Eco news: What is a wastewater heat recovery system?

Reclaiming heat, reducing waste.

Homeowners are increasingly looking for ways to make their homes greener while reducing energy use. One clever solution is the Wastewater Heat Recovery (WWHR) system. This technology captures heat from the water you’ve already used, such as from showers, baths, dishwashers, or washing machines, and recycles it to pre-warm incoming cold water.

Instead of losing valuable heat down the drain, these systems can recover a significant proportion of that energy, helping reduce both your household running costs and your carbon footprint.

How does it work?

• A heat exchanger is installed within the wastewater outlet.
• As warm water flows away, it transfers heat to the cold-water supply running through the exchanger.
• The preheated water then requires less energy to bring up to temperature, making your heating system more efficient.

Shower installations are particularly effective, as the outgoing and incoming flows happen simultaneously. For baths, washing machines and dishwashers, storage-based systems can be used, which hold the warm wastewater temporarily before transferring its heat.

Benefits of WWHR systems

• Lower energy consumption – less energy is required to heat incoming water.
• Smaller carbon footprint – reducing wasted energy contributes to a greener home.
• No maintenance – once fitted, systems are designed to run without ongoing upkeep.
• Future-ready – a smart addition if you’re upgrading to renewable heating or aiming for higher energy efficiency standards.

Is it right for my project?

WWHR systems are easiest to install during new builds, extensions, or major refurbishments, where plumbing layouts can be designed with them in mind. Retrofitting into existing bathrooms or kitchens can be more complex, but it’s sometimes possible depending on space and layout.

While savings will vary depending on how much hot water your household uses, the environmental impact is immediate: less wasted energy, greater efficiency, and a step towards a more sustainable home.

At Acre Design, we’re passionate about integrating innovative, sustainable technologies into our projects across Newcastle, Northumberland and North Tyneside. If you’re planning an extension or renovation, we’d love to help you explore how WWHR systems, and other eco upgrades, could work in your home.

Book your Ask the Expert Call today and let’s start planning your future-ready home.

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