Cordivari BOLLY 1 XL WB hot water boiler with 500 litre fixed heat exchangerCordivari BOLLY 1 XL WB hot water boiler with 500 litre fixed heat exchanger The Cordivari BOLLY 1 XL WB ACS boiler The 500 liter accumulator is designed for the production and storage of domestic hot water, integrating with solar and heat pump systems. The domestic hot water boiler is a storage tank capable of holding large quantities of water, maintaining it at the desired temperature. Producing domestic hot water for personal hygiene or domestic