How to Choose the Right Boiler for Your Property Size July 21, 2025 Choosing the right boiler for your property isn’t just about the brand or price. The size of your home, number of occupants, and heating demands all play a role in determining the most efficient and reliable system. Picking a boiler that’s too small won’t meet your needs, while one that’s too large could waste energy and cost more to run. Here’s how to match the right boiler to your home. Matching boiler types to property sizes There are three main types of boilers to choose from, combi, system, and regular (conventional). Each has its advantages depending on your property layout and hot water requirements. Below is a breakdown of which boiler suits which home size best. Combi boilers: Ideal for small to medium homes Combi (combination) boilers heat water on demand and don’t require a separate hot water cylinder or cold water tank. They’re best suited for: Flats and smaller homes with 1–2 bathrooms Households with low to moderate hot water demand Properties where space is limited Combi boilers are compact, energy-efficient, and usually quicker to install. However, they may struggle if you want to run two showers at the same time. System boilers: Great for medium to large homes System boilers use a separate hot water cylinder but don’t need a cold water tank. They’re ideal for: Homes with 2+ bathrooms Families with high hot water usage Properties where multiple outlets may be used at once They take up more space than a combi but are excellent for maintaining consistent pressure across taps and showers. Regular boilers: Best for traditional setups or larger homes Regular boilers (also known as conventional or heat-only) are suited to homes with older heating systems or large hot water demand. They use both a hot water cylinder and a cold water storage tank, making them ideal for: Larger properties with multiple bathrooms Homes with older radiator systems Households already set up for this type of boiler They take up the most space but can cope with high demand when properly installed and maintained. Other factors to consider Number of radiators: More radiators require a higher output boiler Insulation levels: Well-insulated homes retain heat better, reducing required boiler size Future plans: If you’re extending your home or adding bathrooms, size up accordingly Smart controls and efficiency ratings: Modern boilers can adapt to demand and reduce energy use over time Consulting a professional installer is the best way to ensure the boiler you choose is sized accurately for your home’s heating and hot water needs. Need help choosing the right boiler in Aberdeen, Stonehaven or Westhill? Westhill Boiler Services offers expert advice and installations tailored to your property. Call us on 01224548803 or fill out our contact form to book a free boiler consultation.