www.heatingandventilating.net
Reducing fuel poverty and improving
housing performance
As social housing providers respond to the Government’s Warm Homes Plan and increasing pressure to improve the energy performance of housing stock, Steve Parker, head of social housing at Showersave, explains how wastewater heat recovery (WWHR) is helping housing associations reduce tenant energy bills, strengthen asset performance and de-risk the adoption of low-carbon heating systems such as air source heat pumps.
Right: Steve Parker, head of social housing at Showersave
SOCIAL HOUSING
the output of up to 2.5 solar panels while working alongside existing boilers and low-carbon heating systems. This enables immediate reductions in hot water energy demand and gas consumption, making it an effective solution for housing providers taking a phased approach to decarbonisation. This becomes especially relevant in relation to heat pump deployment. While ASHPs are central to decarbonisation strategies, they represent a significant investment, and their performance can be undermined when residents operate them in the same way as traditional boilers. By reducing hot water demand at source, WWHR helps de-risk heat pump systems, reducing cylinder recovery times and reliance on immersion heaters. It also supports system design, helping to optimise cylinder sizing and improve recovery times. This ensures adequate hot water availability during peak demand periods, including higher- occupancy use such as consecutive showers, while improving overall system balance. For housing associations, simplicity is a major
advantage. Showersave contains no moving parts, requires little or no maintenance, and delivers savings throughout the lifetime of the property. This low-maintenance profile supports asset managers focused on lifecycle cost, reliability and long-term performance.
The technology can also be integrated into a wide
range of delivery programmes, including kitchen and bathroom refurbishments, planned maintenance cycles, void upgrades and new affordable housing developments. This flexibility allows providers to embed efficiency improvements within existing investment plans, minimising disruption. Alongside cost savings, WWHR delivers meaningful
W
hile the sector is focused on large-scale retrofit delivery and heat decarbonisation, it is significant that WWHR is included
within the Government’s notional dwelling specification for the Future Homes Standard (FHS). This inclusion by DESNZ and MHCLG reflects its proven ability to reduce regulated energy demand and improve SAP performance, establishing WWHR as a recognised component of energy-efficient housing design. For housing associations, the challenge is no longer just carbon reduction but delivering measurable, affordable outcomes at scale. At the same time, the rollout of air source heat pumps (ASHPs) has highlighted a persistent issue: real-world performance is often influenced by resident behaviour. This has increased demand for technologies that can deliver energy savings while fitting seamlessly into residents’ daily lives. WWHR directly addresses this. Showersave
systems, for example, recover heat from shower wastewater and use it to pre-heat incoming cold water before it reaches the hot water system. This reduces the energy required for hot water production every time a shower is used, delivering automatic savings without any need for resident interaction. In practice, this can reduce hot water energy
consumption by up to 47 percent, saving households more than £200 per year. These savings are consistent, measurable and scalable across housing portfolios, making the technology attractive where landlords are under pressure to demonstrate both financial and carbon performance. A key advantage is that WWHR works every time
a shower is used. Unlike technologies affected by seasonal variation or resident behaviour, it delivers predictable year-round performance. Every shower becomes a recovery opportunity, capturing energy that would otherwise be lost. Just as importantly, there is no behavioural change required. This is increasingly critical for housing providers, as many retrofit technologies rely on residents adapting their heating habits to achieve the expected outcomes. Showersave removes that dependency entirely, ensuring performance is not compromised by resident behaviour. By recovering heat from shower wastewater, this system can deliver energy savings comparable to
carbon reductions. A single unit can save around five tonnes of carbon over its lifetime, while also improving SAP ratings and EPC outcomes. This supports wider decarbonisation goals and helps strengthen the overall performance of housing stock. From a compliance perspective, systems are designed to meet relevant UK standards, including BS EN 1717 requirements for fluid category protection and Regulation 4 approval under the Water Supply (Water Fittings) Regulations 1999. They are also WRAS approved and undergo rigorous testing through the KIWA UK Regulation 4 Product Approval Scheme (KUKreg4), providing assurance to specifiers and asset managers that they comply with UK water supply regulations. Because WWHR reduces the volume of hot
water required for showering, it can also support smaller cylinder sizing, reducing material use and installation costs while improving integration with other low-carbon technologies. This contributes to future-proofing housing stock and improving design efficiency. Ultimately, as housing associations balance
decarbonisation with affordability and asset performance, demand-reduction technologies are becoming increasingly important. WWHR offers a simple, passive solution that reduces hot water energy demand, improves heat pump performance and delivers measurable savings with no behavioural change required.
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