Technology House, Stratfield Park, Waterlooville, PO7 7XN 023 9223 3611
Speak to an expert
TMV Temperature Monitoring

Safe to touch.
Safe to drink.
Both, watched.

Thermostatic mixing valves blend hot and cold to stop scalds, which can leave lukewarm water Legionella loves. AQUAIOT monitors TMVs continuously, so scald safety and Legionella control are balanced on the record.

Speak to an Expert See how it works
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

Two safety duties.
One blended
outlet.

A TMV solves one risk and can create another. AQUAIOT gives continuous temperature visibility at and around mixing valves so the trade-off between scald protection and Legionella control is evidenced, not assumed.

Watch the blended outlet, continuous temperature at thermostatic mixing valves, where the blend can sit in the lukewarm Legionella range.
See the hot supply too, readings on the hot feed to the TMV, so you can confirm hot water reaches the valve before it is blended down for safety.
Alerts on either failure, immediate SMS, email, and app notification if the outlet drifts too hot for scald safety or the supply runs too cool for Legionella control.
Request a Consultation
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.

HSE L8 & HSG274 Part 2 Scald Protection Legionella Control Blended Outlet Watch
Book a Demo

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

TMV temperature monitoring, answered

Why do thermostatic mixing valves need temperature monitoring?
A TMV blends hot and cold to deliver water at a safe temperature and prevent scalding, but that blend can sit in the lukewarm range Legionella favours, and the valve itself can become a colonisation point. Monitoring the TMV continuously lets you evidence both that the outlet is safe to touch and that the hot supply behind it stays hot enough to control risk.
How does TMV monitoring balance scald safety and Legionella control?
The two requirements conflict: scald safety wants a cooler outlet, Legionella control wants a hot system. AQUAIOT monitors the blended outlet and the hot feed to the valve continuously, so you can confirm the outlet stays below the scald threshold while the supply stays above the Legionella control threshold. Both are checked against the targets your duty holder sets.
What does AQUAIOT measure at a TMV?
Continuous temperature at the mixing valve outlet and on the hot supply feeding it, profiled around the clock and held with secure timestamps. Trendlines reveal whether the blend drifts and whether hot water is actually reaching the valve, while alerts fire if either side moves out of its configured range.
Are TMVs treated as sentinel points?
They often are. Thermostatic mixing valves are frequently among the representative outlets checked in a water safety regime because they combine scald risk and Legionella risk. AQUAIOT instruments them with continuous sensors so the readings your written scheme relies on at these points are captured automatically rather than monthly.
Can existing TMVs be monitored?
Yes. AQUAIOT sensors are designed for retrofit in live environments with no shutdown required, and our engineers handle the site survey, installation, and commissioning. Existing thermostatic mixing valves and their hot feeds can be instrumented without interrupting supply, then report continuously to one dashboard.
Explore the AQUAIOT range

Related AQUAIOT monitoring solutions

Automated Legionella Monitoring Water Tank Temperature Monitoring Legionella Alarm System Legionella Data Logging Multi-Site Legionella Monitoring Legionella Monitoring for Shopping Centres
Ready when you are

Balance scald safety and Legionella control on the record.

Talk to our engineering team about continuous TMV temperature monitoring across your outlets.

Speak to an Expert Book a Demo 02392 233 611
TMV Temperature Monitoring – Speak to an AQUAIOT engineer about your estate.
Speak to an Expert
Shopping Cart (0 items)

© 2026 AQUAIOT LTD. Registered in England and Wales, company number 16585190. Registered office: Technology House, Units 10-11 Stratfield Park, Elettra Avenue, Waterlooville, Hampshire, PO7 7XN. Privacy policy