Typical flue gas temperature under normal operating conditions are 200 - 250°C.
Maximum flue gas temperature typically 330°C (308K at maximum setting).
UNDER NO CIRCUMSTANCES SHOULD 90° BENDS BE USED IN THE FLUE SYSTEM
AIR SUPPLY
Detailed recommendations for air supply are given in the current Building Regulations J/1/2/3.
The following notes are intended to give general guidance:-
Kitchen or Internal Space Air Supply
Wherever a flued appliance is to be installed, it must have a permanent air vent. This vent must be either direct to
outside air or to an adjacent room or internal space which must itself have a permanent air vent of at least the
same size direct to outside air. The minimum effective area of the permanent air vent in the outside wall must be
30.5cm
2
(4.75in
2
).
Effect of Extractor Fan
Avoid if possible the installation of an extractor fan in the same room as the appliance or the room where the
permanent vent is located. Additional air inlets must be fitted to introduce compensating air, equivalent to the
capacity of the fan when fitted.
HOT WATER SYSTEM
Hot water systems should be in accordance with the relevant recommendations given in BS.6700.
The following notes are of particular importance:-
1. In domestic hot water systems the hot water storage vessel should preferably be of the indirect cylinder of
calorific type.
2. The hot water storage vessel should be insulated, preferably, with not less than 75mm thick mineral fibre,
or its equivalent.
3. Pipework should be insulated to help prevent heat loss and possible freezing, particularly where pipes are
run through roof spaces. Cisterns situated in area which may be exposed to freezing conditions should
also be insulated.
4. Draining taps must be located in accessible positions which permit the draining of the appliance and hot
water storage vessel. Draining taps should be at least
1/
2
in BSP nominal size and be in accordance with
BS.2879.
5. The appliance boiler section should be connected to a cistern water supply, subject to a maximum head of
18.25m (1.8 Bar).
6. Water carrying copper tubes should be to BS.2871, Part 1.
7. Hot water systems should be in accordance with the relevant recommendations given in BS.6700.
8. The use of horizontal pipe runs should be avoided wherever possible in order to prevent the collection of
air in the system. If horizontal runs are unavoidable the pipes should rise upwards in the direction away
from the appliance.
Hot Water Storage Vessel
It is recommended that an indirect 140 litre (30 gallon) hot water storage cylinder of the double feed type e.g.
Page 8 of 23
EINS 511985
26/10/2006
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