# Sewage Water Heaters French Eco Initiative Takes Energy From Hot Sewage to Heat Swimming Pools By Innospotter | Published 2010-02-07 | Eco Source: Trend Hunter, https://www.trendhunter.com/trends/sewage-water-heaters References: [treehugger](http://www.treehugger.com/files/2010/02/french-using-sewage-to-heat-their-swimming-pools.php) & [fastcompany](http://www.fastcompany.com/blog/ariel-schwartz/sustainability/french-town-heats-swimming-pool-sewage) A poo(l) party might not be appealing for most people, but after hearing about the [massive amount of energy](https://www.trendhunter.com/trends/pfas-removal-technology) stored in hot sewage water, the French town of Levallois-Perret decided to invest in technology in order to capture the wasted heat. Another bold greentech investment that sounds a lot worse than it is! In fact, sewage water and [pool water](https://www.trendhunter.com/trends/swim-jet) only exchange heat passively, not directly. Apparently, the sewers can cut [energy bills](https://www.trendhunter.com/trends/warmflow-messenger) in this town by around 24%! Maybe introducing a chili cooking contest will benefit the climate in a yummier fashion... ## Trend Insights (Trend Hunter) - Score: 1.4/10 - Popularity: 3% | Activity: 31% | Freshness: 8% - Audience gender: 50% men, 50% women - Primary generations: Millennial - Top markets: North America, Europe, Asia ## Categories [Trend Hunter](https://www.trendhunter.com/trends) > [Eco](https://www.trendhunter.com/eco) ## Key Themes ### Why This Trend Is Growing - **Sewage-heat Energy:** Exploring the potential of sewage heat energy to heat buildings and facilities - **Green-tech Investment:** Investing in green technology to reduce energy costs and promote sustainable practices - **Passive Heating Exchange:** Developing technology to utilize passive heating exchange between water sources ### Industries Being Reshaped - **Sustainable Energy:** Developing sustainable energy solutions from unconventional sources - **Construction:** Incorporating passive heating exchange technology in building designs - **Hospitality:** Using sewage heat energy to power hotel and resort facilities ## Related on Trend Hunter - [Heat Recovery Pasteurizer Systems](https://www.trendhunter.com/trends/integrated-heat-pump-system.md) - [Closed-Loop Bathing Systems](https://www.trendhunter.com/trends/upfall-shower.md) - [Pool Reinvention Campuses](https://www.trendhunter.com/trends/waltham-forest-college.md) - [Pool-Centric Temperature Control Systems](https://www.trendhunter.com/trends/temperature-control-system.md) - [Cooking Oil-Powered Heaters](https://www.trendhunter.com/trends/bio-heater.md) - [Solar-Powered Pool Sanitizers](https://www.trendhunter.com/trends/solar-pool-ionizer.md) - [Eco-Conscious Water Heaters](https://www.trendhunter.com/trends/ecoconscious-water-heaters.md) - [Battery-Ready E-Boilers](https://www.trendhunter.com/trends/bolt-e-boiler.md) - [Accessible Floating Public Pools](https://www.trendhunter.com/trends/floating-public-pool.md)