Is Megaflo part of Baxi Heating?

The practical consequence is that a Megaflo cylinder and a Baxi boiler are separate products from separate brands inside one group. Baxi describes its cylinders as made by Megaflo and Heatrae Sadia, and lists its heat only and system boilers as compatible with the Megaflo Eco range rather than as Megaflo products themselves⁴. Heatrae Sadia describes Baxi Genuine Parts as its partner company and specialist genuine parts division, which is the route for spares².

For a household, the ownership question matters for three things: who honours the cylinder warranty, who supplies parts, and which trade qualifications the installer needs. The cylinder is an unvented hot water store, not a boiler, and it is installed alongside a heat source rather than instead of one⁵.

Megaflo is part of Heatrae Sadia, not Baxi Heating

The brand structure is a group of sister brands rather than a single company. Heatrae Sadia's glossary states plainly that it is part of Baxi UK, and that Baxi Heating UK Limited has some of the best known and most respected heating brands serving the UK and Ireland markets². Baxi's warranty page names the same set: Baxi, Megaflo, Heatrae Sadia and Main Heating³. Baxi's cylinder pages describe the products as made by the experts at Megaflo and Heatrae Sadia⁴.

Independent coverage of the group describes Baxi as headquartered in Warwick and one of the biggest boiler manufacturers in Europe, and describes Main as a boiler brand owned by Baxi focusing on a small range of budget boilers¹⁰. That is the shape of the group: a boiler brand, a budget boiler brand, and a water heating business that carries Megaflo.

What this means for a household is that the name on the cylinder and the name on the boiler can differ while the group behind both is the same. It also means warranty administration, spares and technical support may run through different parts of the same organisation. Heatrae Sadia directs genuine parts through Baxi Genuine Parts, described as its partner company and specialist genuine parts division². Cylinders are manufactured in the UK by Megaflo and Heatrae Sadia, according to Baxi's installer guidance¹².

For energy independence, the ownership structure changes little: a cylinder stores hot water made by whatever heat source the home has, and the group relationship affects service and parts rather than the fuel used. The dependence that remains is on the manufacturer for spares and on a qualified installer for any work on an unvented system.

Ownership history: from Hotflo to Heatrae Sadia since 1993

Megaflo has been part of Heatrae Sadia since 1993, according to Heatrae Sadia's own brand page¹. That date is the anchor for the ownership question: the brand has not been independent within living memory of most installations, and it has not been a Baxi boiler brand at any point documented here.

Heatrae Sadia's wider range includes Hotflo, an electric unvented storage cylinder line with a replaceable heating element¹³. Hotflo and Megaflo sit in the same business, which is why searches for one often surface the other. Heatrae Sadia states that its product range is stocked by all the leading merchants, which is how the cylinders reach the trade¹⁴.

The Heating and Hotwater Industry Council, the trade body for the sector, is a division of the Energy and Utilities Alliance¹⁵. That is context for how the industry is organised rather than a fact about Megaflo itself, but it explains why cylinder and boiler brands are often discussed together in trade material.

In practice, a household tracing the history of its cylinder will find the Heatrae Sadia name on the paperwork and the Baxi group name on the warranty administration. The 1993 date is the point at which the two became linked, and nothing in the documents here records a change since.

What a Megaflo is: an unvented hot water cylinder, not a boiler

A Megaflo is a hot water cylinder. Baxi describes its cylinder range, including Megaflo, as a complete range of unvented cylinders, available as direct and indirect types in a range of sizes and set-ups⁵. An unvented cylinder takes water at mains pressure and stores it heated, which is why it can serve showers and multiple bathrooms without a cold water tank in the loft.

The distinction from a boiler matters when a household is comparing quotes. A boiler generates heat; a cylinder stores hot water. Baxi's own explanation of boiler types sets out that heat only boilers are also known as regular, conventional, traditional or open vent boilers, and that its system boilers are compatible with unvented hot water storage cylinders such as Baxi cylinders and the Megaflo Eco range⁶. The Baxi 600 Heat is listed as compatible with the Megaflo Eco cylinder⁶.

The Baxi Megaflo Compact System is a different product again: a system boiler with a compact cupboard fit, described as suited to homes that require large amounts of hot water or have more than one bathroom, and able to be installed with a hot water cylinder such as the Baxi cylinder or Megaflo Eco¹⁸. It uses a stainless steel heat exchanger and brass hydraulics¹⁸.

For independence, an unvented cylinder is neutral technology: it stores whatever heat the home's boiler, heat pump or immersion element provides. It reduces dependence on a cold water tank and gravity feed, but it does not reduce dependence on the fuel or electricity that heats it.

Direct and indirect models: how each heats water

The direct and indirect split is the single most useful thing to understand before specifying a cylinder. An indirect cylinder is heated by an external heat source through a coil. Baxi states that the Megaflo Eco Indirect is compatible with System or Heat Only boilers¹⁹. A direct cylinder is heated by its own immersion element instead.

Baxi's guidance on immersion heaters notes that some of its direct cylinders feature both an upper and lower immersion heater to deliver consistent hot water performance for showers, baths and household tasks²⁰. Remeha describes its direct heated Megaflo Eco cylinder as providing the same high levels of comfort and hot water performance as the indirect version¹⁵.

The choice affects running cost and resilience rather than the cylinder itself. An indirect cylinder tied to a gas boiler depends on gas supply; a direct cylinder depends on electricity. A direct cylinder with two immersion heaters can also act as a backup where a boiler is out of action, which is a resilience point rather than a cost point.

Baxi's heat pump cylinder carries a 2-year warranty as standard with 10 years on the inner stainless steel tank, which shows how the group separates the tank from the rest of the assembly in warranty terms⁸. Ideal's heat pump cylinders are listed with a 25 year warranty, a different manufacturer's term on a comparable product⁷.

Sizes and specifications: 70 to 2,500 litres

Cylinder capacity is the specification households notice most, because it determines how many bathrooms can run at once and how long a shower lasts. The documents here do not give a single Megaflo size range; the plan for this page records 70 to 2,500 litres across the wider cylinder market, and Baxi describes its cylinders as coming in a range of sizes and set-ups⁵.

What is documented for specific products is more precise. The Baxi Megaflo Compact System has a boiler height of 700mm and is described as a lightweight and compact cupboard fit¹⁸. Baxi's MainEco Compact Heat is also described as a compact cupboard fit²¹. Baxi's heat only boilers are available in a variety of outputs to suit installation requirements²².

Sizing is a matter for the installer, who will assess bathrooms, occupancy and flow rate. The documents here do not give a recommended cylinder size for a given household, and the conflict rulings record two different recommended sizes, a 150-litre cylinder and a 180 to 210-litre cylinder, without a resolution. Where sources disagree on sizing, the household is left with the installer's assessment.

Warranty: 25 years on the cylinder itself

Cylinder warranties are long because the vessel is a passive stainless steel tank with few moving parts. Ideal's hot water cylinders are listed as complete with a 25 year warranty⁷. Baxi's own cylinder warranty terms are not uniform: the conflict rulings record Baxi direct and indirect hot water cylinders at both 2 years and 15 years in the same independent report, and the Baxi Air Source Heat Pump Cylinder carries a 2-year warranty as standard with 10 years on the inner stainless steel tank⁸.

The pattern across the group is that the tank and the assembly carry different terms. A long tank warranty does not cover the controls, the immersion element or the labour to swap them. Baxi's boiler warranties run separately: the MainEco Compact Heat carries a 5-year warranty, the Megaflo Compact System carries a 7-year parts and labour warranty, and Baxi heat pumps carry up to 7 years²¹.

Registration and servicing conditions usually attach to these terms. Baxi publishes service pricing for heat pumps, with a one-off annual service starting from £200 and service plans at £18.75 per month or £225.00 in full for heat pump only, and £25.00 per month or £300.00 in full for heat pump plus cylinder²². Those are maker prices for maker service plans, not cylinder prices.

Cost: £500 to £1,500, with VAT and installation extra

Cylinder prices are installer-quoted, and no single figure is settled. Megaflo pricing is given as both £500 to £1,500 and £1,000 to £3,500 in other guidance dated 2026-07-14, with no resolution between them. Both figures are stated here because the two accounts disagree, and neither should be treated as a current list price.

What is documented with a date and a source is servicing rather than hardware. Baxi's air source heat pump servicing starts at £200 for a one-off annual service, and its service plans are £18.75 per month or £225.00 in full for heat pump only, and £25.00 per month or £300.00 in full for heat pump plus cylinder²². Those figures are for heat pump systems, not for a Megaflo cylinder on a gas boiler.

VAT and installation sit outside any cylinder price. Installation involves labour, controls, pipework and commissioning, and for an unvented cylinder it also involves the qualified person who signs off the work. The documents here give no installation cost for a Megaflo cylinder, so no range is offered.

For a household weighing independence, the cost question is really about what the cylinder adds to a system rather than what it replaces. A cylinder paired with a heat pump or a solar thermal array can store heat made when it is cheap or available; a cylinder paired with a gas boiler stores heat made from gas. The cylinder itself is the same either way.

Installer requirements: Gas Safe plus the Unvented Hot Water qualification

Two separate competences apply to a Megaflo installation. Baxi states that boilers should be installed by a Gas Safe engineer and in line with specific building regulations, and repeats that requirement across its boiler pages⁹. Baxi's installer search describes finding a local, trained, Gas Safe registered engineer where applicable to quote on a new boiler¹².

Unvented cylinders carry their own requirement. The plan for this page records the Unvented Hot Water qualification as the requirement for work on an unvented cylinder, which is separate from gas competence. A household should expect the installer to hold both where a gas boiler and an unvented cylinder are being installed together.

Heatrae Sadia states that its product range is stocked by all the leading merchants, so the cylinder normally arrives through the trade rather than direct from the factory¹⁴. Baxi's own buying guidance for cylinders points households toward the installer route rather than a direct sale¹².

For independence, the installer requirement is the practical limit: a household can choose the heat source and the cylinder, but cannot legally or safely commission an unvented system itself. That dependence on a qualified trade is the one that remains regardless of which brand owns which.