What is a megaflow boiler and how much does it cost?

If you have a large house with several bathrooms and intend to have more than one shower at a time you will need more power.

A megaflow boiler can deliver high pressure hot water and allow you to run several baths or showers at the same time.

You can compare the prices of megaflow boilers by completing the form above.



What is a megaflow boiler?

Megaflow boilers or unvented hot water systems are becoming much more popular. They are ideal for people who have large houses, several bathrooms and would like to run more than one shower or bath at the same time.

They can come in all shapes and sizes, and can run directly off the electricity which means you can install them in places without easy access to a gas supply. You can also connect them to solar panels giving you another way to save money and reduce your carbon footprint. Learn more.

What’s great about this system is that it gives you high pressure hot water all the time so you won’t have to worry about a slow dripping shower or hot tap. Because it can run off the electrics, it provides electrical backup for heat if the boiler breaks down.

Megaflow boilers typically require an annual boiler service to recharge the air bubble within the tank. The air bubble acts as an expansion vessel to absorb any increases in the volume of water.



How much will a megaflow boiler cost?

Megaflow boilers come in all sizes and models. Costs can vary from just under £1,000 for a smaller package and up to £2,000 for something larger and with a higher performance. Learn more about boiler prices.

Upfront cost is only part of the equation, though. You should also think about the cost of the installation and any ongoing maintenance. If your engineer does not do a good job when installing the system you may be paying the price by fixing problems further down the line.

It is important to ensure your boiler engineer is Gas Safe registered. You can do this by asking for their Gas Safe Register ID card. This will ensure your engineer is legally allowed to work on your boiler.



Who manufacturers megaflow boilers?

Many of the big manufacturers of boilers and heating system also supply megaflow boilers such as Baxi, Vaillant and the Telford Tempests and Tornadoes. Heatrae is one of the leading specialists who have a wide range of megaflow boilers.

Choosing the right brand can be difficult as they will all make similar claims. You should look into the background of each brand, see if there have been any customer reviews to see which one you think would be the best.

Leading megaflow boilers

The Energy Saving Trust has endorsed 5 megaflow boilers. All 5 are manufactured by Baxi.

Magaflo boiler name
Output CH Max Non Condensing
Output CH Min Condensing
Typical Price
Megaflo 15 System ERP
15
4.2
£755
Megaflo 18 System ERP
18
4.5
£785
Megaflo 24 System ERP
24
7.4
£850
Megaflo 28 System ERP
28
10.2
£890
Megaflo 32 System ERP
32
10.2
£905


View our guide to the best boilers



Compare Megaflow Boiler Prices



What are the benefits of a megaflow boiler?

There are many benefits to a megaflow boiler. They can give you large amounts of hot water – enough to run three baths at any one time. There’s no need for booster pumps for showers and baths and it can be adapted to work with solar panels to reduce costs.

It can provide a large amount of high pressure hot water, which is great for having a really good power shower.

It can run off the electrics which is useful for a number of reasons. Firstly it allows you to install it even in places where there is no gas supply and secondly it provides a useful electrical backup if your gas boiler goes down.

However, there are also some problems. Megaflow boilers are very heavy and bulky and will take up a lot of storage space. They are less energy efficient than a normal combi boiler and will result in higher ongoing bills.

They may also need more maintenance. They have more electrical parts which means there are more things which can go wrong – and when they do the repair can be a little more expensive.

Although they do provide large volumes of stored hot water, they can take 45 minutes or more to recover when that water has been used up.



Combi vs megaflow boiler system?

When you’re buying a larger house with several bathrooms you may be advised to buy a megaflow boiler. However, there are alternatives.

A good combi boiler may provide the power you need but this may depend on the pressure of your local water supplier. A megaflow boiler can provide hot water pressure at 3 bar which is a long way above many local authorities.

Because customers have often been asking for a cheaper alternative to megaflows, there are a range of more affordable cylinders designed to offer another option. It all depends on what your water demands will be, so it can be a good idea get an expert to look at your system and advise on the best way forward.

If you are considering installing a megaflow boiler, we recommend you compare against Worcester Bosch’s Greenstar 35CDi Classic System. This is a leading combi boiler capable of handling multiple bathrooms in a large house.

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