Unit 308 Session 1 sources of information relating to hot water

​HOT WATER SYSTEMS

​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.

​SOURCES OF INFORMATION RELATING TO WORK ON HOT WATER SYSTEMS

​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.

​Use the link below to research the Building regulations approved document G and answer the following questions:

Doc G.pdf

Drag and Drop

G3. (1) There must be a suitable installation for the provision of ​

Placeholder

wholesome water or heated softened wholesome water to:



(a) any ​

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or ​

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provided in or adjacent to a room containing a ​

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convenience;

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heated

washbasin

bidet

sanitary

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G3. (1) There must be a suitable installation for the provision of ​heated wholesome water or heated softened wholesome water to:



(b) any ​

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, bidet, fixed ​

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and ​

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in a bathroom;



(c) any ​

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provided in any area where ​

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is prepared.

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washbasin

bath

shower

sink

food

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(3) A hot water system that has a hot water storage vessel shall incorporate precautions to:



(a) prevent the temperature of the water stored in the vessel at any time exceeding ​

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;

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100˚C

85˚C

55˚C

110˚C

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(4) The hot water supply to any fixed bath must be so designed and installed as to incorporate measures to ensure that the temperature of the water that can be delivered to that bath does not exceed ​

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.

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48˚C

58˚C

68˚C

78˚C

Open Ended

Within the previous questions we found that we must prevent the temperature of the water stored in the vessel at any time exceeding ​100˚C, why do you think this is?

Open Ended

We also discovered that the building regulation part G3 states:

(4) The hot water supply to any fixed bath must be so designed and installed as to incorporate measures to ensure that the temperature of the water that can be delivered to that bath does not exceed 48˚C.

Again why do you think this is?

To ​Prevent scalding

​This document promotes the conservation of fuel and power.

The basic outline to this document is that the building and services contained within a dwelling must be designed and installed to actively reduce the amount of CO2 produced.

The building fabric must contain insulation to limit heat loss and heating appliances, associated controls and equipment and lighting systems must all reduce the energy wasted.

Pipes and storage vessels must also be insulated to reduce the waste of energy.

​The Building Regulations Approved Document L1A/B 2013

In many respects, the Water Regulations mirror the Building Regulations, and these two documents should be consulted before undertaking any design or installation of hot water systems.

​​The Water Supply (Water Fittings) Regulations 1999

​Hot water supply is covered in Section 8 of Schedule 2 of the Water Supply (Water Fittings) Regulations.

​Other sources of information you may need to use when installing a hot water system are:

The Gas Safety (Installation and Use) Regulations 1998

The IET (18th Edition) (BS 7671:2008) Wiring Regulations

Industry standards

Manufacturer technical installation and maintenance instructions