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Scope 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-domesticdwellingenergyMinimum 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-domesticdwellingenergyScope: 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
dwellingenergy