Page 358 - The City and Guilds Textbook: Plumbing Book 1 for the Level 3 Apprenticeship (9189), Level 2 Technical Certificate (8202) and Level 2 Diploma (6035)

The City & Guilds Textbook: Plumbing Book 1

1 SOURCES OF INFORMATION

RELATING TO WORK ON HOT

WATER SYSTEMS

Here, you will learn to identify and use the information sources that should be
referred to when designing hot water systems, including:
● statutory regulations
● industry standards
● manufacturer technical instructions.
Statutory regulations

The installation of hot water systems is governed strictly by various regulations:

● the Building Regulations Approved Document G3 2010
● the Building Regulations Approved Document L1A/B 2010
● the Water Supply (Water Fittings) Regulations 1999
● the Gas Safety (Installation and Use) Regulations
● the IET (18th Edition) (BS 7671:2008) Wiring Regulations.

The Building Regulations Approved Document G3 2010
In the past, Building Regulations Approved Document G3 related only to
unvented hot water supply systems. In 2010 it was updated to encompass all
hot water delivery systems in domestic dwellings. It is divided into four parts:
1 Part 1 of G3 is a new requirement. It states that heated wholesome water
must be supplied to any washbasin or bidet that is situated in or adjacent to
a room containing a sanitary convenience, to any washbasins, bidets, fixed
baths or showers installed in a bathroom, and any sink in an area where
food is prepared.
2 Part 2 is an expanded requirement. It states that any hot water system,
INDUSTRY TIP including associated storage (including any cold water storage cistern) or
expansion vessel, must resist the effects of any temperature or pressure that
Copies of the Building may occur during normal use as a consequence of any reasonably anticipated
Regulations Approved fault or malfunction. This amendment was enforced after the failure of an
Documents G3 2010 and immersion heater thermostat that caused the collapse of a storage cistern
L 2010 can be downloaded containing water almost at boiling point.
free from these links: 3 Part 3, again, is an amended requirement. It states that any part of a hot
www.gov.uk/government/ water system that incorporates a hot water storage vessel must include
publications/sanitation- precautions to ensure that the temperature of the stored water does not
hot-water-safety-and- exceed 100°C and that any discharge from such safety devices is safely
water-efficiency-approved-
document-g conveyed to a point where it is visible without constituting a danger to
persons in or about the building.
www.gov.uk/government/ 4 Part 4 states that any hot water supply to a fixed bath must include provision
publications/conservation-
of-fuel-and-power-approved- to limit the temperature of the discharged water from any bath tap to not
document-l in excess of 48°C. This requirement applies to any new-build or property
conversions. It is a new requirement that is intended to prevent scalding.

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