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Heating System
Pipe Sizing And Materials – Sealed And Open Vented Heating Systems
All the recommendations with regard to heating systems in this manual are generally
based n BS/EN Standard copper pipework and fi ttings. However we are happy that
plastic pipework system can be used in place of copper as long as long as the: -
• The chosen system is recommended for use in domestic heating systems
by the manufacturers and it is installed fully in accordance with their
recommendations.
• The design criterion of the plastic system is at least equivalent to the use of BS/En
Standard copper pipework and fi ttings.
• We always recommend the barrier pipe for these systems.
• The F & E cistern supplied with the thermal store can be fi tted remotely up to 6m
above the base of the BoilerMateBP i.e. the maximum static pressure in the store
must not exceed 0.6bar.
The primary pipework connecting the boiler, the thermal store and central heating
system should be sized to achieve either 11°C rise across the boiler or the maximum
temperature rise specifi ed by the boiler manufacturer; which ever is smaller. But in
any case should not be less than 22mm copper tube or equivalent.
The pressure loss through the primary heat exchanger is shown in fi gure 6 and this
can be used for sizing the pump and the primary pipe work.
Boiler Size
The minimum total boiler power required is the sum of the power required for space
heating which should be calculated in accordance with BS 5449 and the power
required for producing hot water which can be read from table below.
Minimum Boiler Power Required for Producing DHW
BoilerMate BP Model
BMBP 125
BMBP 145
BMBP 185
BMBP 215
BMBP 225
Y or S plan control
W plan control system
systems (without hot
water priority)
3
3
4
4
5
Page 13
(with hot water
priority)
0
0
0
0
0
DESIGN
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