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Regulations
2
Regulations
Installation regulations
Current Gas Safety (Installation and Use) Regulations:
All gas appliances must be installed by a competent, registered gas
engineer, such as a Gas Safe registered engineer or British Gas engineer
in accordance with the current regulations.
Failure to install appliances correctly could lead to prosecution.
The appliance must be installed in accordance with, and comply to, the
current:
Gas Safety Regulations, IET Regulations, Building Regulations, Building
Standards (Scotland) (Consolidation),
Building Regulations (Northern Ireland), local water by-laws,
Health and Safety Document 635 (The Electricity at Work Regulations
1989) and any other local requirements.
EU Regulations No. 811/2013 - Energy Labelling.
Building Regulations Part L1A 2013 - new dwellings
If the installation is in a new build property or it is a first time installation
in an existing property, the heating systems must conform to current
building regulations Part L1A.
The exception to this are single storey, open plan dwellings where the
living area is more than 70% of the total usable floor area. Then this type
of dwelling can be controlled as one zone.
An alternative would be individual electronically controlled TRVs.
For dwellings with a floor area over 150m
temperature control for each zone is required. It is best practice to fit
Thermostatic Radiator Valves (TRV's) to all radiators except the area
where the room thermostat is sited.
Building Regulations Part L1B 2010 - existing dwellings
For appliance replacements on an existing system, it is not necessary to
zone the upstairs and downstairs separately, compliance with the zone
requirements can be achieved by a single room thermostat or
programmable room thermostat.
While the system is drained down, it is best practice to fit Thermostatic
Radiator Valves (TRV's) to all radiators except the area where the room
thermostat is sited.
British Standards
Where no specific instruction is given, reference should be made to the
relevant British Standard codes of Practice.
• BS7074:1
– Code of practice for domestic and hot water supply
• BS6891
– Installation of low pressure gas pipe work up to 28mm (R1)
• BS5546
– Installation of gas hot water supplies for domestic purposes
• EN12828
– Central heating for domestic premises
• BS5440:1
– Flues and ventilation for gas appliances of rated heating not
exceeding 70kW (net): Flues
• BS5440:2
– Flues and ventilation for gas appliances of rated heating not
exceeding 70kW (net): Air Supply
• BS7593
– Treatment of water in domestic hot water central heating systems
• BS6798
– Installation of gas fired boilers of rated input up to 70kW (net)
• BS7671
– IET Wiring Regulations
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, separate time and
Irish Standards
The current relevant Irish standards should be followed, including:
• ECTI
– National rules for electrical installations
• IS 813
– Domestic Gas Installations
Timber framed buildings
Where the appliance is to be fitted to a timber framed building the
guidelines laid down in BS5440: Part 1 and IGE "Gas Installations in
Timber Frame Buildings" should be adhered to.
Potable water
All seals, joints and compounds (including flux and solder) and
components used as part of the secondary domestic water system must
be approved by WRAS.
CH Water
Salt based artificially softened water must not be used to fill the central
heating system.
Worcester 2000 – 6 721 814 551 (2019/09)
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