What is a Heat-Only Boiler?
A heat-only boiler, also known as a regular or conventional boiler, is a traditional heating system ideal for homes with high hot water demand or multiple bathrooms. It uses a separate hot water cylinder and cold water storage tank, making it perfect for larger households or properties with older pipework already in place. One of its main advantages is the ability to supply hot water to multiple taps at the same time without a pressure drop.
Heat-only boilers are also compatible with solar thermal systems and can be easier to maintain due to their straightforward design. They’re particularly suited to properties already using a conventional setup, offering a reliable and cost-effective upgrade.
How Does a Heat-Only Boiler Work?
The system draws cold water from a tank in the loft, which is then heated by the boiler. This hot water is stored in a separate cylinder and distributed to taps, showers, and the heating system as needed. A separate pump controls the flow, allowing independent management of heating and hot water.
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Worcester Bosch Heat-Only Boilers
Worcester Bosch is one of the UK’s leading boiler brands, known for premium quality, energy efficiency, and excellent aftercare. With decades of experience, they are trusted by homeowners and heating engineers alike.
Greenstar Ri Regular Boiler
A compact, wall-mounted regular boiler available in 12 to 30 kW outputs, ideal for small to medium homes with a traditional heating system. It features user-friendly controls, low NOx emissions, and a 7-year warranty when installed by a Worcester Accredited Installer.
Greenstar 8000 Life Regular Boiler
Designed for larger homes, this boiler offers outputs up to 50 kW with excellent efficiency and quiet operation. It includes a sleek modern design, optional smart control integration, and a warranty of up to 12 years with accredited installation.
Greenstar FS CDi Regular
A floor-standing boiler perfect for homes with high heating demands or older systems. With outputs from 30 to 50 kW, it combines powerful performance with high efficiency and simple servicing, backed by up to a 10-year warranty.
Ideal Heat-Only Boilers
Ideal is a reputable and widely recognised boiler brand. The British manufacturer has over 100 years of experience, and is known for producing reliable, innovative boilers that offer excellent value for money.
Ideal Logic MAX Heat Boiler
A compact and highly efficient heat-only boiler available in 12 to 30 kW outputs. It features a high-quality brass system filter, full compatibility with smart controls, and a 10-year warranty when installed by a Max Accredited Installer.
Ideal Logic+ Heat Boiler
With outputs from 12 to 30 kW and a 94% efficiency rating, this model is a popular choice for traditional systems with separate cylinders. It’s compact, quiet (Quiet Mark approved), and comes with a 7-year warranty, extendable to 10 years.
Ideal Mexico HE Boiler
A floor-standing heat-only boiler designed for larger homes and systems where wall-mounted options aren't suitable. Available in 15 to 36 kW outputs, it offers robust performance, ease of service, and simple controls, backed by a 2-year warranty.
What Size Heat-Only Boiler Do I Need?
The size of the heat-only boiler you need depends on your home’s heating and hot water demand, the number of radiators, and how many bathrooms you have. Heat-only boilers are typically available in a range of outputs, usually from 12 kW to 30+ kW.
- 12-15 kW: A boiler of this size is typically suited to smaller homes or flats with up to 10 radiators and one bathroom.
- 15-24 kW: Ideal for medium-sized homes, this boiler can supply 10 to 15 radiators and one or two bathrooms.
- 25-30+ kW: This higher kW boiler is best for larger properties with multiple bathrooms and 15+ radiators, where hot water is needed at several outlets simultaneously.
How Much Does it Cost for a Heat-Only Boiler and Installation?
The cost of installing a heat-only (regular) boiler can vary based on your home’s setup, the size of the system, and the brand you choose. Heat-only boilers require a separate hot water cylinder and cold water tank, so installation tends to be more involved than with a combi system, especially if you’re switching from another boiler type.
As a general guide, replacing an existing heat-only boiler with a high-quality Worcester Bosch heat-only model, including professional installation and a 5-year guarantee, typically starts at £1,950.
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