Thermostatic Mixing Valve (TMV) Servicing & Maintenance
Professional inspection, servicing, and testing of Thermostatic Mixing Valves to control scald risk while supporting Legionella temperature management.
What a TMV Is and Why It Matters
A Thermostatic Mixing Valve (TMV) is a safety device designed to blend hot and cold water to deliver water at a controlled outlet temperature.
TMVs are commonly installed in environments where users may be vulnerable to scalding, such as healthcare, education, hospitality, and residential settings.
While TMVs reduce scald risk, they also introduce an additional control point within the water system. If not maintained correctly, they can restrict temperatures, fail mechanically, or become a source of poor performance.
TMV servicing ensures the valve continues to operate as intended, safely, reliably, and in line with guidance.
The Balance Between Scald Risk and Legionella Control
Effective water safety requires balancing two competing risks:
Hot water temperatures must be high enough to control Legionella bacteria
Outlet temperatures must be controlled to prevent scalding
TMVs sit directly at this intersection.
Without regular inspection and servicing:
Valves can drift out of tolerance
Temperatures may fall outside recommended limits
Systems may no longer meet guidance or risk assessment assumptions
TMV servicing supports both scald prevention and Legionella control when applied correctly.
Where TMV Servicing Is Typically Required
TMV servicing is commonly required in:
Healthcare and care environments
Education facilities
Hotels, leisure centres, and gyms
Residential blocks, HMOs, and social housing
Commercial buildings with mixed-use outlets
Any setting where TMVs are relied upon as a control measure should include them within a planned maintenance programme.
Our TMV Services
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TMV Inspection & Servicing
Routine inspection and servicing to ensure correct operation and temperature control.
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Temperature Testing & Performance Checks
Verification that hot, cold, and blended temperatures remain within acceptable ranges.
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TMV Fault Identification & Rectification
Identification of failed, seized, or poorly performing valves, with practical advice on corrective action.
A Controlled, Repeatable Method
Review of Risk Assessment & Outlet Use
We confirm why TMVs are installed and how they are intended to control risk.
Servicing or Adjustment
Valves are serviced or adjusted in line with manufacturer guidance.
Temperature & Performance Testing
Hot, cold, and blended outlet temperatures are measured and recorded.
Visual Inspection & Valve Condition Check
Valves are inspected for signs of wear, scaling, or mechanical failure.
Recording & Reporting
Findings and results are documented clearly for compliance records.
Common TMV Issues Identified During Servicing
TMV servicing often identifies issues such as:
Inaccurate blended outlet temperatures
Restricted hot water flow
Valve seizure due to scale or debris
Inconsistent performance between outlets
TMVs no longer suitable for their location or use
Early identification reduces the risk of failure and unnecessary system disruption.
How to Arrange TMV Servicing
Initial Enquiry
Contact us to discuss your site and TMV requirements.
1
Scope Confirmation
We confirm the number of valves, locations, and testing frequency.
2
Scheduled Site Attendance
A qualified engineer attends site to carry out servicing and testing.
3
Reporting & Record Delivery
Clear records are issued for your compliance files.
4
Alignment With Guidance and Best Practice
TMV servicing is carried out in alignment with relevant UK guidance, including:
HSG 274
ACoP L8
HTM 04-01 (where applicable)
We apply guidance proportionately, focusing on risk control rather than unnecessary intervention.
Who This Service Is For
TMV services are commonly used by:
Facilities and estates managers
Health & safety managers
Property and block managers
Landlords and housing providers
Duty holders responsible for water safety
The service supports both user safety and compliance assurance.