Passively Recovering Waste Heat Energy With Every Shower

Recoup Drain+ Duo

The Recoup Drain+ Duo is the lower efficiency version of the Drain+ Duo HE that requires a shallower installation depth. A slimline wet-room drain horizontal Waste Water Heat Recovery system for Showers (WWHRS) providing efficiency of up to 52%. Comprising a double-walled heat exchanger with no moving parts, no exchanger maintenance or end-user interaction.

Ideal for residential self-build and renovation projects, leisure clubs, gyms, nursing homes, holiday parks, hotels, student accommodation, ground floor or any walk-in shower installations. This WWHRS is available with either the contemporary brushed stainless steel ‘Quadratto’ cover plate, or the minimalistic ‘in-line’ tile cover plate.

Features and benefits

  • Horizontal WWHRS – integrated shower drain for wet-rooms
  • Patented, double-walled heat exchanger
  • KIWA validated efficiencies of up to 42%, dependant on flow rate
  • In-line tile or Quadratto cover plate options
  • Built-in shower trap
  • Legionella control risk assessed
  • Option of 3 system installation variations
  • High quality manufacture
  • Virtually maintenance free
  • SAP listed

Product application

Bungalows or ground floor, Apartments, Commercial properties Product Application

Product diagram

Recoup WWHRS Drain+ Duo Diagram

Data & Specification

Specification details

Description Value Unit
Minimum depth for installation 140 mm
Overall width for installation 866 mm
Material – Heat exchanger Copper
Shower flow rate 5 – 12.5 litres/min
Max. Mains water inlet pressure 10 bar
Min. Mains water inlet pressure 1 bar
Max. Waste water working temp 85 °C
Mains water connection ½” male BSP
Waste water connection 40 – 43 mm
Weight (Boxed) 15 kg
Water volume – mains water 0.71 litres

Performance & efficiency

Shower Flow Rate @ 40°C ( litres/min )

dRAIN+ DUO efficiency ( Recovered energy kWh )

System A System B System C
5.8 41.9% (5.09)
9.2 41.6% (8.01)
11.0 40.4% (9.30) 32.9% (7.57) 36.6% (8.43)
12.5 39.7%(10.39)

Pressure drop on mains water circuit

Shower Flow Rate @ 40°C (litres/min)

dRAIN+ DUO Pressure drop ( bar )

System A System B System C
5.8 0.07 0.04 0.03
9.2 0.17 0.11 0.07
12.5 0.27 0.17 0.11

Technical information and downloads

Recoup Drain+ Duo & In-line tile cover plate (+55mm Syphon) drawingRecoup Drain+ Duo & In-line tile cover plate (+55mm Syphon) drawing

Recoup Drain+ Duo & In-line tile cover plate (+55mm Syphon) drawing document.

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Recoup Drain+ Duo & Quadratto cover plate (+55mm Syphon) DrawingRecoup Drain+ Duo & Quadratto cover plate (+55mm Syphon) Drawing

Recoup Drain+ Duo & Quadratto cover plate (+55mm Syphon) drawing document.

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Recoup Drain+ Duo installation and dataRecoup Drain+ Duo installation and data

Guide to the installation, product details, performance and operation of the Recoup Drain+ Duo product.

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Recoup WWHRS brochure

Recoup WWHRS BrochureRecoup's Waste Water Heat Recovery System (WWHRS) Brochure and Portfolio to download, save, print or share. Provides background information on WWHRS and why to use it, SAP assessment, SBEM, BREEAM, Passive House, all product options, features, benefits, installation methods and links to additional useful information.
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