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Installation Instructions F10-60/170714
3.3. Requirements for Recognition within SAP Calculations
3.3.1. Dwelling Evaluation
3.3.2. Drainage Connections
The following dwelling requirements must be satisfied in order f
or the
WWHRS to be recognised in
SAP calculations:
•
Supply water pressure and flow rate must be sufficient to ensure satisfactory DHW
performance after installation of the Assure Horizontal SHRU.
•
•
The domestic hot water system (DHW) must be a mains pressure system;
If not installed
in System B configuration, the DHW heater must accept a
pre-heated water inlet (Max. 30°C).
•
The shower(s) must use a thermostatic mixing valves.
•
The Assure Horizontal SHRU must be installed within the dwelling heated envelope.
NOTE: Whilst the Assure Horizontal SHRU can be connected to
i
nstantaneous
electric
showers, such combinations are not recognised in SAP calculations.
The length of the drain pipe between the shower and the Assure Horizontal SHRU must be minimised,
preferably to less than 3 metres.
With reference to Approved Document – Part H (2002) of the Building Regulations, an appropriate
method for preventing the ingress of foul sewer gases as a result of the WWHRS installation must be
devised.
An a
eration valve is not required.
