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DOMESTIC WATER SYSTEMS Regulations and Standards

Domestic Water Systems
Gravity system – vented hot and cold water storage
Usually identified by the presence of a hot water storage cylinder in the airing cupboard, AND
the presence of a cold water storage cistern in the loft. 

• Water is fed to the hot water cylinder from the cold water cistern. 

• Water is fed to the cold water cistern from the incoming mains.

• The cold water cistern should be at least one metre above the shower head for a satisfying shower otherwise a booster pump will be required to improve water pressure and water flow. 

This system is open or ‘vented.’

High pressure system – unvented, mains fed, hot water storage 
Usually identified by the presence of a hot water storage cylinder which has a special expansion vessel attached to it. BUT there will be no cold water storage tank in the loft. 

• Water is fed to the hot water cylinder by the incoming mains. 

• This water is heated by a separate boiler or immersion heater.

• Since the hot and cold water is under high mains pressure the shower will be a very satisfying powerful shower. 

Combi system – high pressure with no water storage 
Usually identified by no hot water cylinder in the airing cupboard, no cold water cistern tank in the loft BUT the presence of a 'Combi' or 'combination' boiler which heats water as it is required.. 

• Provides hot water as and when it is required with no storage.

• A shower pump cannot be added to a combi system.

Water (Water Fittings) Regulations 1999
The Water Fittings Regulations (or Byelaws 2000 in Scotland) are national requirements for the design, installation and maintenance of plumbing systems, water fittings and water-using appliances. Their purpose is to prevent misuse, waste, undue consumption or erroneous measurement of water and to prevent contamination of drinking water.

Water Byelaws
The Water Fittings Regulations replace water byelaws (in governing the prevention of waste, misuse, undue consumption, contamination and erroneous measurement of public water supplies in domestic and commercial plumbing installations) and represent important protection for public health and the environment. The regulations are based on performance standards, e.g. British Standards or those European Standards being mandated under the Construction Products Directive.

Building Regulations
The Building Regulations are a set of minimum requirements designed to secure the health, safety and welfare of people in and around buildings and to conserve fuel and energy in England and Wales. They are made by the Secretary of State under Powers given by Section 1 of The Building Act 1984.

Local Building Control Office
Building Control is an umbrella term covering all Local Authority Building Control Departments in England & Wales. These Departments have a statutory duty to enforce Building Regulations. The Building Regulations are designed to ensure the highest standards of construction apply to all buildings, and that the health and safety of people using and working in and around buildings is adequately provided for.

I.E.T Wiring Regulations
The IET manages the national committee JPEL/64 which prepares and updates the regulations for
the safety of electrical installations in buildings, and publishes the standard BS 7671 (Wiring Regulations). It also provides and publishes extensive guidance upon the standard as well as
related codes of practice.

Part P of the Building Regulations
Part P, brings domestic electrical installation work in England and Wales under the legal framework
of the Building Regulations. It will, for the first time, place a legal requirement for safety upon electrical installation work in dwellings, although the sector is highly regarded for its high levels of conformity with its chief standard, BS 7671.

BSI British Standards
BSI British Standards' publications give recommendations on a wide range of building and construction matters including materials, testing, health and safety, access and regulations. They are essential reference for architects, developers, building owners, site managers, building contractors, structural engineers, materials specifiers and other interested parties.

British Standards Institution
Always check for the most up-to-date version of the standard

BS 7671 - (otherwise referred to as) I.E.E 17th Edition Wiring Regulations
The IET prepares regulations for the safety of electrical installations for buildings, the IEE Wiring Regulations (BS 7671) is the applicable standard for the UK and similar requirements are implemented in many other countries.

BS 3036 –BSHD60269-2-BS88-2
The devices used to detect such overloads, and to break the circuit for protection against them, fall into three main categories: 
1) Semi-enclosed (rewirable) fuses to BS 3036 and cartridge fuses for use in plugs to BS 1362.

2) Low voltage fuses. Household top BSHD60269-3 and BS88-3.

3) Circuit breakers, miniature and moulded case types to BS EN 60898-1, and BSEN60898-2.

BS 6700
Specification for design, installation, testing and maintenance of services supplying water for
domestic use within buildings and their curtilages.

BS 7942
Thermostatic mixing valves for use in care establishments. Requirements and test methods

BS EN ISO 1456
Metallic and other inorganic coatings . Electrodeposited coatings of nickel, nickel plus chromium, copper plus nickel and of copper plus nickel plus chromium.

NHS Specification DO8
A specification for thermostatic mixing valves with enhanced thermal performance.

References to water regulations apply to England and Wales. Data may vary for Scotland and Northern Ireland - please check for specific regulations applicable.


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For Professionals
Regulations and Standards
Building Regulations Approved Doc M
Disability Discrimination Act
Hot Water Safety -

Shower Controls
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Bathroom Furniture
Domestic Water Systems

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in public buildings

Brassware & TMVs
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