Unvented Cylinders

Unvented Cylinder

We’re fully qualified to install, repair and replace both open vented and unvented cylinders.

What is an ‘unvented cylinder’?

There are generally two types of hot water cylinder – open vented and unvented.

‘Open vented’ are the traditional  cylinders that are generally found in older heating systems – they’re fed by a cold water tank in the loft.

Unvented cylinders on the other hand are fed directly from the cold water mains supply and make up part of a ‘closed’ heating system. Unvented systems offer a number of benefits compared to conventional systems including higher pressure and flow rates at all hot taps, balanced hot and cold water supplies, with no special taps required.


Fully Qualified

Our engineers have undertaken a specific GasSafe qualification in order to work with unvented cylinders.

Top Tip – Whether you decide to give us a call, or work with another heating engineer, make sure that you ask to see their GasSafe card and check the back of the card for the qualifications they hold. If you don’t see ‘unvented cylinders’ on the card, then they don’t have the relevant qualification and should not be working on this kind of system.


Frequently Asked Questions

I’m not sure whether I want/need an unvented cylinder or an open-vented cylinder – can you advise me?

We’d be more than happy to take a look at your heating system free of charge to be able to provide you with advice on which one to choose.  Our engineers are clear, concise and know their stuff.

What’s a Megaflo?

You may have heard unvented cylinders referred to as ‘megaflos’.  Megaflo is the name of one of the best known brands of unvented cylinder available in the UK.

How much would it cost for you to install an unvented cylinder?

Prices vary depending on your heating system and current set up.  Get in touch on 0800 690 64000800 690 6400 and request a free quote.