“Rinnai’s system has transformed our energy consumption - dropping from 750 kWh a day to around 200 kWh.”
— Denbighshire Energy Team Manager
Cut your estates carbon today with an expert consultation with the Rinnai team.
Denbighshire County Council implemented Rinnai N Series Continuous Flow Water Heaters at the Cysgod Y Gaer Residential Home, achieving significant improvements in energy performance and operational efficiency. Following the installation, the site recorded a 73% reduction in daily fuel consumption, with hot water energy usage dropping from approximately 750 kWh per day to just 200 kWh. This upgrade not only delivered substantial cost savings but also enhanced overall system efficiency and lowered emissions. The new water heating solution provides a future‑proof, low‑NOx, high‑efficiency system that supports the council’s sustainability goals while ensuring reliable hot water supply for residents.
Client Introduction
Denbighshire County Council operates across one of the UK’s most scenic and culturally significant regions, including the Vale of Clwyd and historic St Asaph Cathedral. The council is committed to ambitious Net Zero goals and actively invests in improving the efficiency of its diverse public estate which includes schools through to care homes.
Problem
The Council’s Cysgod Y Gaer Residential Home required a more efficient and cost‑effective solution for delivering large volumes of hot water. The existing system relied on two hot water cylinders heated by the main boilers, resulting in high daily gas consumption, inefficient storage‑based heating and rising operational costs.
According to the Denbighshire Energy Team:
“We knew the cylinders were energy-intensive and weren’t aligned with our long-term efficiency goals.”
The challenge was to find a dependable, lower‑carbon and budget friendly alternative without compromising the care home’s continuous hot water demand.
Solution
After assessing available technologies, Denbighshire County Council selected Rinnai’s N Series continuous‑flow water heaters. The Rinnai system only heats water on demand and eliminates the inefficiency of stored hot water.
The Council chose Rinnai because of:
- Proven high efficiency (96%)
- 13:1 modulation ratio for precise energy use
- Stainless steel heat exchangers offering long service life.
- Low NOx emissions (<26 ppm) supporting environmental targets.
- Comprehensive design support from Rinnai’s technical team
The Energy Team removed the two traditional cylinders and installed Rinnai N Series units sized for the care home’s requirements.
As the Energy Team manager explained: “The Rinnai units were simple to integrate and immediately began reducing our gas usage.”
Results
The impact was immediate and substantial: 73% Reduction in Daily Fuel Use,
- Before: ~750 kWh/day
- After: ~200 kWh/day
- Verified through AMR gas consumption data
Key Benefits
- Major cost savings for the council
- Improved operational efficiency and reliability.
- Reduced carbon emissions and environmental impact
- Hot water supply matched precisely to demand.
- Future‑proof system compatible with low‑carbon fuels
The Energy Team added:
“The continuous‑flow system optimises every unit of energy. We are squeezing the maximum efficiency out of our hot water process.”
Conclusion
Denbighshire County Council’s adoption of Rinnai continuous‑flow water heaters demonstrates how public sector sites can dramatically cut energy use while improving service reliability.
“The project has exceeded expectations. We would recommend exploring continuous‑flow systems to any organisation looking to lower costs and support Net Zero goals.”
Organisations can access free design support and explore cost-saving opportunities tailored to their buildings. Speak to a Rinnai expert today.
