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Scope and Status of Technical Booklet P
NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
This Technical Booklet, which takes effect on 31st October 2012, is one of a series that has been prepared by the Department of Finance and Personnel (the Department) for the purpose of providing prac
Applicable Regulations
NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
The guidance contained in this Technical Booklet relates only to the requirements of regulations 84, 88 and 89. The work will also have to comply with all other relevant requirements of the Building R
Materials and Workmanship Requirements
23NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Any building work which is subject to requirements imposed by Part A of the Building Regulations should be carried out in accordance with regulation 23 of those regulations. Guidance on meeting these
Named standards
NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Where this Technical Booklet makes reference to a named standard, the relevant version of the standard is the one listed in the Appendix. However, if this version has been replaced or updated by the i
Diagrams
NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
The diagrams in this Technical Booklet supplement the text. They do not show all the details of construction and are not intended to illustrate compliance with any other requirement of the Building Re
Protected buildings
NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
District councils have a duty to take account of the desirability to preserve the character of protected buildings when carrying out their functions under Building Regulations. Therefore, where work i
conservationOther legislation
NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
The provisions of this Technical Booklet relate to the requirements of Building Regulations and do not include measures which may be necessary to meet the requirements of other legislation. Such other
The Workplace (Health, Safety and Welfare) Regulations (Northern Ireland) 1993
NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
The Workplace (Health, Safety and Welfare) Regulations (Northern Ireland) 1993 (the Workplace Regulations) contain some requirements which affect building design. The main requirements are now covered
flatsnon-domesticDocument title and scope
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-appliancesSanitary appliances - general requirements
86NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Every sanitary appliance shall have smooth and readily cleansed, non-absorbent surfaces and shall discharge through an effective trap of suitable dimensions. Every washbasin, bath and shower shall hav
drainagenon-domesticSanitary accommodation location and access
87NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Sanitary accommodation in any building other than a dwelling shall not open directly into a room used for kitchen purposes. Any sanitary accommodation which can be entered directly from a room used fo
drainagenon-domesticUnvented hot water storage systems - safety devices
88(1)-(2)NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
This regulation shall apply to any hot water storage system (other than a system or part of a system used solely for space heating or an industrial process) that has a storage vessel which— (a) has a
protection-from-fallingDischarge from unvented hot water storage safety devices
88(3)NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Any discharge from devices provided for the purpose of paragraph (2) shall be conveyed safely to where it can be seen readily and will cause no danger to people.
protection-from-fallingDomestic 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-domesticdwellingenergyCertification of Unvented Hot Water Storage Systems
2.6NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
by a certification body having National Accreditation Council for Certification Bodies (NACCB) accreditation as complying with BS EN 12897; (c) have controls over the heating source or sources complyi
sanitary-applianceshot-water-safetyControl on Heating Sources
2.7NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Devices to control the heating source or sources should be supplied by the manufacturer as part of the unit or package, and should comply with paragraphs 2.9 and 2.10. However, an indirectly heated sy
hot-water-safetyunvented-systemsSystems with a Storage Vessel Over 500 Litres or Over 45 kW
2.8NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
An unvented hot water storage system, whether heated directly or indirectly, having a storage vessel which has a capacity of more than 500 litres or a power input of more than 45 kW will generally be
hot-water-safetyunvented-systemslarge-capacityTemperature Safety Devices
2.9NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
An unvented hot water storage system should have the following safety devices to limit the temperature of the stored water – (a) a non self-resetting thermal cut-out on each heating source, complying
hot-water-safetyunvented-systemsscalding-preventionThermal cut-out wiring for indirectly heated systems
2.10NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Where the system is indirectly heated the non self-resetting thermal cut-out should be wired to a motorised valve or some other device which is – (a) approved by a member of EOTA; or (b) approved by a
unvented-hot-waterindirect-heatingthermal-safetyPressure control devices
2.11NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
An unvented hot water storage system should have the following devices to control the pressure within the system – (a) a pressure reducing valve complying with BS EN 1567; and (b) an expansion valve c
unvented-hot-waterpressure-controlCheck valve and expansion vessel
2.12NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
An unvented hot water storage system should also have – (a) a check valve complying with BS EN 13959 to prevent the expansion of water to the cold supply; and (b) an expansion vessel complying with BS
unvented-hot-waterbackflow-preventionexpansionTundish installation and discharge requirements
2.13NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Each temperature relief valve and expansion valve should discharge through a metal pipe either individually, or via a manifold, to a tundish incorporating an air break. Where the discharge is individu
unvented-hot-watersafety-dischargescalding-riskaccessibilityDischarge pipes from tundishes - General requirements
2.14NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
A discharge pipe from a tundish should – (a) be made of – (i) metal; or (ii) other material that has been demonstrated to be capable of safely withstanding the temperatures of the water discharged and
drainagescaldingunvented-hot-water-storageHydraulic resistance calculation for discharge pipes
2.15NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
In calculating the hydraulic resistance of a discharge pipe the resistance of straight lengths, elbows and bends should be taken into account. If a discharge pipe is of copper its size should be calcu
drainagescaldingunvented-hot-water-storageVisibility of discharge from safety devices
2.16NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
The discharge from a safety device which may consist of scalding water and steam, should be visible at the tundish and should also be visible at the final point of discharge.
drainagescaldingunvented-hot-water-storageAcceptable discharge arrangements
2.17NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Acceptable discharge arrangements include – (a) below a fixed louvred grating and above the water seal in a trapped gulley (see Diagram 2.1); or (b) downward discharge at low level but no less than 10
drainagescaldingunvented-hot-water-storageexternal-spaceSizing of copper discharge pipe D2 for temperature relief valves
Table 2.1NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Valve outlet size Minimum size of discharge pipe D1* Minimum size of discharge pipe D2* from tundish Maximum resistance allowed, expressed as a length of straight pipe (i.e. no elbows or bends) Resist
drainagescalding-riskWorked example for discharge pipe sizing
NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
The example below is for a G1/2 temperature relief valve with a discharge pipe (D2) having 4 No. elbows and a length of 7 m from the tundish to the point of discharge. From Table 2.1. Maximum resista
drainagescalding-riskTypical discharge pipe arrangement
Diagram 2.1NI-wide·Technical Booklet P Sanitary Appliances Unvented Hot Water Storage and Scalding
Diagram 2.1 Typical discharge pipe arrangement showing: metal discharge pipe (D1) from temperature relief valve to tundish (300 mm minimum / 500 mm maximum tundish); metal discharge pipe (D2) from tun
drainagescalding-riskPrevention 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
dwellingenergy