With a water supply from solid fuel boilers or any other boiler in which the energy input is not under
effective thermostatic control, unless additional, necessary and appropriate safety measures are
installed.
With gravity circulation primaries unless a good head of pressure is available.
With steam heating plant unless additional and appropriate safety devices are installed.
With ascending spray type bidets or any other facility where there is a Class 5 back siphoning risk
requiring that an appropriate air gap be employed.
With water supplies that have either inadequate pressure or where the supply may be intermittent.
In situations where it is not possible to pipe away any discharge from the safety valves safely.
In areas where the water contains a high proportion of solids, e.g. suspended matter that could block
the strainer, unless adequate filtration can be ensured.
Where another appliance in the room is vented by way of an open flu.
The installation must be carried out in accordance with the relevant requirements of:
A) The appropriate Building Regulations: either The Building Regulation (England and Wales), The
Building Regulations (Scotland) or Building Regulations (Northern Ireland).
B) The Water Fittings Regulations (England and Wales) or Water Bye laws (Scotland).
C) Any other applicable Regulations.
Failure to observe any of the above conditions will invalidate the warranty/guarantee.
4.5 Hot Water Air Source Heat Pump Package:
Where the unit is to be installed as an unvented system it will be supplied with the fittings needed to allow
installation to comply with G3 Regulations ā This means that the supply cost for the unvented
configuration unit will be higher than when installed as a vented system as additional fittings are required.
Where the unit is to be installed in a vented system, such fittings will not be necessary.
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