Megaflo Unvented Boiler System

The Ultimate MEGAFLO System Guide: Advantages & Disadvantages

If you’re wondering whether you should install an unvented heater system from MEGAFLO in your home, this is the page for you!

Megaflo System - MF Eco 125 Direct

We’re now getting more and more requests to both install and service Megaflo boiler systems.

These unvented heating systems are proving to be massively popular with homeowners throughout London and the Home Counties, thanks to their many advantages – advantages that we’ll discuss further down this page.

If you’re wondering whether you should install an unvented heater system from Megaflo in your home, this is the page for you.

We’ll run you through everything you could ever need to know about this popular unvented system, plus we’ll also answer some of your most commonly asked questions.

Of course, if you do want to find out more, or simply want to chat with someone about the possibility of installing an unvented hot water system, please feel free to call or email us today!

Megaflo (or Megaflow) System: The Basics

Before we look at the more technical aspects of the Megaflo unvented boiler system – which some incorrectly call the “Megaflow system” or “Megaflow boiler” instead – let’s take a look at the basics.

This is a system from the people over at Heatrae Sadia – a highly recognisable and trustworthy name in the industry.

They’ve been around for over 95 years, allowing them to establish themselves as a top name in the world of heating and water storage. Essentially, when you get a product from Heatrae Sadia, you can be sure that it’s the best around.

But what exactly does a Megaflo unvented hot water cylinder do?

Well, it basically stores hot water for you. It can also heat the water using an inbuilt immersion heater – although some prefer to go for the indirect option, meaning that water is still heated using a different source, such as a boiler.

One important thing to remember is that the system isn’t actually a boiler – this is something that often confuses those who are thinking about purchasing the Megaflo system for their home.

If you’re thinking about a Heatrae Sadia Megaflo system, we’d recommend speaking to one of our experts.

They can talk you through the whole process step-by-step and answer any questions you might have. Why not call today?

Megaflo System

The Megaflo Boiler System Explained

So, let’s now look at exactly how the system works.

There are actually two different options open to you when installing a Megaflo system, and they are an indirect system or a direct system.

But what are the differences between a direct and indirect hot water supply system?

You can find out below…

Indirect Unvented Megaflo System

An indirect system doesn’t heat the hot water itself. Instead, it receives hot water from a boiler and then acts as a storage system, maintaining the water temperature. When the water is used, the cylinder will once again fill with hot water from the boiler, ensuring your cylinder is always ready to go.

Direct Unvented Megaflo System

The direct system connects directly to the mains water supply and the immersion heater inside the cylinder then heats water, until it’s at the required temperature. As hot water is used, the system simply lets in more water from the mains supply and then starts warming it again.

The direct unvented Megaflo system is the more popular choice with our customers, however we will ensure that an expert is on hand to advise you regarding which system would be best for your home.

Megaflo Boiler System

Advantages & Disadvantages of Megaflo

The Advantages of the Megaflo System

The Megaflo unvented cylinder system is very popular so, as you might expect, there are a number of big advantages to its installation.

The biggest is the fact that you can remove that bulky cold water tank though, therefore creating lots more space in your home.

The lack of a cold water tank also means that the unhealthy aspects of the cold water tank are removed, instead replacing it with a far more hygienic system.

You’ll find that cold water tanks often collect foreign objects, like dust and grime, and this contaminates the water. The Megaflo will never collect these nasty extras though, leading to a far more hygienic experience.

Then there’s the fact that, generally speaking, the unvented Megaflo system will increase the pressure of your water. This is because it will be forced through the system at the pressure of your mains supply. What’s more, you won’t see a drop in pressure if more than one tap or outlet is being used, unlike with some traditional hot water systems.

If you’re worried about whether the system will be compatible with any solar panels you already have installed, then you can stop worrying. You’ll find that the Megaflo boiler system integrates perfectly with solar panels, ensuring you can still do your bit for the environment.

Finally, the system really couldn’t be much easier to install, meaning that installation and labour charges are going to be reduced.

It’s also simple to maintain, with parts readily available for fair prices. The Megaflo unvented boiler system must be installed by a Gas Safe engineer though, like those working for us right here at PHS.

The Disadvantages of the Megaflo System

We think that the Megaflo system is fantastic, however we’re an honest company, so we also want to let you know about some potential problems.

The biggest is the fact that some older piping systems might not be able to handle the pressure offered by the Megaflo system, which could result in damaged, or even burst, pipes. This is why we’ll always do a full survey of your entire hot water system prior to installation, to ensure it is strong enough to withstand the rigours of the Megaflo system.

While the Megaflo generally leads to much higher pressure, there are occasions when the pressure will instead drop. This is the case if the water mains pressure is low. Once again, there’s no need to worry about this though, as our survey before installation will pick up on any issues with the mains water pressure.

Finally, the system can be a bit noisy, due to the high pressure of the water flowing through the pipes. You will have to decide whether this is something you are okay with before the system is installed.

We should point out that, while there are potential problems, they are rare, plus we’ll be able to warn you of most issues before the system is installed. If there are problems before the installation, we’ll work with you to come up with an alternative solution.

Megaflo System

How Safe is the Megaflo Cylinder?

Safety is, of course, a huge priority with everything we do, and we can honestly say that the Megaflo unvented boiler system is one of the safest systems around. Here are a few safety advantages to the system:

  • The default temperature of the system is 60-65° Celsius. This can be changed, however we recommend leaving it at the default setting, as this helps to prevent any risk of Legionnaires Disease.
  • The water inside the cylinder will never reach an unsafe level of heat. Should the water rise to a temperature exceeding 85° Celsius, the thermostat automatically stops the heating process.
  • Every Megaflo system has a Temperature/Pressure Release Valve (TPRV), ensuring that the temperature and pressure will never build to unsafe levels.

Please remember that this unvented boiler system must be installed and maintained by a Gas Safe engineer.

Homeowners should never attempt to install or maintain the system themselves, as this can be dangerous, plus it contravenes the laws laid down in the Building Regulations Approved Document.

Megaflo Unvented Boiler System FAQs

A Megaflo (also known as a Megaflo system, Megaflo unvented system, or often misspelt as “Megaflow system” or “Megaflow boiler”) is a stainless steel unvented cylinder that stores hot water as part of a central heating system.

The Megaflo system comes in various sizes, from 70 litres, all the way up to 300 litres.

The size you need is really dependent on how large your home is, and how much demand for hot water you have.

We will speak with you before starting any installation to ensure you get the size you need.

We offer all Megaflo sizes, so we’ll always find the perfect option for you.

This really depends on your boiler. If you want to completely replace the boiler, we’d recommend a direct system, however if you’re happy with your boiler and want to continue using it, an indirect system is best for you.

This is something one of our experts will discuss with you when they first speak with you.

The thermostat will sense the temperature of the water inside the cylinder. It will then switch on the heating process when the water drops below the specified temperature, and will then turn the process off once the correct temperature is reached.

Absolutely not – please do not try to install or maintain any part of the Megaflo system, as it must be done by a Gas Safe certified engineer.

Attempting your own install could lead to a dangerous situation, so it is always best to leave it to professionals – such as us, right here at PHS!

Yes, an unvented hot water cylinder can be fitted to a combi boiler, and it’s done in pretty much the same way as a standard boiler.

As with the previous question though, this should always be done by a professional, certified engineer.

Interested in the Megaflo Boiler System?

After reading through everything about the Megaflo hot water cylinder system on this page, you should realise that it’s a fantastic choice for many households.

We’re specialists at Megaflo installation and maintenance, with the experience and expertise needed for this work.

Why not call us today and speak to one of our team about whether the Megaflo hot water cylinder is a good option for you?

There will be no sales patter or pushy sales tactics – just a good honest discussion about installing a Megaflo heating system in your home.