert via SMS, email, or app, with role-based escalation rules for your estates team.

Step 03

Record

Every reading, alert, and action is captured in tamper-evident audit logs. Records are exportable on demand and integrate with CAFM, BMS, and AIMS systems, so audit preparation is minutes, not days.

Capabilities

Everything your L8 programme needs

Purpose-built for estates, facilities, and compliance teams managing water systems across single or multiple sites.

Real-time temperature profiling

Continuous monitoring at tanks, calorifiers, loops, and sentinel outlets. Every reading timestamped and stored, never a gap in your record.

HSE L8 threshold alerting

Thresholds checked against HSE L8 and ACoP guidance. Alerts fired immediately when cold water exceeds 20C or hot water falls below 50C at point of use.

Missed-flush detection

AQUAIOT detects when scheduled flushing routines are not completed and generates an automatic alert, so no event is undocumented.

Tamper-evident audit trails

Every reading and action is logged with a secure, unalterable timestamp. Exportable records ready for audit, inspection, or HSE enquiry at any time.

API / BMS / CAFM integration

Open and interoperable. AQUAIOT connects to your existing SCADA, AIMS, CAFM, and BMS platforms via RS485/Modbus or REST API, no lock-in.

Retrofit-friendly deployment

Non-invasive sensors designed for live environments. No pipe cutting, no shutdown. AQUAIOT engineers handle site survey, installation, and commissioning.

Compliance & Standards

Aligned to the standards your auditors check.

HSG274 Part 2 Sentinel Outlets Monthly Checks Automated Less Manual Labour
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No commitment. Talk to our engineering team.

Who It’s For

Built for the teams responsible

Housing Providers

Protect tenants. Prove compliance.

Housing associations and registered providers carry a statutory duty of care over water systems in their properties. Manual L8 management across multiple sites is operationally fragile, and increasingly under scrutiny.

  • Continuous monitoring across all properties, single dashboard view
  • Automatic alerts when vacant properties develop risk conditions
  • Audit-ready records for insurance, regulatory, and legal purposes
  • CAFM and property management system integration
NHS & Public Sector

Clinical-grade water safety. Without the admin burden.

NHS Estates and public sector facilities operate under HTM 04-01 and HSE L8 obligations. The complexity of large estates, multiple buildings, and dense pipework makes manual monitoring inadequate at scale.

  • Dense outlet coverage across clinical environments
  • Real-time temperature monitoring at thermostatic mixing valves and outlets
  • Integration with existing BMS and CAFM infrastructure
  • Automated compliance records compatible with HTM 04-01 requirements
Facilities & Estates

Less time on rounds. More time on management.

Commercial estates, universities, leisure facilities, and large offices face the same challenge: manual L8 inspection rounds are resource-intensive and provide only a snapshot. Automation changes that calculus entirely.

  • Replace labour-intensive manual rounds with automated monitoring
  • Role-based dashboard access for estates managers, deputies, and contractors
  • Reduce reactive call-outs, detect issues before they escalate
  • On-demand compliance reports for building managers and insurers
Defence & Secure Sites

Secure by design. Compliant by default.

Defence estates, MoD sites, and government facilities carry the same L8 duty of care as any other property, often across aging, complex pipework that is hard to reach and harder to document. Manual rounds leave gaps AQUAIOT closes permanently.

  • Encrypted telemetry, cellular and LoRaWAN with secure payload transmission
  • Tamper-evident immutable logs with timestamps and user actions
  • Role-based dashboard access, right records to the right people
  • Auditable compliance records meeting MoD and government estate requirements
Open, interoperable systems. No lock-in. Engineered for operational environments.
Cellular + LoRaWAN telemetry Encrypted payloads & OTA updates RS485/Modbus + REST API Role-based cloud dashboards CAFM / BMS compatible
Questions & Answers

HSG274 Part 2 monitoring, answered

What does HSG274 Part 2 cover?
HSG274 Part 2 is the HSE technical guidance on controlling Legionella in hot and cold water systems, the type found in most buildings. It sets out the temperature regime: keeping hot water hot, cold water cold, and checking representative sentinel outlets, tanks, and calorifiers on a defined schedule. It accompanies the Approved Code of Practice L8 and explains how to control the risk in practice.
What temperature checks does Part 2 describe?
Part 2 sets out monthly checks at sentinel outlets, with hot water reaching temperature quickly and cold staying below 20C, plus a rolling programme covering other outlets across the year, calorifier flow and return checks, and cold water storage tank temperatures. AQUAIOT captures all of these continuously rather than as periodic spot readings, so the schedule is met automatically and densely.
How does continuous monitoring replace the monthly round?
The monthly round is a person visiting each sentinel outlet with a probe and logging the reading. AQUAIOT fits fixed sensors at those points that report every hour, so the temperature record is far denser than a monthly check and needs no one to walk it. The labour moves from collecting routine readings to acting on the few that need attention.
What are sentinel outlets?
Sentinel outlets are the representative taps chosen to reflect the condition of a water system, typically the outlet nearest to and furthest from each hot water source, and equivalent points on the cold. HSG274 Part 2 asks for these to be checked monthly. AQUAIOT instruments them with continuous sensors, so the sentinel readings your scheme relies on are captured automatically, without relying on a manual round.
Does this reduce the burden on our team?
Yes. Manual temperature rounds are hours of skilled labour every month, and the checks most likely to slip are the ones on a busy week. AQUAIOT runs the monitoring continuously and automatically across far more points than a round can reach, so your team spends time on the readings that need action rather than on collecting routine numbers by hand.
Does Part 2 monitoring support compliance?
It supports it. Continuous readings mapped to the checks HSG274 Part 2 describes give stronger evidence than periodic spot readings, and every reading is tamper-evident and exportable for your written scheme of control. Responsibility for the regime remains with your duty holder under ACoP L8; AQUAIOT makes the monitoring and recording that Part 2 expects automatic and complete.
Explore the AQUAIOT range

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Ready when you are

Automate the checks Part 2 asks for.

Talk to our engineering team about continuous temperature monitoring mapped to the HSG274 Part 2 regime for your hot and cold water systems.

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HSG274 Part 2 Monitoring – Speak to an AQUAIOT engineer about your estate.
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