Unit 316 session 1 Hot water legislation

​Unit 316 Domestic hot water systems

​Hot water legislation

​British standards 
BS EN 806

BS EN 806​
This British Standard specifies requirements for, and gives guidance on, the design, installation, alteration, testing and maintenance of services supplying hot water for domestic use within buildings.  

​The Water Supply (Water Fittings) Regulations 

Regulation 5 of the Water Supply (Water Fittings) Regulations requires that the water undertaker must be notified before any work is commenced on most types of plumbing installations. Anyone who installs or uses the installation without their written consent could be committing a criminal offence.  

​The Building Regulations document G 

​The Building Regulations document G 

 

• G1 Cold water supply 

• G2 Energy efficiency 

• G3 Hot water supply and systems 

• G4 Sanitary conveniences and washing facilities  

• G5 Bathrooms  

• G6 Kitchens and food preparation areas  

​Types of hot water system and their layout requirements 

Open Ended

How many types of hot water system can you name?

There are 2 main types of hot water systems:

Centralised
Localised

​Types of centralised hot water supply systems 

​Centralised systems are those where the source of hot water supply is sited centrally in the property for distribution to all of the hot water outlets.
These can be divided into: 

• centralised open-vented hot water systems 

• centralised unvented hot water systems 

• centralised instantaneous hot water systems. 

​Centralised open-vented hot water systems 

They may be further sub-divided into: 

• the direct system 

• the indirect system 

• the double-feed indirect system 

• the single-feed, self-venting indirect system 

​An indirect system uses an indirect-type hot water storage cylinder, which contains some form of heat exchanger to heat the secondary water.

There are two distinct types: 

• the double-feed indirect hot water storage cylinder 

• the single-feed, self-venting indirect hot water storage cylinder 

​Open vented indirect (double feed type) hot water storage system

​Open vented indirect (single feed, self-venting type) hot water storage system

​This system uses a single feed, self-venting indirect cylinder, often referred to by its trade name – the ‘primatic’ cylinder. It contains a special heat exchanger, which uses air entrapment to separate the primary water from the secondary water.

Multiple Choice

What does BS EN 806 primarily address?

• Electrical installations in buildings

• Design and installation of hot water services

• Structural requirements for buildings

• Ventilation systems in residential areas

Multiple Choice

Which regulation under the Water Supply (Water Fittings) Regulations mandates notifying the water undertaker before plumbing work commences?

• Regulation 2

• Regulation 5

• Regulation 8

• Regulation 12

Multiple Choice

What document outlines the six areas covered by Building Regulations, including hot water supply and systems?

• Building Regulations document A

• Building Regulations document G

• Building Regulations document E

• Building Regulations document K

Multiple Choice

What are the three main types of centralised hot water systems

• Open-vented, closed-vented, and semi-vented

• Pressurised, non-pressurised, and mixed

• Open-vented, unvented, and instantaneous

• Direct, indirect, and double-feed

Multiple Choice

How can centralised open-vented hot water systems be further sub-divided?

• Primary and secondary systems

• Closed and open-loop systems

• Direct, indirect, double-feed, and single-feed self-venting

• Pressurized and gravity-fed systems

Multiple Choice

What distinguishes an indirect hot water storage cylinder from a direct one?

• Presence of a heat exchanger

• Material composition

• Size of the storage tank

• Operating pressure

Multiple Choice

Which type of hot water storage cylinder uses air entrapment to separate primary and secondary water?

• Direct hot water storage cylinder

• Open-vented indirect hot water storage cylinder

• Single-feed indirect hot water storage cylinder

• Instantaneous hot water storage cylinder

Multiple Choice

Which Building Regulations document specifically covers cold water supply and energy efficiency in buildings?

• Document A

• Document G

• Document E

• Document K

Multiple Choice

In centralised systems, what is the function of a double-feed indirect hot water storage cylinder?

• Separation of primary and secondary water

• Simultaneous heating of cold and hot water

• Direct distribution of hot water to outlets

• Storage of hot water without a heat exchangerhot water

Match

Match the following cylinders.

A Single feed indirect cylinder

A Direct cylinder

An indirect cylinder

• A Single feed indirect cylinder

• A Direct cylinder

• An indirect cylinder