This project involved the replacement of the existing Concord boilers in the plant room with two state-of-the-art Vaillant Ecotec 100kW boilers, configured in a cascade system for enhanced efficiency and performance. These new boilers were connected to a 240kW plate heat exchanger, with each boiler having a dedicated shunt pump to protect the new system from the older infrastructure, ensuring smooth operation.

The primary circuit was upgraded with a new expansion vessel, pressurisation unit, and dosing pot, while the existing dosing pot continued to serve the secondary circuit. Additionally, the entire flue system was replaced with a 316-grade stainless steel flue, which included a Ø150mm rigid condenser flue and an Ø180mm 16m flue liner, complete with all the necessary fittings for optimal performance.

For increased reliability, the secondary pump was upgraded to a Twin Head Grundfos circulating pump, featuring a duty/standby configuration. The control system was enhanced with a Vaillant wiring centre equipped with weather compensation capabilities, and new isolators were installed. Safety measures were strengthened with two thermal links to ensure the system operates safely and efficiently.

To further improve the system, all pipework was carefully insulated, and gas pipes were marked with yellow ochre paint for clear identification. Upon completion, the system underwent full commissioning, certification, and was handed over, ensuring that it met all necessary standards for operation and safety.