Main 25kW Combi Boiler with Horizontal Flue

The Main 25kW Combi Boiler with Horizontal Flue is a compact, high-efficiency combination boiler package designed to deliver reliable central heating and instant mains-pressure hot water for modern homes. Supplied with a horizontal flue kit, this complete package provides everything needed for a straightforward installation while offering dependable performance and excellent value for money.

Designed by Main Heating, part of the Baxi group, the Main Eco Compact 25 features a durable stainless steel heat exchanger, lightweight construction, and cupboard-fit dimensions. It is an ideal solution for apartments and small to medium-sized homes looking for efficient heating without the need for a separate hot water cylinder.

Key Features

• 25kW Combination (Combi) Gas Boiler
• Includes Horizontal Flue Kit
• Fuel Type: Natural Gas
• Instant mains-pressure hot water
• No hot water cylinder required
• ErP A Rated efficiency
• High-efficiency condensing technology
• Stainless steel heat exchanger
• Brass hydraulic components
• Compact cupboard-fit design
• Lightweight installation (29kg lift weight)
• Front-facing pressure gauge
• Compatible with Baxi OpenTherm RF controls
• 5-Year manufacturer's warranty (subject to terms)
• Designed and manufactured by Main Heating, part of the Baxi group

Ideal for Small to Medium Homes

The Main 25kW Combi Boiler is ideal for apartments, flats, and small to medium-sized homes with one bathroom. As a combi boiler, it provides both central heating and domestic hot water directly from the mains, eliminating the need for a separate hot water cylinder or cold water storage tank.

Its compact dimensions make it an excellent choice where installation space is limited, including kitchen cupboards and utility rooms.

Efficient Heating & Instant Hot Water

With a 25kW central heating output and a domestic hot water flow rate of up to 10.2 litres per minute (Δ35°C), the Main Eco Compact 25 delivers reliable everyday performance for showers, taps, and household heating.

Its modern condensing technology helps maximise efficiency while reducing energy consumption and household running costs.

Compact Design & Easy Installation

Designed with installers in mind, the Main Eco Compact 25 offers a lightweight, cupboard-fit design that simplifies handling and installation.

Dimensions

• Height: 700mm
• Width: 390mm
• Depth: 285mm

The included horizontal flue kit makes this package an ideal choice for quick and efficient installations.

Energy Efficient Performance

The Main Eco Compact 25 combines proven condensing technology with a high-quality stainless steel heat exchanger to provide reliable heating performance and excellent seasonal efficiency.

Its ErP A Rating helps homeowners reduce gas consumption while maintaining comfortable heating and hot water throughout the year.

Smart Heating Control Compatibility

The boiler is compatible with Baxi OpenTherm RF controls, allowing improved temperature management, enhanced comfort, and greater energy efficiency when paired with compatible thermostats.

Reliable Performance & Easy Maintenance

Built using durable components including a stainless steel heat exchanger and brass hydraulics, the Main Eco Compact 25 is engineered for long-term reliability.

Its front-facing pressure gauge and accessible internal layout make routine servicing and maintenance simple for heating engineers.

Warranty & Peace of Mind

The Main 25kW Combi Boiler includes a 5-year manufacturer's warranty (subject to registration and installation terms), providing confidence and long-term peace of mind for homeowners.

Why Choose the Main 25kW Combi Boiler with Horizontal Flue?

• Complete boiler and horizontal flue package
• Efficient 25kW combi boiler
• Compact cupboard-fit design
• Stainless steel heat exchanger
• Instant mains-pressure hot water
• 10.2 L/min hot water flow rate
• Lightweight installation
• OpenTherm compatible
• No hot water cylinder required
• 5-Year manufacturer's warranty