Issue 1 06/02/20
17
Before Installation
5
5 Before Installation
5.1 Installation Regulations
5.2 Installation Requirements
Warning
Installation of the appliance must be carried out by a
qualified engineer in accordance with prevailing and
national regulations as listed below.
• Building Regulations
• The Building Standards (Scotland)
• The Building Regulations (Northern Ireland)
• I.E.E Electrical Regs
• UK Water Regulations
5.2.1 Water supply
In an unvented system the pressure and flowrate is directly
related to the incoming water supply. For this reason it is
recommended that the maximum water demand is assessed
and the water supply checked to ensure this demand can be
satisfactorily met.
• We suggest the minimum supply requirements should be
0.15MPa (1.5 bar) pressure and 100 litres per minute flow
rate to ensure adequate discharge of hot water through the
T&P valve in the event of overheating.
• A 28mm cold water supply is recommended, however, if a
smaller supply exists, which provides sufficient flow, this
may be used (although more flow noise may be
experienced).
• The higher the available pressure and flow rate the
better the system performance.
• See Technical Data Table for cylinder operating pressures.
5.2.2 Outlet/terminal fittings (taps, etc.)
• The cylinder can be used with most types of terminal
fittings.
• Outlets situated higher than the cylinder will give outlet
pressures lower than that at the heater, a 10m height
difference will result in a 1 bar pressure reduction at the
outlet.
• All fittings, pipework and connections must have a rated
pressure of at least 8 bar at 80°C.
5.2.3 Limitations
The cylinder should not be used in association with any of the
following:
• Solid fuel heat sources or any other heat source in which the
energy input is not under effective thermostatic control,
unless additional and appropriate safety measures are
installed.
• Ascending spray type bidets or any other class 1 back
syphonage risk requiring that a type A air gap be employed.
