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Mains Cold
Pre-heated Mains
To Shower
System A
System B
System C
3.0
3.1
1. The Assure Shower Heat Recovery Unit (SHRU) is a waste water
heat recovery system (WWHRS) that recovers heat from the warm
waste water when taking a shower.
2. It relies on the waste water from the shower flowing through a
heat exchanger that pre-warms the mains cold water feed to a
shower mixing valve and instantaneous boiler or hot water
storage cylinder.
3. It is recommended that the pre-heated mains water from the unit
is connected to both the cold water supply of the shower mixing
valve and the combination boiler or hot water cylinder, as shown
(recommended System A configuration). System A configuration will
provide a balanced water flow and is the most efficient way to
recover the maximum amount of energy.
4. In case of an unbalanced water flow if, for example, only the cold
water supply to the shower mixer valve is pre-heated (System B
configuration) or the pre-heated mains water from the unit is only
connected to the combination boiler or hot water cylinder (System C
configuration), the efficiency of the SHRU will decrease by at
least 15%.
Fig. 2
System A (Fig. 2)
SHRU outlet connects to water heater inlet AND shower cold inlet.
System B (Fig. 3)
SHRU outlet connects to shower cold inlet ONLY
System C (Fig. 4)
SHRU outlet connects to water heater ONLY
5. Fig. 5 shows the SHRU serving two showers and being served by
the waste water from both. The example is a System A configuration.
Pipework between the SHRU preheated water outlet and water
heater and/or shower cold water inlet(s) (depending on
installation configuration, A, B or C) must be labelled to indicate
that no other services can be interconnected.
Note: It is eSSeNTIAl that a trap is installed downstream of the
SHRU and that NO trap is installed directly underneath the
Fig. 3
shower tray.
Fig. 4
Installation Preparation
System Principle
Fig. 5
5
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