How often should water temperatures be checked in a care home?
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Key points
- Monthly is the baseline for temperature checks in a care home: calorifier flow and return, plus sentinel outlets on every loop.
- Store hot water at ≥60°C, deliver at ≥50°C within 1 minute; many care providers work to the healthcare figure of 55°C because residents are a high-risk group.
- Little-used outlets are flushed weekly, and a care home's little-used list is usually longer than it looks.
- TMVs protect residents from scalding but hold water in the growth range, so they sit on a service schedule from the risk assessment.
- CQC inspections look for records: the log book is the evidence, kept at least five years.
In a care home, water temperatures are checked monthly as the baseline: the calorifier flow and return, and the sentinel outlets on each hot and cold loop, with every other outlet worked through on a rolling programme. Weekly flushing of little-used outlets runs alongside, and shower heads, tanks, calorifiers and thermostatic mixing valves each sit on their own schedule. Because residents are among the highest-risk groups for Legionnaires' disease, the risk assessment often tightens these starting points rather than loosening them.
The care-home frequency table
The table below sets out the typical frequencies for a care home's hot and cold water system, built on HSG274 Part 2 and the duties in our care homes guide. These are starting points: the home's own risk assessment sets the actual schedule, and homes providing nursing or higher-dependency care frequently adopt healthcare-grade figures.
| Task | Typical frequency | Target / what good looks like |
|---|---|---|
| Flush little-used outlets (spare rooms, assisted bathrooms in low use, cleaners' sinks) | Weekly | Run to stable temperature: hot ≥50°C, cold <20°C; record each flush |
| Calorifier flow and return temperatures | Monthly | Flow ≥60°C, return ≥50°C |
| Sentinel outlet temperatures (nearest and furthest on each loop) | Monthly | Hot ≥50°C within 1 minute, often 55°C in practice; cold <20°C within 2 minutes |
| All remaining outlet temperatures | Rolling, all covered over about 12 months | Same targets as sentinels |
| Clean and descale shower heads and hoses | Quarterly, more often if the assessment says so | Dismantled, descaled, disinfected, recorded |
| Cold water storage tank inspection | Six-monthly | Lid and screens sound, no debris, stored water <20°C |
| Calorifier internal inspection or base drain-off | Annually | No significant sludge or corrosion; base temperature checked |
| TMV service, clean, descale and failsafe check | Interval set by the risk assessment, often six-monthly to annual | Delivering safe bathing temperature, failsafe cutting flow on cold failure |
| Review of the whole regime and risk assessment triggers | Annually, and on any change | Records complete, scheme still matches the building |
Typical starting points from HSG274 Part 2. The home's risk assessment and written scheme of control set the actual frequencies.
Why care homes sit at the tighter end
Legionnaires' disease is most dangerous to exactly the people care homes look after: older people, and people with weakened immune systems or underlying illness. That is why the monitoring regime in a care home is rarely the loosest version of the table. It is also why many providers adopt the healthcare delivery figure of 55°C at outlets within a minute, even though HSG274's general figure is 50°C, and why homes with nursing care or augmented care units look to HTM 04-01, the healthcare water guidance, for the shape of their regime. The temperature chart shows both sets of figures side by side.
The scalding balance
Care homes carry the two duties at once: water hot enough to control legionella, and water cool enough not to scald frail skin. The reconciliation is the thermostatic mixing valve, which stores and distributes hot but blends down to a safe bathing temperature at the outlet. That blended water inside the valve sits in the growth range, which is why TMVs have their own service line in the table and why the scalding-versus-legionella balance and TMV servicing matter as much as the temperature round itself.
In a care home the monthly temperature round, the weekly flush list and the TMV service schedule are not paperwork for their own sake. They are the controls standing between a high-risk resident group and a preventable disease, and the records are the only proof they ran.
Free legionella risk assessment template
A structured Word document following the five-step approach in ACOP L8. Covers risk identification, written scheme, monitoring, and records. If it isn't written down, you can't evidence it.
Follows ACoP L8 and HSG274 Part 2. Free. No spam.
Making the schedule stick day to day
The failure mode in care homes is not ignorance, it is drift: a monthly round pushed back by staffing pressure, a flush list that no longer matches which rooms are actually empty. Two habits prevent it. First, keep the little-used list honest, reviewing it whenever room occupancy changes, because a room between residents is a little-used outlet tonight. Second, use named outlets and a single log so any carer, maintenance officer or manager can see what is due. The legionella log book holds the temperature round, the flushing records and the inspection history in one place, the sentinel outlets guide helps you name the monthly points, and the temperature checker settles borderline readings on the spot.
If the home does not yet have a regime that looks like the table, start with the assessment: the risk assessment builder walks through the system and produces the starting point your written scheme then refines. No schedule or log book certifies a home's water as safe. What it does is give you, your manager and a CQC inspector a dated, continuous record that the controls were running.
Free legionella risk assessment template
A structured Word document following the five-step approach in ACOP L8. Covers risk identification, written scheme, monitoring, and records. If it isn't written down, you can't evidence it.
Follows ACoP L8 and HSG274 Part 2. Free. No spam.
Frequently asked questions
How often should water temperatures be checked in a care home?
The standard starting point is monthly: calorifier flow and return, and the sentinel outlets on each hot and cold loop, with all other outlets covered on a rolling programme over about a year. Care homes sit at the higher-risk end, so the risk assessment often tightens parts of this, and little-used outlets still need flushing weekly regardless. Whatever frequencies the written scheme sets, every reading needs to be recorded in the log book.
What temperature should hot water be in a care home?
Hot water should be stored at 60°C or above and reach at least 50°C at outlets within one minute. Many care providers adopt the healthcare figure of 55°C at outlets because their residents are as vulnerable as hospital patients. Delivery temperatures at baths and showers are then brought down to safe bathing levels by thermostatic mixing valves, which is how the legionella duty and the scalding duty are reconciled.
Do care homes need to flush outlets weekly?
Yes. Any outlet used less than about once a week should be flushed weekly until fresh water reaches it and the temperature stabilises, and in a care home that list is often longer than expected: rooms between residents, seldom-used assisted bathrooms, cleaners' cupboards and staff facilities. Each flush should be recorded. During an outbreak or after a positive sample, the flushing regime may be tightened further on the advice guiding the response.
What does the CQC expect for legionella control in care homes?
The CQC expects providers to manage infection risks from water systems as part of safe care, which in practice means following ACOP L8 and HSG274: a current risk assessment, a written scheme of control, routine monitoring with records, and a named responsible person. Inspectors can and do ask to see the records. A care home that cannot produce its temperature logs and flushing records has no evidence the control happened, whatever the actual state of the system.
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