Waste Water Heat Recovery for Showers

London Plan 2019: Updated Carbon Emission Factors

What is the London plan?

The London Plan is the statutory Spatial Development Strategy for Greater London prepared by the Mayor of London in accordance with the Greater London Authority Act and associated regulations. The aim of the London Plan is to shape the way that London develops on all levels of infrastructure, buildings and transports over the next 20 to 25 years.

London plan Energy Calculation Revisions

In 2018, the Greater London Authority (GLA) announced revisions to the London Plan that affected how energy efficiency models (eg SAP and SBEM) are calculated.

London Plan now requires Energy Strategies to use the upcoming SAP 10 emission factors. This revision went live on 1st of January and the implications of changing the emission factors means a staggering shift away from CHP systems, with gas and solar PV being less effective and all electric heating and hot water systems, such as heat pumps, expected to dominate.
This presents a huge opportunity for WWHRS which can help bridge the compliance gap for developments reliant on CHP systems or enhance the energy strategy, design and cost of electric-based or heat pump systems.

London Plan - Updated Carbon Emission Factors

GLA policy states that a minimum 10 % of CO2 saving should be achieved through lean design:

WWHRS is an ideal measure to help achieve this

WWHRS with the London Plan

Particularly with the introduction of the energy calculation revision, the London Plan presents a huge opportunity for the integration of Waste Water Heat Recovery Systems (WWHRS). WWHRS is available to model directly into SAP, SBEM, or DSM models for new build residential or non-residential developments. The recent inclusion of WWHRS within iSBEM and IESve modelling software suites, has allowed for a straight-forward, drop-in approach to calculating the demand reduction capability of WWHRS on any given project. And as always, Recoup are here to guide you through any technical or design elements, to ensure the most cost-effective systems are used for your project.

WWHRS is an ideal energy efficiency measure for new-build housing, apartments, hotels and student accommodation builds. Showering can account for around 50% of a dwellings’ hot water usage, however, this can be significantly higher for hotels and student accommodation projects. WWHRS is capable of reducing the energy required to heat hot water for showers by up to 55%.

The current version of the London Plan requires an on-site carbon reduction target of 35% and already encourages developers to consider the energy hierarchy…

Be Lean – Reduce energy demand

Be Clean – Supply energy efficiently

Be Green – Use renewable energy

These steps dictate construction specifications, in some instances the development layouts and of course, the build cost.

WWHRS is one of the most cost-effective SAP measures available, and can be used to reduce primary energy demand, while also mitigating GLA Carbon Offset Payments

In many London Boroughs, specifying WWHRS is cheaper than paying Carbon Offset Payments

WWHRS helps achieve Cost-effective compliance

Relevant Products

Recoup WWHRS Pipe+ HE

Pipe+ HE

Recoup WWHRS Easyfit+


Recoup WWHRS Drain+ Range

Drain+ Range

Recoup WWHRS Tray+ DSS-S2

Tray+ DSS-S2

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