Page 357 - The City and Guilds Textbook: Plumbing Book 1 for the Level 3 Apprenticeship (9189), Level 2 Technical Certificate (8202) and Level 2 Diploma (6035)

HOT WATER SYSTEMS CHAPTER 6

CHAPTER 6

INTRODUCTION

A supply of hot water is essential. We use it every day for personal hygiene, cooking and clothes washing. It is
a vital resource for combating germs and bacteria, but it can also cause harm if the temperature of the water is
not controlled.
In this chapter, will we investigate the many methods of supplying hot water in the home. We will look at the
systems of hot water supply, the installation methods we should employ, the appliances we use to generate
hot water and the ways in which we can control its temperature to safe, usable limits. We will also explore some
of the common hot water-related faults that occur and look at ways of maintaining systems so that they give
optimum performance.
By the end of this chapter, you will have knowledge and understanding of the following:
● sources of information relating to work on hot water systems
● hot water systems and components
● system safety and efficiency
● how to prepare for the installation of systems and components
● how to install and test systems and components
● how to decommission systems and components
● how to replace defective components.

ACTIVITY
As a starting point to this unit, consider the following questions:
● What are the recommended design temperatures for hot water systems?
● What safety devices are required in hot water systems?
● How is Legionella prevented in hot water systems?
● Where can faults occur in hot water systems?

KEY POINT
There are some areas that come under the subject of hot water – such as
sanitary appliances, taps, valves, pumps and backflow protection – that are
identical to those areas discussed within other chapters in this book. Where
such duplication exists, you will be encouraged to read and research within
those chapters. In most cases, further reading is encouraged within Chapter
2, Common processes and techniques, Chapter 3, Scientific principles, and
Chapter 5, Cold water systems.

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