Since the introduction of BS 9251:2014 all fire sprinkler systems in residential properties are classed as residential sprinklers. Previously sprinklers were divided into domestic and residential sprinklers now they are divided into category 1, 2 and 3 residential sprinklers. Category 1 covers sprinklers in private homes, (previously domestic sprinklers) see more info on our page about home fire sprinklers.
Category 2 & 3 residential sprinkler systems are designed for buildings where more than 1 family lives i.e. multiple occupancy properties, flats, care homes etc. These are divided into two categories:
Includes larger blocks of flats (over 18M high) and small residential care homes (with10 residents or less), sheltered accommodation. This category of residential sprinklers generally requires tank sizes of between 3m3 to 4.5m3 with storage for up to 30 minutes water supply. Calculations are based on 1 or 2 sprinklers heads operating and an average flow of 84-100 litres/minute.
Includes larger residential care homes / nursing homes (with more than 10 residents) and also hostels. This category of residential sprinklers generally requires larger tank sizes of between 6m3 to 9m3 with storage for up to30 minutes water supply. Calculations are based on 4 sprinklers heads operating and an average flow of 168-200 litres/minute.
The following information summarises the key requirements for residential sprinkler systems:
Hazard Category
| System |
Category 1 (Typically a domestic property for a single family) A 32/50mm water main* Minimum water flow rate of 60 litres per minute. |
Category 2 (Typically a block of flats over 18m) A 50/63mm water main* Minimum water flow rate of 130 litres per minute. |
Category 3 (Typically a residential care home) A 63mm water main* Minimum water flow rate of 240 litres per minute. |
| Town Mains Fed |
3 bar (guide)* 3A unswitched spur (for alarm panel) Access to run pipe-work Effective stored water capacity between 1m3 and 1.5m3* Room for a self-testing pump |
4.5 bar (guide)* 3A unswitched spur (for alarm panel) Access to run pipe-work Effective stored water capacity between 3m3 and 4.5m3* Room for a self-testing pump |
6 bar (guide)* 3A unswitched spur (for alarm panel) Access to run pipe-work Effective stored water capacity between 6m3 and 9m3* Room for a self-testing pump |
| Pump and Tank Fed |
A proven infill to water tank (if provided there is a possibility that the tank size could be reduced) Single phase 230v electrical supply for self-testing pump (via type C MCB) 3A unswitched spur Access to run pipe-work |
A proven infill to water tank (if provided there is a possibility that the tank size could be reduced) Three-phase 400v electrical supply for a self testing pump (via type C MCB) 3A unswitched spur Access to run pipe-work |
A proven infill to water tank (if provided there is a possibility that the tank size could be reduced) Three-phase 400v electrical supply for a self testing pump (via type C MCB) 3A unswitched spur Access to run pipe-work |
* Subject to full hydraulic calculations
Further information on building regulations and fact sheets relating to domestic and residential fire sprinkler requirements and safety standards can found on this page.
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