--- title: WWHRS as part of passive design analysis for BREEAM credit Ene 04 description: WWHRS Hotel BREEAM Case Study --- [Skip to content](https://knowledge.recoup.co.uk/wwhrs-as-part-of-passive-design-analysis-for-breeam-credit-ene-04#main-content) English Show submenu for translations [![Recoup Logo HR\_50mm (RGB).jpg\]](https://knowledge.recoup.co.uk/hs-fs/hubfs/Recoup%20Logo%20HR_50mm%20(RGB).jpg?height=50&name=Recoup%20Logo%20HR_50mm%20(RGB).jpg)](https://recoup.co.uk/) - [Tickets](https://25105664.hs-sites-eu1.com/tickets-view) - [Sign out](https://25105664.hs-sites-eu1.com/_hcms/mem/logout) Open main navigation Close main navigation - [Tickets](https://25105664.hs-sites-eu1.com/tickets-view) - [Sign out](https://25105664.hs-sites-eu1.com/_hcms/mem/logout) - English Show submenu for translations - [Go to recoup.co.uk](http://recoup.co.uk/) [Go to recoup.co.uk](http://recoup.co.uk/) WWHRS, what would you like to know? - There are no suggestions because the search field is empty. 1. [WWHRS Knowledge Base](https://knowledge.recoup.co.uk/?hsLang=en) 2. [Case Studies](https://knowledge.recoup.co.uk/case-studies?hsLang=en) 3. [Non-Residential](https://knowledge.recoup.co.uk/case-studies?hsLang=en#non-residential) # WWHRS as part of passive design analysis for BREEAM credit Ene 04 ## WWHRS Hotel BREEAM Case Study Recoup have recently worked with a UK Low Carbon Consultant, who was undertaking a passive design analysis for a new build hotel, and looking to incorporate Waste Water Heat Recovery Systems ([WWHRS](https://recoupwwhrs.co.uk/wwhrs/)) for showers to help achieve a credit in Ene 04 for the [BREEAM](https://recoupwwhrs.co.uk/technical/breeam/) UK New Construction 2014 scheme. ### **BREEAM for New-build** For anyone who doesn’t know, [BREEAM](https://recoupwwhrs.co.uk/technical/breeam/) is the longest-established and most widely used 3rd party certification scheme, designed by BRE to drive innovation and standards above the regulatory minimum. Most modern [BREEAM](https://recoupwwhrs.co.uk/technical/breeam/) projects are typically designed to achieve ‘Very Good’ and ‘Excellent’ ratings, although increasingly more new-build designs are aspiring to the challenge of achieving the [BREEAM](https://recoupwwhrs.co.uk/technical/breeam/) ‘Outstanding’ rating.   ![BREEAM-Environmental-Stanadards](https://knowledge.recoup.co.uk/hs-fs/hubfs/Imported%20images/BREEAM-Environmental-Stanadards.png?width=615&height=506&name=BREEAM-Environmental-Stanadards.png)   The [BREEAM](https://recoupwwhrs.co.uk/technical/breeam/) assessment process is comprised of two stages: The Design Stage (interim) and the Post-Construction Stage (Final), and within these stages, there are a number of assessment sections. The Energy Section aims to encourage the design and operation of energy efficiency buildings, driving energy efficiency, and sustainable energy use; and ultimately reducing CO2 emissions. For projects where there is to be significant shower use, such as residential developments or apartments; hotels or student accommodation; or sports and leisure facilities, [WWHRS](https://recoupwwhrs.co.uk/wwhrs/) can contribute towards [BREEAM](https://recoupwwhrs.co.uk/technical/breeam/) credits within the Energy section, and in particular, credits for ENE04: Low or Zero Carbon technologies (LZC), where: a ‘meaningful reduction in regulated carbon dioxide’ must be demonstrated to contribute towards a [BREEAM](https://recoupwwhrs.co.uk/technical/breeam/) credit, and while the amount of energy or CO2 emissions reduction is not specified (in Ene 04), it should not be a trivial amount. As a guide, the installation should contribute at least 5% of overall building energy demand and/or CO2 emissions. Unlike the Ene 01 – *Reduction of energy use and carbon emissions* (which is focused on demonstrable and robust performance improvement), Ene 04 – *Low carbon design* aims to encourage project teams to consider a particular design approach to minimise the reliance on active building services systems.   ![Ene-04-Low-and-zero-carbon-feasibility-study](https://knowledge.recoup.co.uk/hs-fs/hubfs/Imported%20images/Ene-04-Low-and-zero-carbon-feasibility-study.png?width=644&height=296&name=Ene-04-Low-and-zero-carbon-feasibility-study.png) ### **LZC Feasibility Modelling of WWHRS for a Hotel Design, Ene 04 Credit.** The hotel design we assessed, has 160no bedrooms all with en suite shower facilities. The guest bedrooms are over five floors (2-6) and the floor plan on each level is essentially the same layout. Service risers are located, in most cases, between adjoining bathroom pods. In order to initially quantify the savings that could be achieved by utilising [WWHRS](https://recoupwwhrs.co.uk/wwhrs/), Recoup made an assessment of the supplied floor plans, and modelled a number of [WWHRS](https://recoupwwhrs.co.uk/wwhrs/) scenarios. Following some discussion with the Energy Assessor, we then produced an energy savings calculation model for an agreed [WWHRS](https://recoupwwhrs.co.uk/wwhrs/) design, that utilised agreed assumptions based on the building type and the DHW load. The overall energy consumption was calculated from the dynamic simulation model utilising the National Calculation Methodology (NCM) for the specific building usage profile ([see more information here](https://recoupwwhrs.co.uk/energy-initiatives/the-efficiency-of-a-waste-water-heat-recovery-system-for-sbem-calculation/)). ![Savings-due-to-WWHRS](https://knowledge.recoup.co.uk/hs-fs/hubfs/Imported%20images/Savings-due-to-WWHRS.png?width=688&height=151&name=Savings-due-to-WWHRS.png) As you can see from the table above, the saving due to [WWHRS](https://recoupwwhrs.co.uk/wwhrs/) is calculated to be 22.81 tCO2 pa. This represents a combined saving of 40% across all showers (a mix of vertical and horizontal [WWHRS](https://recoupwwhrs.co.uk/wwhrs/) units installed as System B). Importantly, in the case of this [BREEAM](https://recoupwwhrs.co.uk/technical/breeam/) assessment, 22.81 tCO2 contributed to \>5% savings against the baseline CO2 emissions for the building as designed, which qualified for a credit under the Ene 04 [BREEAM](https://recoupwwhrs.co.uk/technical/breeam/) issue. - [The Basics](https://knowledge.recoup.co.uk/the-basics?hsLang=en) - [Modelling](https://knowledge.recoup.co.uk/modelling?hsLang=en) - [Technical Specifications](https://knowledge.recoup.co.uk/technical-specifications?hsLang=en) - [Systems & Installation](https://knowledge.recoup.co.uk/systems-installation?hsLang=en#main-content) - [General](https://knowledge.recoup.co.uk/systems-installation?hsLang=en#general) - [Pipe HEX](https://knowledge.recoup.co.uk/systems-installation?hsLang=en#pipe-hex) - [Easyfit+](https://knowledge.recoup.co.uk/systems-installation?hsLang=en#easyfit) - [Drain+ Duo/HE/Compact](https://knowledge.recoup.co.uk/systems-installation?hsLang=en#drain-duo-he-compact) - [Case Studies](https://knowledge.recoup.co.uk/case-studies?hsLang=en#main-content) - [Residential](https://knowledge.recoup.co.uk/case-studies?hsLang=en#residential) - [Non-Residential](https://knowledge.recoup.co.uk/case-studies?hsLang=en#non-residential) - [Contacts, Supply & Sustainability](https://knowledge.recoup.co.uk/contacts-supply-sustainability?hsLang=en#main-content) - [Contacts and Supply](https://knowledge.recoup.co.uk/contacts-supply-sustainability?hsLang=en#contacts-and-supply) - [Sustainability](https://knowledge.recoup.co.uk/contacts-supply-sustainability?hsLang=en#sustainability) [![Chill listening crop-3](https://knowledge.recoup.co.uk/hs-fs/hubfs/Recoup%20Logo%20Email%20(RGB).png?width=107&height=24&name=Recoup%20Logo%20Email%20(RGB).png "Chill listening crop-3")](http://recoup.co.uk) Recoup Energy Solutions Ltd Copyright © 2026, Recoup Energy Solutions Ltd