A combi boiler is a type of heating system that provides both hot water and central heating from a single unit. It heats water directly from the mains supply, which means there is no need for a separate hot water tank. This makes it a space-saving option, ideal for smaller homes. Combi boilers are known for their efficiency and convenience. They can deliver hot water on demand, ensuring that you have a continuous supply without waiting for a tank to fill. This system is popular in many countries due to its compact design and lower energy costs.