Yes, hot water is a legal requirement in the workplace in the UK.
Every employer must provide washing facilities with clean hot and cold, or warm, water, and that water must be running wherever it is practicable. A basin with only a cold tap does not meet the standard.
The law goes further than a hot tap, though. Water temperatures must be managed to control legionella, some outlets need scald protection and any refurbishment must meet the Building Regulations.
Furthermore, beyond providing hot water for employees, the considerations also need to include any customer facing facilities provided in your washroom.
This guide from Inspired Washrooms covers what the law says, how it applies in different settings and how to keep a commercial washroom compliant.
What the Law Says About Hot Water at Work
The legal requirement comes from Regulation 21 of the Workplace (Health, Safety and Welfare) Regulations 1992, often called the workplace welfare regulations. They apply to almost every workplace in England, Scotland and Wales, and Northern Ireland has equivalent rules.
Regulation 21 says washing facilities are only suitable if they:
- Are in the immediate vicinity of every toilet and near any changing rooms
- Have clean hot and cold, or warm, water, running so far as is practicable
- Include soap and towels or another means of drying
- Are ventilated, lit and kept clean
- Are separate for men and women, unless each is a lockable room for one person
So, does a workplace have to provide hot water? Yes. It is a direct legal duty, not best practice. HSE explains how to meet it in its Approved Code of Practice, L24, which also sets minimum numbers of toilets and washbasins for your headcount.
Hot and Cold or Warm Water: What Counts?
Either separate hot and cold supplies or a single warm supply is acceptable. Warm water delivered through thermostatic mixing valves (TMVs), thermostatic mixer taps or point-of-use heaters is often the most practical option, as it arrives at a safe, comfortable temperature. A bowl filled from a kettle would not meet the standard in a permanent building.
Where Hot Water for Handwashing Is Required
The rules depend on the setting. Most premises fall under Regulation 21, but some sectors add requirements of their own.
Offices, Warehouses and Factories
Staff washrooms fall squarely under Regulation 21. In large buildings the challenge is distance, as basins far from the boiler can take minutes to run warm. Good washroom design for warehouses keeps pipe runs short, and point-of-use heaters can serve remote washrooms.
Construction Sites
Schedule 2 of the CDM Regulations 2015 requires clean hot and cold, or warm, water beside every site toilet, usually through welfare units with heated tanks. Once the building is handed over, the permanent washroom fit out must meet Regulation 21 and Part G.
Restaurants, Cafés, Pubs and Food Businesses
Food hygiene law requires every washbasin designated for cleaning hands to have hot and cold running water, and toilets must not open directly into food rooms. Inspired Washrooms designs restaurant toilets and pub toilets with warm water at every basin and customer facilities kept apart from food areas.
Hotels, Leisure Centres and Changing Rooms
Regulation 21 also requires washing facilities near changing rooms, and showers bring a higher scald risk. Thermostatic showers and mixer taps suit leisure centre washroom refurbishment and hotel bathrooms, delivering water stored hot enough to control legionella at a comfortable temperature.
Schools, Care Homes and Healthcare
Young children, older people and patients may not react quickly to hot water, so scald protection matters as much as supply. Hospital washrooms and care settings need TMVs close to outlets and easy to reach for servicing.
Public Toilets and Transport Hubs
There is no general law requiring public toilets, but where they are built or refurbished, Part G requires heated water at basins in or next to a toilet. Sensor taps with preset temperatures suit airport washroom refurbishment and campsite toilets, where controls need to resist tampering.
What Is the Legal Temperature for Hot Water in the UK?
There is no single legal temperature in the welfare regulations. However, employers have a separate duty under the Health and Safety at Work etc. Act 1974 and COSHH to control legionella, which multiplies between roughly 20°C and 45°C.
L8 Legionella and HSG274
HSE's Approved Code of Practice, L8, and its technical guidance, HSG274, set out how to manage hot and cold water systems. HSE's hot and cold water systems checklist gives these legionella hot water temperature targets:
- Stored hot water: at least 60°C, checked monthly
- Hot water at sentinel outlets: at least 50°C within one minute, checked monthly
- Cold water at sentinel outlets: below 20°C within two minutes, checked monthly
Good legionella management also relies on short insulated pipe runs, no dead legs, weekly flushing of little-used outlets and records of every check.
TMV Regulations in the UK and Hot Water Temperature in Care Homes
There is no single TMV regulation for every workplace. TMVs are the standard way to store water hot enough to control legionella while delivering it safely at the tap, and your risk assessment decides where they are needed.
HSE guidance on scalding and burning says bath and shower water must not exceed 44°C where vulnerable people are at risk, with NHS settings working to 41°C for showers. Washbasins used by vulnerable people should also have outlet controls, and TMV3 approved valves are the usual specification in healthcare.
Approved Document G and Washroom Refurbishments
In England, any new or refurbished washroom must meet Part G of the Building Regulations, explained in Approved Document G. G3(1) requires heated wholesome water at any washbasin in or next to a room containing a toilet, and G3(2) and G3(3) require hot water systems to be designed and installed safely. Wales and Scotland have similar rules.
No Hot Water at Work: What the Law Says
If the hot water fails, the employer must fix it as quickly as reasonably possible and put interim measures in place, such as temporary water heaters or portable handwash units. Hand sanitiser can help in the short term but does not replace handwashing.
The no water at work law in the UK is stricter. With no running water at all, toilets cannot flush and handwashing is impossible, so facilities usually need to close until welfare units arrive or supply returns. Staff with ongoing concerns should raise them with their employer first, then with HSE or the local council.
How Inspired Washrooms Builds in Compliance
Most hot water problems are designed in: basins too far from the supply, long dead legs, hidden valves or the wrong taps. Inspired Washrooms plans for every requirement at the design stage:
- Regulation 21: a bespoke washroom design checks basin numbers against headcount and places a basin beside every WC
- Warm water at every basin: a commercial washroom refurbishment can add point-of-use heaters, thermostatic taps or sensor taps
- Legionella control: redundant pipework and dead legs are removed, with short insulated runs and TMVs close to outlets
- Access for testing: pre-plumbed IPS units give maintenance teams quick access to valves and TMVs behind removable panels
- Low-use washrooms: sensor taps with hygiene flush keep water moving in school toilets over the holidays
- Handover: whether it is an office toilet refurbishment or a full fit out, outlet temperatures can be checked before handover to start your legionella log
Workplace Hot Water FAQs
Still have questions about the requirements for hot water in the workplace or even in customer facing environments? As washroom installers, we’re here to answer your questions. Please contact us directly if you’re interested in a commercial project and don’t see your query below.
Is hot water a legal requirement?
In the workplace, yes. Regulation 21 requires washing facilities with clean hot and cold, or warm, running water wherever practicable.
Do restaurants and cafés need hot water for handwashing?
Yes. Food hygiene law requires every washbasin designated for cleaning hands to have hot and cold running water, plus soap and a hygienic way to dry hands. The same applies in kitchens, cafés and takeaways, and staff toilets must not open directly into rooms where food is handled. Market stalls and food vans have a lighter test but must still provide facilities for hygienic handwashing.
Can a workplace be open without hot water?
A short outage does not automatically mean closing, provided the employer acts quickly and provides interim facilities until hot water is restored.
Can I refuse to work if there is no hot water?
It is rarely treated as a serious and imminent danger. Raise it with your employer or safety representative first and seek advice from ACAS before refusing.
Can I go home if there is no water at work?
Employers usually need to provide temporary facilities or send staff home or to another site. Whether you are paid depends on your contract.
Is it illegal to not have hot water for 4 days?
The law sets no fixed limit, but four days with no interim arrangements would be hard to justify.
What is the legal temperature for hot water in the UK?
There is no single legal figure. HSG274 expects stored hot water at 60°C and at least 50°C at outlets within one minute, with a 44°C maximum for bathing where vulnerable people are at risk.
Make Sure Your Washroom Meets the Law
If your washroom has slow-to-heat taps, inaccessible valves or an outdated layout, a refurbishment is the most effective way to fix all three.
Inspired Washrooms designs and installs compliant commercial washrooms across the UK. Contact the team or call 0115 811 4242 for free, no obligation advice.