The Arceus ST electric boiler is designed for systems that use an external hot water storage cylinder. Unlike instantaneous models, it heats and maintains water in the cylinder at a set temperature, ensuring a steady and reliable hot water supply. A built-in 3-way valve automatically directs heat to the storage cylinder when temperatures drop below the desired level. Without the need for an internal plate heat exchanger, the ST model offers a simplified and efficient solution for homes with stored hot water systems. Equipped with smart modulation and OpenTherm technology, the boiler optimises energy usage while maintaining comfort.

Key Features :

• Designed for use with external hot water storage cylinders
• Range rateable output for improved efficiency
• Built-in smart modulator
• OpenTherm compatible (up to 15–20% energy savings)
• Economy / energy saving mode
• Frost protection
• 3 year Warranty