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Posted By James Larkin
I am aware that water temperatures need to be at a level to avoid such things as legionella but also no so hot as to cause burn related injuries at the point of use within toilet facilities and kitchen areas.. Can any body advise where I may find the appropriate guidance or ACoP?
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Posted By Paul Timms
Try "The Control of legionella bacteria in water systems (L8)"
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Posted By Ronofcam
L8 ACOP recommends that hot water should be stored at 60°C and distributed so that it reaches a temperature of 50°C within one minute at outlets.
If the temperature falls below that then you need to investigate the reason and rectify. Legionella proliferates at between 20°C and 45°C.
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Posted By J Knight
James,
If you are working in the Residential care sector there is some guidance in HSG220 'Health and Safety in Care Homes'. If you're in the NHS there are HTMs and HBNs which give guidance. If you work elsewhere then the guidance in these would still be applicable.
What you need is one of two things:
Circulating water at a temperature of over 50 degrees which has been in a Calorifier at over 60, plus TMV3 type valves on all your sensitive outlets. You will need unregulated hot water in any kitchen and at least one in the Nursing area if a hospital or care home; or
Some kind of chemical (Silver/Copper Ion for example) or UV sterilisation system when you can store and circulate water at 43 degrees.
In the first case it is important to measure your temperature on return to the calorifier as it must remain above 50 degrees throughout its circulation.
There is LACS guidance to this on the HSE website which indicates that HSE does not usually take enforcement action on unregulated wash basin outlets, the real problem is baths and showers,
John
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Posted By ohreally
We work at water leaving a calorifier at around 65° and discharging at the tap at over 50° within 1 minute.
Cold water should be within 2° of incoming supply temp within 2 minutes at full run-off.
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Posted By Adrian Watson
Where there is a scalding risk then water should be delivered at 41-43 C. Search the HSE website for care homes.
Regards Adrian
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Posted By Chris Packham
Water for hand washing should be below 40 deg. C. Water hotter than this has been shown to disturb the lamellar layer in the skin (the layer of lipids in the lower stratum corneum that provides an essential element of the skin's barrier properties), reducing the skin's ability to act as a barrier. It can take the skin several hours to recover its normal barrier properties.
Chris
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Posted By TT
The normal in care homes seems to be about 42 degrees - normally regulated by a TMV.
If you're fitting TMV's to avoid the scalding risk then ensure they are fitted as close as possible to the actual outlet to minimise the length of pipework where legionella may have a chance to proliferate. To meet the guidance in L8 you'll need to try and demonstrate that water is circulating at or above 50o still so consider access to at least a small section of unlagged pipework to get a surface temperature or similar at your sentinel outlets.
Dependant on size of installation, it may well be more cost and practically effective to utilise a chemical or UV disinfection system as alluded to in an earlier post.
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Posted By TT
Also forgot to second the earlier post that stated that kitchen needs unregulated hot water.
It does. :)
Wash hand basins can be fitted with TMV's or mixer taps but the general sinks should be provided with nice hot water or you won't get your mugs nice and clean. Having only warm water in a commercial kitchen, for example, would probably earn you a Hygiene Improvement Notice.
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