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Last updated: 4th April, 2024


Baxi Megaflo Compact System - Boiler Review

Baxi Megaflo Compact System - Boiler Review

Key takeaways

  • The Baxi Megaflo is built to efficiently meet high hot water demands.
  • It offers a user-friendly experience and is designed for durability.
  • The system is highly efficient with a commendable heat output.

The Baxi Megaflo Compact System boiler is a high-efficiency heating solution, designed with space-saving in mind. Its compact design allows for installation within a standard kitchen cupboard, highlighting its suitability for a variety of property sizes.

System boilers are a crucial component in a household's heating infrastructure, especially in homes that experience higher demands for hot water. The Baxi Megaflo Compact System Boiler is designed to meet this demand efficiently. 

With its brass internal components, the Baxi Megaflo not only promises durability but also comes with the reliability of a well-known brand in the heating industry. This boiler is a popular option amongst homeowners who require a continuous supply of hot water to multiple outlets simultaneously.

One of the key attractions of the Baxi Megaflo is its simplicity in usage, making it an ideal choice for a wide range of users. It offers the convenience of a pre-heated water cylinder, which significantly reduces the wait time for hot water. 

In addition, the boiler is praised for its efficiency and ability to deliver up to 25.8kW of heat output, which is quite considerable for a compact system. While Baxi as a brand offers various models, the Megaflo System Boiler stands out for homes with high hot water demand, balancing performance with efficiency.

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Key Takeaways

  • The Baxi Megaflo is built to efficiently meet high hot water demands.^

  • It offers a user-friendly experience and is designed for durability.^

  • The system is highly efficient with a commendable heat output.

Overview of Baxi Megaflo Compact System

The Baxi Megaflo Compact System boiler is a high-efficiency heating solution, designed with space-saving in mind. Its compact design allows for installation within a standard kitchen cupboard, highlighting its suitability for a variety of property sizes.

Key Specifications:

  • Efficiency: A-rated for heating

  • Design: Compact cupboard fit

  • Installation: Flexible options with a range of compatible flues

Manufactured in the UK, the Baxi Megaflo boasts quality craftsmanship and reliability. It features high-quality brass components, underlining Baxi's commitment to durability. Furthermore, the presence of a large LCD display provides users with an easy-to-navigate manual control system.

Engineered to meet the demands for hot water in medium to large homes, this boiler pairs seamlessly with Megaflo Eco Cylinders. This system can service multiple outlets simultaneously, unlike combi boilers, which are typically suited for lower water demands.

Safety is a core consideration of the Baxi design philosophy. Certain models, such as the Baxi 800 and Baxi 600, are equipped with features that ensure safe operation by a wide demographic, including those with reduced physical capabilities, when appropriately instructed.

Key Features

The Baxi Megaflo system boiler has been engineered to meet the demands of modern homes, focusing on efficiency and hot water delivery.

Megaflo Eco Cylinder

It is designed to work in seamless unison with the Megaflo Eco Cylinder. This partnership ensures homes benefit from a consistent supply of hot water, which is particularly advantageous in households that have a higher than average hot water usage.

Stainless Steel Heat Exchanger

A core component is the stainless steel heat exchanger, offering significant durability and corrosion resistance, which contributes to the system's longevity. Its high-quality construction facilitates efficient heat transfer, aligning with the boiler's promise of performance.

High Demand for Hot Water

Engineered to address environments where hot water demands are taxing, the Baxi Megaflo keeps up without pause. Multiple water outlets, like showers and taps, can comfortably be serviced simultaneously, avoiding the inconvenience of fluctuating water temperatures.

Dimensions and Installation

Compact in design, the boiler's slim profile allows it to be comfortably installed inside a 290mm deep cupboard, ensuring it doesn't impose on interior space. Its tidy size does not compromise its capabilities, suiting a variety of property sizes and satisfying the practical requirements of installation.

Performance and Efficiency

In the realm of system boilers, the Baxi Megaflo System Boiler stands out for its compatibility with central heating systems and its impressive energy efficiency. Its advanced heat exchanger technology plays a pivotal role in enhancing its overall performance.

Heating System Compatibility

The Baxi Megaflo System Boiler is designed to seamlessly integrate with modern central heating systems. Equipped with high-quality brass components, this boiler is suitable for homes with a significant demand for hot water. It efficiently operates with a range of flues, broadening installation possibilities.

  • Central Heating System: Seamless integration with existing setups.

  • Installation Flexibility: Adaptable with various flue options.

Energy Efficiency Ratings

When assessing a boiler's performance, the Efficiency ratings are a fundamental indicator of its prowess. The Baxi Megaflo System Boiler boasts an A-Rated energy efficiency, ensuring consumers minimise their carbon footprint while reducing utility bills.

  • Efficiency: A-Rated, maximising energy utilisation.

  • Environment: Lower carbon emissions for eco-conscious households.

Heat Exchanger Technology

At the heart of the Baxi Megaflo's efficiency is its advanced heat exchanger. This component is essential for transferring heat from the burner to the water circulating within the central heating system, doing so with minimal energy loss.

  • Heat Exchanger: Uses high-grade materials for durability and efficiency.

  • Consistent Performance: Maintains optimal heat transfer throughout its lifespan.

With a combination of high-calibre parts, efficient operation, and cutting-edge technology, the Baxi Megaflo System Boiler offers a dependable solution for heating homes.

How System Boilers Work

A system boiler operates by directly heating a central heating system and producing hot water for a storage cylinder. It differs from a combi boiler, which heats water instantaneously without the need for a cylinder. Listed below are the key components and functions within a system boiler's operation:

  • Boiler Unit: At the heart of the system, the boiler unit burns fuel and heats water. Through a heat exchanger, it transfers the generated heat to the water circulating in the system.

  • Hot Water Cylinder: Often an insulated tank, like the Megaflo Eco, stores hot water to maintain a constant supply for taps and showers.

  • Heat Exchanger: A coiled pipe within the cylinder allows the heated water from the boiler to raise the temperature of the water in the cylinder.

  • Control Mechanisms: They are integral to the system, managing the timing and temperature of the heating and hot water.

  • Pump: Vital for system boiler operations, it ensures the circulation of hot water through the heating system.

Regular components in a system boiler configuration include:

  1. Expansion vessel

  2. Pressure relief valve

  3. Safety devices

  4. Thermostat and programmer

The installation of a system boiler includes a network of pipes connected to the radiators and taps, which facilitates a seamless supply of heating and hot water. In this sense, system boilers are particularly suited for homes with multiple bathrooms or increased hot water demand, providing a steady, reliable source of hot water. They are also more space-efficient than traditional boilers with separate hot water tanks but do require sufficient space for the cylinder.

User Experience and Operation

In evaluating the Baxi Megaflo Compact System boiler, user experience hinges on the intuitive control interface and the economic operation of the system. Attention to system features that enhance user interaction and manage running costs are paramount.

Control and User Interface

The Baxi Megaflo system boiler is equipped with a straightforward control panel designed for ease of use. Users can adjust heating and hot water settings without unnecessary complexity. The interface typically includes clear temperature controls and status indicators, which ensure users can maintain their desired level of comfort with minimal effort.

Running Costs and Heating Bills

A pivotal factor in the user experience with the Baxi Megaflo Compact System boiler involves its impact on heating bills. Featuring high energy efficiency, this boiler can contribute to reduced energy consumption, leading to potential savings on bills. The exact figures for savings will vary depending on individual household usage and the efficiency of their central heating system.

System Operation Features

The Baxi Megaflo incorporates features such as a built-in pump overrun and expansion vessel, which contribute to its reliable performance in maintaining central heating and water pressure. These operational characteristics not only optimise comfort but also ensure the longevity and efficiency of the boiler. Users will find that even in areas with low water pressure, the system delivers consistent performance.

Comparisons and Alternatives

Choosing a boiler can be a complex decision, requiring a comparison across different models, manufacturers, and boiler types. This section offers a brief overview of how the Baxi Megaflo Compact System Boiler stands in relation to other options in the market.

Other Baxi Models

Baxi offers a variety of boilers to suit different household needs. The Baxi Megaflo is part of this lineup, often preferred for its ability to handle high hot water demand and fit within a compact space, such as a 290mm deep cupboard. Another popular option from Baxi is the Platinum model, which is known for its reliability and higher output range.

Competing Manufacturers

  • Worcester Bosch: Known for their premium boilers, Worcester Bosch models are often compared with Baxi. They offer high efficiency and innovative features but can come at a higher price point.

  • Viessmann: These boilers are well-regarded for their advanced technology and long-term performance. Viessmann's Vitodens range is particularly popular in the UK for its efficiency and durability.

  • Vaillant: Vaillant boilers, like the ecoTEC range, are noted for their eco-friendly options and German engineering, providing a reliable alternative to Baxi.

Combi vs System Boilers

  • Combi Boilers: Compact and suited to smaller homes without a need for a separate hot water cylinder. Baxi and other manufacturers like Vaillant offer combi models that provide hot water on demand efficiently.

  • System Boilers: Like the Baxi Megaflo, these work with a separate cylinder. They're ideal for homes with higher hot water usage, ensuring a steady supply even when multiple taps are in use. Worcester Bosch and Viessmann provide competitive system boilers with comparable features.

System Boilers vs Heat-Only Boilers

  • System Boilers: They have an unvented hot water cylinder and are often more efficient than heat-only boilers. Baxi’s Megaflo is designed to work with the high capacity Megaflo cylinders, making it a powerful choice for households with substantial hot water needs.

  • Heat-only Boilers: Also known as conventional or regular boilers, these require a cold water tank and a hot water cylinder. While less suited for high-demand homes, brands like Vaillant and Viessmann offer models that excel in efficiency for homes with traditional heating systems.

New Boiler Costs

Boilers can be a daunting purchase for many people as they’re an appliance with a lot of responsibility, providing heat for you and your family is something you want to get right. Boilers aren’t exactly a quickly disposable item either, potentially lasting you a decade.

Boiler costs can be split into two segments: the first is the actual boiler itself (unit price), and the second is the cost of the boiler being installed (set up) in your property by an expert engineer. 

Here at iHeat, we want to remove all of this undue stress and make the decision making process of upgrading to a new central heating system, as easy as possible.

Boiler costs can vary depending on a number of factors including their brand, model, fuel, output, warranty, labour and installation type. Typically a new boiler will cost between £1,845 and £3,500, below is a list of average boiler installations offered by iHeat (guide only).

Installation Type

Price (inc VAT)

Combi to combi swap


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System to combi conversion


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New boiler install


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Back boiler to a combi


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System to system


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Frequently Asked Questions

What is the water pressure for a Baxi Megaflo Compact?

The Baxi Megaflo Compact typically operates well at a minimum water pressure of 1.5 bar. However, for optimal performance, a pressure closer to 3 bar is desirable.

What type of boiler is a Baxi Megaflo?

A Baxi Megaflo is a system boiler, designed to work in conjunction with a hot water cylinder. It is efficient for homes with higher hot water demand, commonly pre-heating water for usage.

How efficient is the Baxi Megaflo 32 system boiler?

The Baxi Megaflo 32 system boiler boasts an A-rated energy efficiency, meaning it converts upwards of 90% fuel into heat, reducing waste and energy costs.

What is the life expectancy of a Megaflo?

A Megaflo system boiler, with proper maintenance, can last between 10 to 15 years, sometimes even longer. Regular servicing ensures optimal performance over its lifespan.

Should I leave my Megaflow on all the time?

It is not necessary to leave a Megaflo system constantly on. They are designed to heat water as needed, and maintaining them on continuously may lead to unnecessary energy consumption.

How does Megaflo work with a combi boiler?

A Megaflo is not typically used with a combi boiler. Combi boilers provide hot water on demand without the need for a cylinder, while Megaflo systems are used with system boilers, which do require a cylinder.

Does Megaflo increase water pressure?

A Megaflo does not inherently increase water pressure; it maintains pressure at a steady level. It is the incoming mains pressure that determines the output pressure from taps and showers.

Stephen Day profile photo
Article by
Stephen Day | Co-founder
Gas Safe registered and FGAS certified engineer with over 20 years experience in the heating and cooling industry.