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Home >> Megaflo Systems >> Overview >> Megaflo ECO Cylinders

Megaflo Cylinder


"Megaflo cylinders are the choice of architects and plumbers – the system most of them would choose for their own home"

Megaflo is the market-leading brand name of Heatrae Sadia's unvented hot water cylinders. The Megaflo name has become synonomous with unvented cylinders and is often used to refer to unvented cylinders in general!

Whilst the Megaflo is priced at the higher end of the UK market, there are now over 20 other manufacturers offering equivalent models of unvented cylinder. Like the Megaflo, they are also made from high quality duplex stainless steel and typically come with a 25+ year warranty (on the cylinder). Essentially, unvented systems are available for all budgets and to suit individual and specific requirements. The cylinders are generally heated by a gas boiler, electric immersion heater or a renewable heat source, such as solar thermal or heat pumps.

Unvented cylinders store hot water under pressure, and when a hot tap is opened, hot water is forced out by the incoming cold water. There are no cold water storage cisterns, vent pipes or expansion tanks, just high pressure hot and cold supplies direct from the mains.

Without getting too technical, an unvented cylinder relies on the incoming water pressure and flow rates. There are no moving parts and if correctly installed, provides a reliable and efficient hot water system. There are a number of safety devices which are essential to ensure safe operation.

Vented Systems

Traditional British domestic hot water systems consist of a hot water cylinder fed from a storage cistern that is vented to the atmosphere. The flow rate and water pressure is dictated by the vertical distance of the storage cistern above the outlets.
A typically house or bungalow with a storage cistern in the loft, will have a vertical distance of 1 meter from the storage cistern to the shower head. This equates to 0.1 bar pressure.
An Unvented System will typically deliver at least 10 times that pressure for both hot and cold water!

Unvented Systems

Today, most new homes have Unvented hot water storage systems installed as standard. These are usually connected directly to the cold water mains supply and therefore do not rely on a storage cistern in the loft. Unvented cylinders are sealed to the atmosphere and provide a highly efficient means of storing and distributing hot water throughout your home. As the water is stored under pressure, it is importantant that it is installed correctly by a G3 qualified engineer.

Unvented Systems offer the following advantages:

And the following disadvantages:

Which is better - Vented or Unvented?

This is a question that often gets overlooked!
We have seen many cases where the customer would have been 'better off' with their old vented system, rather than the poor performing Megaflo Unvented (obviously installed by others, I hasten to add!).

Generally, unvented systems offer better performance over traditional gravity systems. They provide mains pressure hot and cold water to all outlets. They are suitable for anything from a small studio flat to a large multi-bathroom mansion. It just needs to be specified and installed correctly.

For us, there have been one or two cases where we have recommended not to install a Megaflo Unvented system. This may be due to the plumbing layout, available space or some other important factor.

In summary, a Megaflo or Unvented system is virtually always better than a gravity system. However, it is extremely important to use a company that fully understands the requirementsa and available options to ensure the optimum performance.

If you are in the Guildford, (Surrey) or surrounding areas contact Megaflo Unvented for some written quote or just some honest and professional advice.

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