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Taps and Shower Fittings
a. Ensure that all terminal fittings are suitable for mains pressure in the range of 0.5
- 1.5 bar. Use aerated taps whenever possible to prevent splashing.
b. Any type of shower mixing valve can be used as long as both the hot and cold
supplies are mains fed. However, all mains pressure systems are subject to dynamic
changes particularly when other hot and cold taps/showers are opened and closed,
which will cause changes in the water temperature at mixed water outlets such
as showers. For this reason and because these are now no more expensive than
a manual shower we strongly recommend the use of thermostatic showers with
this appliance.
The shower head provided must also be suitable for mains pressure supplies.
If it is proposed to use a 'whole body' or similar shower with a number
of high flow/pressure outlets please discuss with the Gledhill technical
department.
c. Note that the shower fittings must comply with the backflow prevention
requirements (Para 15, Schedule 2) of the Water Supply Regulations.
d. A bidet can be supplied from the BoilerMate A-Class HP-DEM appliance as long as
it is of the over rim flushing type and incorporates a suitable air gap.
1.
2.
3.
4.
BoilerMate
2. All components must be suitable for use on domestic unvented hot water storage systems
Bronze circulator
Expansion Vessel
Hot water return pipework
Single check valve/non return valve - should be fitted
as close as possible to the appliance
Manual/auto
air vent
2
HP-DEM
1
4
SINK
Schematic diagram of typical secondary hot water circulation
1. Hot flow and return pipework must be insulated
Page 19
Dead Leg Volumes and Secondary Hot
Water Circulation
If the dead leg volume of the hot water draw-off
pipework is excessive and the delivery time for
hot water to be available at the tap is more than
60 seconds you may consider using:-
a. Trace heating such as the 'Raychem HWAT'
system. Please call Gledhill technical
department for further details.
OR
b. A secondary hot water circulation system as
shown schematically in figure 1.9.
SH
WHB
BATH
SCV
3
DESIGN
WHB
Figure 1.12
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