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3. PRE-INSTALLATION REQUIREMENTS
3.1. Principle of Operation
The Assure Horizontal SHRU is a Waste Water Heat Recovery Unit (WWHRU).
The Assure Horizontal SHRU recovers the heat contained in the shower/bath drain water and transfers this heat
to the cold mains water prior to reaching the shower mixer tap and/or Domestic Hot Water heater (DHW). The
DHW heater could be a combination boiler, an unvented cylinder, a heat interface unit on a district heating
scheme* or a thermal store.*
(*) mains pressure DHW delivery
3.2. Installation Configuration
The Assure Horizontal SHRU must be located horizontally on a suitable base below the shower/bath, with the
desired separation.
The mains cold water is connected to the Assure Horizontal SHRU inlet and the preheated water from the Assure
Horizontal SHRU is connected in one of the following 3 configurations
System A: To the shower mixing valve (mains cold water) inlet and the DHW heater inlet. This will
provide the maximum amount of recovered energy.
System B: To the shower mixing valve (mains cold water) inlet ONLY. We recommend this
configuration if the connection to the DHW heater involves too much work or it is too far.
System C: To the DHW heater inlet ONLY.
SAP calculation recognises the performances of Systems A, B & C. System A will provide the highest
efficiencies (see section 2.3 for different system performances). Note kWh calculations are estimates
and are not calculated by SAP.
6 Installation Instructions F10-60/170714
gency KIWA Nederland B.V.
5
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