Vokera Synergy Combi Boilers The Vokera Synergy 25C is a combi boiler is a type of boiler that provides both central heating and hot water on demand from a single, compact unit. Unlike traditional boilers, a combi boiler doesn't require a separate hot water cylinder or cold-water storage tank. It heats water directly from the mains when a hot tap is turned on, providing an unlimited supply of hot water. Compact Design: The Vokera Synergy comes in a compact size, making them ideal for homes where space is limited. They can often be installed in kitchens or utility rooms. Controls: New digital touchpad control interface. Heat Exchanger: Stainless steel heat exchanger which is highly resistant to corrosion. Installation: Easy installation and maintenance for a certified heating engineer. Vokera Synergy 25C Combi Boiler