Page 466 - 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

 Table 7.6 Advantages and disadvantages of the reversed return system

Advantages Disadvantages
Eliminates the need for complex balancing It is difficult to install
procedures It is a more expensive system due to the
Can be used with sealed and open vented extra time taken on installation and the extra
systems, Y-plan or S-plan materials required
The system is Building Regulations The system installation requires careful
Document L compliant planning and design

Heat-producing appliances

So far in this chapter, we have looked at the different central heating systems
and their layouts. In this part of the chapter, we will investigate the different
appliances we can use to generate the heat required to warm the systems and
the different fuels they use.

Boilers used for central heating systems are generally heated by one of three
different fuels. These are:

1 solid fuel
2 gas
3 oil.

KEY POINT
The legal requirements for the installation of solid fuel and oil heat-
producing appliances, such as boilers, cookers and room heaters, are covered
in Building Regulations Document J: Heat Producing Appliances. The legal
requirements for the installation of gas appliances are given in the Gas
Safety (Installation and Use) Regulations. In all cases, the manufacturer’s
instructions must always be followed when installing heat-producing
appliances of any kind.
The governing bodies for the different fuels used with heating appliances are:
● gas – Gas Safe, www.gassaferegister.co.uk
● oil – OFTEC, www.oftec.org
● solid fuel – HETAS, www.hetas.co.uk

 Table 7.7 Comparison of appliance types to fuel types

Open flued Room sealed (natural draught) Room sealed (fan assisted) Freestanding / independent boilers Wall mounted Condensing Non-condensing (traditional) System boilers Cookers Open fire with high output back boiler Room heaters

Solid fuel ü û û ü û û ü û ü ü ü
Gas ü ü ü ü ü ü ü ü ü û û
Oil ü û ü ü ü ü ü ü ü û û

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