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NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Technical Booklet P: 2012 Sanitary appliances, unvented hot water storage systems and reducing the risk of scalding
non-domesticdwellingsanitary-applianceshot-water-storagescalding-riskRegulation 84: Application and interpretation
84NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
84.—(1) Regulation 89 applies when a dwelling is— (a) erected; or (b) formed by a material change of use. (2) In this Part— "Domestic hot water" means water that has been heated for ablutionary, culin
dwellingsanitary-appliancesRegulation 85: Provision of sanitary appliances
85NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
85.—(1) A dwelling shall have at least one water closet, one washbasin and one fixed bath or shower. (2) A washbasin shall be provided, in the case of— (a) a dwelling, either in the same room as a wat
dwellingsanitary-appliancesDomestic hot water distribution system temperature control
89(1)NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
The domestic hot water distribution system shall be so designed and installed as to incorporate measures to ensure that the temperature of water that can be delivered is not excessive.
dwellingscaldingFixed bath hot water temperature limit
89(2)NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
The hot water supply to any fixed bath shall be so designed and installed as to incorporate measures to ensure that the temperature of water that can be delivered to that bath does not exceed 48 oC.
dwellingscaldingProvision of sanitary appliances, sanitary appliances, and sanitary accommodation
Regulations 85, 86, 87NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Regulation 85 Provision of sanitary appliances 86 Sanitary appliances 87 Sanitary accommodation 0.1 These are prescriptive regulations that must be followed therefore no guidance is given in this Tech
non-domesticdwellingflatsUnvented hot water storage systems
Regulation 88NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Regulation 88 Unvented hot water storage systems 0.2 Any hot water storage system with no vent pipe to the atmosphere (other than a system or part of a system used solely for space heating or an indus
dwellingnon-domesticflatsReducing the risk of scalding
Regulation 89NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Regulation 89 Reducing the risk of scalding 0.3 Any domestic hot water distribution system should be designed and installed to include measures to minimise the risk of scalding.
dwellingflatsScope of Section 1 - Unvented Hot Water Storage Systems
1.1NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
This Section contains provisions for an unvented hot water storage system. All the components within the system should be of adequate strength and capable of safely withstanding the temperatures and p
non-domesticdwellingfire-safetyenergyDefinition of Package
1.2NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Package – an unvented hot water storage system having factory fitted safety devices together with a kit containing pressure and other devices supplied by the package manufacturer, to be fitted by the
non-domesticdwellingenergyDefinition of Unit
1.2NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Unit – an unvented hot water storage system having safety devices and all other devices factory fitted by the unit manufacturer (see Diagram 1.2).
non-domesticdwellingenergyDefinition of Unvented Hot Water Storage System
1.2NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Unvented hot water storage system – includes a system with an unvented vessel for either – (a) storing domestic hot water for subsequent use; or (b) heating domestic hot water as it passes through an
non-domesticdwellingenergyLimitations on Heating Sources
1.3NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
An unvented hot water storage system should not be heated – (a) directly by a solid fuel heating appliance; or (b) indirectly by a sealed primary circuit which is heated by a solid fuel heating applia
non-domesticdwellingenergyInstallation Requirements and Qualified Operatives
1.4NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
The installation must be carried out by a person holding a current Registered Operative Identity Card for the installation of unvented hot water storage systems issued by – (a) the Association of Inst
non-domesticdwellingenergyUnvented hot water storage system — Package configuration
Diagram 1.1NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Diagram 1.1 Unvented hot water storage system — Package * Storage vessel with factory fitted safety devices Expansion vessel, expansion valve, tundish, temperature relief valve, pressure reducing va
dwellingnon-domesticflatsUnvented hot water storage system — Unit configuration
Diagram 1.2NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Diagram 1.2 Unvented hot water storage system — Unit * Expansion vessel, expansion valve, tundish, temperature relief valve, pressure reducing valve with strainer, stop valve, water main, discharge,
dwellingnon-domesticflatsMinimum safety devices for unvented hot water storage systems
2.1NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
To minimise the danger from excessive pressure, unvented hot water storage systems should incorporate a minimum of two independent safety devices in addition to any thermostat provided to control the
non-domesticdwellingenergyApproach to safety devices: energy cut-out and relief valve
2.2NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
One approach might consist of – (a) a non self-resetting energy cut-out to disconnect the supply of heat to the storage vessel in the event of the storage system overheating; and (b) a temperature rel
non-domesticdwellingenergyRelief valve restrictions for systems without automatic replenishment
2.3NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Temperature relief valves and combined temperature and pressure relief valves should not be used in systems which have no provision to automatically replenish the stored water (e.g. unvented primary t
non-domesticdwellingenergyCompliance with European Council Directives
2.4NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Any product designed and manufactured to comply with the requirements of a European Council Directive [e.g. 97/23/EC (Pressure Equipment Directive) or 2009/142/EC (Gas Appliances Directive), implement
non-domesticdwellingScope: systems up to 500 litres and 45 kW
2.5NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
The guidance under this heading contains provisions for an unvented hot water storage system, whether heated directly or indirectly, having a storage vessel which has a capacity of not more than 500 l
non-domesticdwellingenergyCompliance standards for unvented hot water storage systems
2.6NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
An unvented hot water storage system should – (a) comply with BS 6700+ A1 or BS EN 12897; (b) be a unit or package which has been certified – (i) as meeting the relevant requirements of regulation 88
non-domesticdwellingenergyPrevention of excessive domestic hot water temperatures
3.1NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Where the operating temperature of domestic hot water in the storage vessel in a dwelling is capable of exceeding 80 ºC under normal operating conditions (a situation that may occur in vessels used as
dwellingenergyReducing the risk of scalding at bath
3.2NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
The hot water supply temperature to a bath should be limited to a maximum of 48 ºC by the use of an in-line blending valve or other appropriate temperature control device, with a maximum temperature s
dwellingAcceptability of in-line blending valves
3.3NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
The acceptability of in-line blending valves can be demonstrated by compliance with the relevant harmonised European Standard such as BS EN 1111 or BS EN 1287 to demonstrate that the maximum temperatu
dwellingCompatibility of in-line blending valves and thermostatic mixing valves
3.4NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
In-line blending valves and composite thermostatic mixing valves (TMVs) should be compatible with the sources of hot and cold water that serve them.
dwellingSupply pipe length and high temperature flushing
3.5NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
The length of supply pipes between in-line blending valves and final outlets should be kept to a minimum in order to prevent colonisation by waterborne pathogens. Where intermittent use of a bath is a
dwellingFurther guidance on in-line blending valves
3.6NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Further guidance on the use of in-line blending valves can be found in BRE Information paper IP14/03 Preventing hot water scalding in bathrooms: using TMVs.
dwellingRelevant British Standards for Unvented Hot Water Storage and Sanitary Appliances
Appendix Publications referred toNI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
BS EN 257: 2010 Mechanical thermostats for gas-burning appliances. BS EN 1111: 1999 Sanitary tapware. Thermostatic mixing valves (PN 10). General technical specification. BS EN 1287: 1999 Sanitary tap
dwellingnon-domesticsanitary-appliancesunvented-hot-water-storagescalding-prevention