• direct immersion heater thermostat/non-self-
resetting thermal cut-out to BS 3955 : 1986
• motorised valve to BS 3955 : 1986
• expansion vessel to BS 6144 : 1990.
19.4 An examination was made of existing data
relating to:
• adequacy of installation instructions
•
practicability of installation by the
competent person
• electrical safety
• effect on water quality and prevention of waste
of water
• properties in relation to fire
• practicability and adequacy of maintenance
requirements
• durability of materials used.
20 Investigations
The manufacturing and assembly process was
examined, including the methods adopted for
quality control, and details were obtained of the
quality and composition of materials used.
Bibliography
BS 864-2 : 1983
Capillary and compression tube
fittings of copper and copper alloy — Specification
for capillary and compression fittings for copper tubes
BS 2879 : 1980
Specification for draining taps
(screw-down pattern)
BS 3955 : 1986
Specification for electrical
controls for household and similar general purposes
BS 5449 : 1977
Code of practice for central
heating for domestic premises — Forced circulation
hot water systems
BS 6144 : 1990
Specification for expansion
vessels using an internal diaphragm, for unvented
hot water supply systems
BS 6282-1 : 1982
Devices with moving parts for
the prevention of contamination of water by
backflow — Specification for check valves of
nominal size up to and including DN 54
BS 6283-1 : 1991
Safety and control devices for
use in hot water systems — Specification for
expansion valves for pressures up to and including
10 bar
BS 6283-3 : 1991
Safety and control devices for
use in hot water systems — Specification for
combined temperature and pressure relief valves for
pressures from 1 bar to 10 bar
BS 6283-4 : 1982
Safety and control devices for
use in hot water systems — Specification for drop-
tight pressure reducing valves of nominal size up to
and including DN 54 for supply pressures up to
and including 12 bar
BS 6700 : 1997
Specification for design,
installation, testing and maintenance of services
supplying water for domestic use within buildings
and their curtilages
BS 7206 : 1990
Specification for unvented hot
water storage units and packages
BS EN 1057 : 1996
Copper and copper alloys.
Seamless, round copper tubes for water and gas in
sanitary and heating applications
BS EN 60335-2.73 : 2003
Household and
similar electrical appliances — Safety — Particular
requirements for fixed immersion heaters
MOAT No 38 : 1986
The assessment of unvented
hot water storage systems and the approval and
surveillance of installers
On behalf of the British Board of Agrément
Date of Second issue: 10th September 2004 Chief Executive
*Original Detail Sheet issued 23rd September 1996. This amended version includes change of product name and
reference to revised Regulations and Standards.
British Board of Agrément
P O Box No 195, Bucknalls Lane
Garston, Watford, Herts WD25 9BA
Fax: 01923 665301
©2004
For technical or additional information,
contact the Certificate holder (see
front page).
For information about the Agrément
Certificate, including validity and
scope, tel: Hotline
01923 665400
,
or check the BBA website.
e-mail: mail@bba.star.co.uk
website: www.bbacerts.co.uk
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