Appropriate Standards

One of the routes that may be used to demonstrate a product is a suitable quality and standard is to test it against an appropriate British Standard

The regulations do not include a definition of how a British Standard should be assessed for appropriateness. WRAS have developed a method for assessing standards for appropriateness, taking into consideration all parts of the regulations.

  • The assessment of each standard was valid at the time of listing on this page.
  • The assessment is invalidated if the standard is withdrawn or updated.
  • As these standards are not identified specifically in the regulations there is a risk that Water Companies may not accept the standard as being appropriate.
  • The assessment may be affected if regulations, regulators specifications or regulators guidance is amended or issued
  • ​Testing must be performed by a recognised laboratory that has the appropriate standard on their scope of accreditation.
WRAS, accordingly, accepts no liability for loss of goodwill, business, revenue or profits, anticipated savings or wasted expenditure (whether reasonably foreseeable or not) or indirect or consequential loss arising from or in connection with the WRAS test and acceptance criteria.


WRAS have assessed the following standards as being appropriate, with the following restrictions or conditions. All products tested must be within the scope of the stated standard.

British Standard Reference Number

Standard Title and Limitations

BS EN 200:2008

Sanitary tapware. Single taps and combination taps for water supply systems of type 1 and type 2. General technical specification

In addition to acceptance of this standard, evidence of backflow protection should meet the requirements and definitions of the HUK1, AUK2 or AUK3

B​S 1212-4:2016

F​loat operated valves. Specification for compact type float operated valves for WC flushing cisterns (including floats)

The vacuum test for backflow prevention (Test 6.2) is a vacuum test only and not in accordance with paragraph 15(1) of schedule 2 of the regulations. Additional backflow testing is required when installed in a WC Cistern.

For use in WC's only
Operating pressures of between 0.1 bar and 10 bar – Cold water use only
M​ay be subject to change following the publication of the WC Suite Performance Specification

BS 7291 parts 1,2 & 3:2010

T​hermoplastics pipe fitting systems for hot and cold water for domestic purposes and heating installations in buildings.

Part 1: General requirements
Part 2: Specification for polybutylene (PB) pipe and associated fittings
Part 3: Specification for cross‑linked polyethylene (PE-X) pipes and associated fittings
Approvals will be limited to Nominal system flow temperatures, Maximum system service temperature, system malfunction temperature and system maximum working pressures detailed in Part 1 Table 1
Not suitable for continuously operated re-circulating system applications

B​S EN 13618:2016

Flexible hose assemblies in drinking water installations. Functional requirements and test methods
​Limited to maximum operating temperature of 1 MPa (10 bar) and a maximum temperature 70°C
All non-metallic materials complying with BS6920
All hoses to be installed where light is excluded.
Maximum length 2000mm

B​S EN 14506:2005

Devices to prevent pollution by backflow of potable water. Automatic diverter. Family H, type C
Only acceptable for domestic use only unless additional backflow is installed.
Limited to pressures up to 1 MPa (10 bar) and temperatures up to 65 °C
Only for installation with no downstream closing device.
Limitation of 1 hour at 90 °C

BS EN ISO 21003:2008

Multilayer piping systems for hot and cold water installations inside buildings Parts 1, 2, 3, 5 & 7

Part 1: General

Part 2: Pipes

Part 3: Fittings

Part 5: Fitness for purpose of the system

Part 7: Guidance for the assessment of conformity [Technical Specification]

Subject to non-metallic materials complying with BS6920

B​S EN ISO 15874:2013 Parts 1, 2, 3 & 5


Plastics piping systems for hot and cold-water installations - Polypropylene (PP)

Part 1: General

Part 2: Pipes

Part 3: Fittings

Part 5: Fitness for purpose

Subject to non-metallic materials complying with BS6920

F​or above ground use only.

B​S EN 248:2002

Sanitary tapware - General specification for electrodeposited coatings of Ni-Cr

B​S EN 246:2021

Sanitary tapware — General specifications for aerators

B​S EN 817:2008

Sanitary tapware — Mechanical mixing valves (PN 10) — General technical specifications

Approvals will be limited to 10 bar, for mechanical mixing valves for use with sanitary appliances installed in rooms used for bodily hygiene (cloakrooms, bathrooms, etc.) and in kitchens, i.e. for use with baths, wash basins, bidets, showers and sinks.

Backflow protection must be in accordance with Schedule 2. The air gap dimension must comply with Schedule 2 or an appropriate backflow protection device in accordance with Schedule 2 must be used and will be reflected in the appropriate IRN.

B​S EN 1111:2017

Sanitary tapware - thermostatic mixing valves (PN 10) - general technical specification

Approvals will be limited to 10 bar for thermostatic mixing valves (TMV) and includes test methods for the verification of mixed water temperature performance at the point of use below 45 °C.

It should be noted that all tests are required to claim compliance with the standard.

B​S EN 1112:2008

Sanitary tapware - Shower outlets for sanitary tapware for water supply systems type 1 and type 2. General technical specification

B​S EN 1113:2015

Sanitary tapware - Shower hoses for sanitary tapware for water supply systems of type 1 and type 2. General technical specification

B​S EN 7686:2005

Plastic Pipe & Fittings - Determination of opacity



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