Page 423 - The City and Guilds Textbook: Plumbing Book 1 for the Level 3 Apprenticeship (9189), Level 2 Technical Certificate (8202) and Level 2 Diploma (6035)

Chapter 6 Hot water systems

Schools for Bath Yes, but 43°C max Yes TMV3
the severely Basin Yes
disabled, Shower
including
nursery
Bath Yes TMV3
Basin Yes
NHS hospital Shower Yes
Bath Yes TMV3
Basin Yes
Private hospital Shower Yes

4 PREPARE FOR THE INSTALLATION

OF SYSTEMS AND COMPONENTS

Preparing for installation deals with the preparatory work required before an
installation can commence:

● consulting drawings and specifications
● positioning components in line with the regulations, manufacturers’
instructions and the customer’s wishes
l marking out pipework runs
● making a fittings list.
This subject was dealt with in detail in Chapter 5, Cold water systems.

5 INSTALL AND TEST SYSTEMS

AND COMPONENTS

Here, we will look at the general requirements for hot water systems within
a dwelling, including:
● hot water pipework installation
● installing storage cylinders and cisterns
● temperature control
l the use of thermostatic blending valves
l insulation of pipework
● expansion of hot water pipework.

The installation of hot water pipework
to BS EN 806

The installation of hot water pipework is covered in BS EN 806. Materials used
are usually copper tubes to BS EN 1057 and polybutylene pipes and fittings
as these are the only materials that do not cause contamination of the water
and can withstand the temperatures associated with hot water distribution
pipework. The pipework should be capable of withstanding at least 1.5 times
the normal operating pressure of the system and sustained temperatures of
95°C, with occasional temperature increases up to 100°C to allow for any
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