Honeywell International - Schools should install
thermostatic mixing valves to prevent scalding
Schools and nursery schools should act now to
ensure children and staff cannot be scalded by hot water, warns
Honeywell, the leading manufacturer of water valves and heating
controls.
Regulations require that a thermostatic mixing valve (TMV), which
ensures scalding water cannot be provided at the point of delivery,
is installed on showers and baths (set to a maximum temperature of
43 degrees C in the latter case) and is recommended for wash basins.
The new scale-resistant Honeywell TM300 is designed for “under-bath”
installation on both high and low pressure systems, and certified to
the new Buildcert TMV2 scheme, acceptable in all schools and
nurseries except those used by the severely disabled; these require
a valve such as the Honeywell TM200VP, rated to the higher TMV3
standard.
The new Honeywell TM300 is one of very few TMV2 valves certified for
use with the full range of bathroom appliances: bidets, showers,
washbasins and bathtubs. It employs a highly sensitive wax element
which controls the hot and cold water inlets to provide a safe
uniform temperature between 38 and 46 degrees C, as set by the
installer. In addition, it ensures safety by cutting off the hot
water inlet automatically if the cold supply fails.
Honeywell explains that the BuildCert TMV scheme recommends the
following maximum hot water temperatures for use in all premises: 46
degrees C for bath fill; 41 degrees for showers and washbasins; and
38 degrees C for bidets. However, while 46 degrees C is the maximum
temperature for water from the bath hot tap, it takes into account
the margin of error inherent in TMV valves and temperature loss in
metal baths, especially in cold bathrooms. It is not a safe bathing
temperature for adults or children. The British Burns Association
recommends 37 to 37.5 degrees C as a comfortable bathing temperature
for children. In premises covered by the Care Standards Act 2000,
the maximum water outlet temperature is 43 degrees C.
For more advice on regulating maximum hot water temperatures, see
Building Research Establishment (BRE) Building Bulletin 87 (2nd
edition) and The School Premises Regulations/National Minimum Care
Standards Section 25.8.
Email:
water.control@honeywell.com
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