During our home surveys we sometimes just ask questions like, what are the differences between the different domestic boilers? What is a combi boiler and do I still need a tank in my loft? We want to make room in our airing cupboard, what boiler do we need to get rid of the hot water tank in the airing cupboard?
So we wrote a little blog to hopefully answer these questions but if you still need further assistance please don't hesitate to contact us at info@tdpheating.co.uk
Combi Boiler:
A combi boiler, short for combination boiler, is a compact and efficient unit that provides both hot water for taps and central heating. It doesn't require a separate water storage tank or cylinder because it heats water directly from the mains supply when you turn on a tap or a heating device. Combi boilers are popular in small to medium-sized homes where space is limited. They offer instant hot water and can be more energy-efficient since they only heat water on demand. However, the water pressure may be affected if multiple taps or showers are used simultaneously.
System Boiler:
A system boiler, also known as a sealed system boiler, is a heating system that incorporates a boiler, an expansion vessel, and a separate hot water storage cylinder. The boiler heats water that circulates through the central heating system and is then stored in the cylinder for later use. This type of cylinder tends to be an unvented cylinder (we will write another blog soon explaining what this is). System boilers are suitable for larger homes with higher hot water demands. System boilers are often considered more convenient than heat-only boilers since they eliminate one of the cold water tanks in the loft.
Heat Only Boiler:
A heat-only boiler, also referred to as a regular or conventional boiler, is the traditional type of boiler system. It requires both a hot water cylinder and a cold water storage tank. The cold water tank supplies water to the boiler, which heats the water and circulates it through the central heating system. The hot water cylinder stores heated water for domestic use. Heat-only boilers are suitable for larger properties with high hot water demand and where there is sufficient space for the tanks. They can work well in older heating systems and provide consistent water pressure.
In summary, the main differences between these boiler types are:
- Combi boilers provide hot water on demand without the need for separate tanks, making them space-saving and efficient. They are suitable for smaller homes.
- System boilers incorporate a separate hot water cylinder but don't require a cold water storage tank. They can supply hot water to multiple outlets simultaneously with an Unvented cylinder
- Heat-only boilers require both a hot water cylinder and a cold water storage tank. They are suitable for larger properties and older heating systems.
