Baxi Megaflo Boiler Guide – Costs And Features

Baxi Megaflo Boiler Guide - Costs And Features

When you need a new boiler and your home has a high demand for hot water, then you’ll need a system boiler that can both cope with your requirements and meet them as efficiently as possible.

Even if you get the best combi boiler, it just won’t keep up to the work. One manufacturer who might be on your list for a system boiler is the UK company, Baxi.

Baxi has been involved in manufacturing since 1866 and currently employ around 1,500 people across their UK sites. Baxi is part of the BDR Thermea Group which operates in more than 100 countries across the world with over 6,000 employees.

So, this is a company with all the credentials to be a serious contender, and the Baxi Megaflo System HE boiler could be an excellent fit for your requirements and arguably the best system boiler on the market.

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What Is A Baxi Megaflo Boiler?

The Baxi Megaflo system boiler is a great choice for where you need high volumes of hot water and where that demand comes from several different outlets all at the same time. So that might be someone having a shower while the dishwasher is also on.  A built-in immersion heater and system boiler pre-heats the water which is then stored in a cylinder until it’s needed; that means it can then cope with those multiple demands.

While you’re keen to have your hot water and heating needs met, you may also want to ensure that your Baxi boiler meets the highest environmental and efficiency standards. With a 91% efficiency rating combined with an ErP A-rating for central heating, the Baxi Megaflow system meets that requirement with no problem.

Baxi Megaflo Boiler Models Explained

There are five different kW outputs available for this model ranging from 15kW right up to 32kW. We’ve picked out three to show how the Megaflo could be the right choice for a wide range of home sizes.

Baxi Megaflo 15

While this may be the lowest output in this model, it’s by no means underpowered. If you have up to 8 radiators in your home, then this one is likely to be a great fit.

Maxi Megaflo 24

This is the mid-range model with an output of 24kW. As a rough rule, each radiator needs around 1.5kW, so a home with 16 radiators is likely to be a good match for this one.


Baxi Megaflo 32

Ideal for the largest of homes, the Baxi Megaflow 32 is the most powerful of the range and will efficiently heat up to 20 radiators.

Baxi Megaflo System Compact GA

This is a new addition to the Baxi boiler replacement range and comes with the same choice of power options as the standard model. The big advantage to this model is that all versions, other than the 32kW, are small enough to be fitted into a kitchen cupboard.

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Features And Benefits Of A Baxi Megaflo Boiler

The Baxi Megaflo is a powerful system which means that it can quickly provide hot water no matter the distance from the hot water tank or how many hot taps are on at the same time.  It’s a model known to have high energy efficiency combined with very low fuel consumption resulting in much lower bills for the homeowner.

The Megaflo is also a favourite of the gas installers because many of the key components such as the pump and expansion tank, are built into the system. This then means a quick and straightforward installation process.

If you’ve ever looked at an array of buttons and dials on a boiler and wondered which one needs to be pressed for what, then you’ll love the ease of use of the Baxi Megaflo. There’s one control which selects off, reset and to turn the hot water and heating on. Then you have a display to show you the boiler output temperature and finally a dial to adjust the temperature of the central heating

How Much Do Baxi Megaflo Boilers Cost?

The Baxi Megaflow new boiler cost will depend on the kW power that you need for your home. So that means that the 15kW system is going to be cheaper than the 32kW version. As a guide to the price, you can expect to pay:

ModelGuide Price
Megaflo System 15 HE A£697
Megaflo System 18 HE A£722
Megaflo System 24 HE A£804
Megaflo System 28 HE A£834
Megaflo System 32 HE A£858

All our guide prices include VAT but don’t forget to add boiler installation to your budget.

Troubleshooting For Baxi Megaflo Problems       

From time to time, all boilers experience issues. Sometimes, the Baxi Megaflo problems that occur might be things which you’ll be able to fix yourself without needing to call in an engineer. Common Baxi problems and errors include:

Frozen Condensate Pipe

The condensate pipe collects the liquid or ‘condensate’ which is produced through the production of heat within the boiler. Sometimes the pipe runs to a drain, but it might also run through a wall and into an external drain. When the temperature drops, the liquid can freeze blocking the drainage system.

This is an easy one to fix and just needs you to pour hot water over the pipe to defrost the ice blockage.

High Boiler Pressure

If the water pressure goes above 3.0 bar, it can be reduced by bleeding a radiator or draining some of the water out of the system. This is done through the drain point which is usually found underneath a radiator.  

Low Boiler Pressure

If the system is losing pressure and shows a reading of below 1.0, then it will need to be repressurised. This is done by topping up the water via the fixed filling loop, which will then increase the pressure.

Boiler Locked

The boiler will lock if there is a problem which might interfere with its safe running. Turn the selector switch the ‘r’ position and hold in for five seconds to see if you’re able to reset the boiler.

Fault Codes

The fault code on the control panel will help you work out what the problem is and whether you can fix the issue yourself or whether you need to call out an engineer.  These include:

E28Blocked condensate pipeCheck pipe for frozen water, then thaw with hot water
E110Water system overheatedReset the boiler
E119Low Water PressureTop up the water via the filling loop
E133Interruption of gas supplyCheck the gas valve to ensure the supply hasn’t been turned off and then reset the boiler
E160Faulty componentCall out engineer


Warranty For Baxi Megaflo Boilers

The Baxi Megaflo system boiler comes with a seven-year warranty which includes both labour and parts should you have any problems, included in the boiler replacement cost. This is longer than many other manufacturers which is a good sign of the confidence Baxi have in the quality of their products and also to give you peace of mind.

Do make sure that you follow Baxi’s requirements to keep the warranty valid, these include:

  • A Gas Safe heating engineer fits the boiler
  • Registering the boiler within 30 days of installation
  • Annual servicing.

Full details can be found in the boiler guide and also on Baxi’s website here.


The Baxi Megaflo is an excellent replacement boiler choice for both larger homes and those who have multiple demands on the hot water supply all at the same time. Despite the power of the system, it’s still very efficient and has a low fuel consumption, making it better for the environment and for your utility bills!  If you’re still not sure if the Baxi Megaflo is the right one for you, have a look at our interactive guide to finding the right boiler option for you with our new boiler deals.

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