A system boiler is a type of heating system that provides hot water and heating for your home. Unlike traditional boilers, system boilers have built-in components, such as the pump and expansion vessel, which makes installation easier and more compact. They work by heating water directly from the mains supply, allowing for a constant flow of hot water to multiple taps or radiators at the same time. These boilers are ideal for homes with higher hot water demands, as they can supply hot water quickly without the need for a separate water tank. System boilers are also energy-efficient, helping to reduce energy bills while keeping your home warm and comfortable.