January 15, 2020

FAQ’s on Unvented Cylinders

We've answered all of your frequently asked questions about unvented hot water cylinders...

What is an unvented hot water cylinder?

An Unvented hot water cylinder is a pressurised system that helps deliver hot water at mains pressure. Hence they're a great option for homeowners with weak-performing showers and baths, i.e. the water pressure for hot water is considerably poor.

Unvented hot water cylinders can be used without the need for a cold water storage tank, making them a great option for homeowners that are pushed for space. Not only that, the water inside the cylinder can be heated directly via an immersion heater, or indirectly via the central heating system or other renewable technologies like solar thermal or heat pumps, making them a great option for almost any home.

If you have a poor performing shower, and you want to boost the water pressure in your home, you should opt for an unvented hot water cylinder.

What's the difference between a vented and an unvented cylinder?

Unlike an unvented hot water cylinder, a vented hot water cylinder takes the more traditional approach whereby it needs to have a cold water storage tank (usually in the loft) in order to work.

The water is then drained down into the hot water cylinder below and is then heated via an immersion heater or indirectly via the central heating system.

The biggest issue with vented cylinders is that they don't always work, i.e. they don't always deliver a higher pressure of water. This is because it is reliant on the cold water tank above acting as an expansion tank, as well as a store.

There is one benefit to a vented cylinder though, they're typically cheaper and require less maintenance due to their simpler nature!

What is better for your home? (Unvented vs Vented Cylinders)

Now we’ve gone through the similarities and differences with unvented and vented systems, we can now explore the pros and cons of each system and what would be the better choice for your home.

Unvented Cylinder Pros

  • No loss in mains water pressure
  • Takes up less space than vented systems due to not needing a cold water feed
  • No chance of freezing or water contamination

Vented Cylinder Pros

  • Coldwater tank acts as access to a backup water supply should the mains fail
  • Low maintenance and easy to maintain
  • Lower installation cost compared to vented cylinders

Unvented Cylinder Cons

  • Requires more maintenance than a vented system
  • Can be issued with compatibility with selected mixer and power showers

Vented Cylinder Cons

  • Depending on the setup - can provide lower than mains pressure
  • Takes up more space and requires a loft for the cold water feed.

Who can install an unvented hot water cylinder?

All unvented hot water cylinders must be installed by an engineer with a G3 Unvented Qualification. It's vital that the cylinder is installed correctly with all of the essential safety controls.

Where can an unvented hot water cylinder be installed?

Because unvented hot water cylinders are pressurised systems, they can be installed in almost any location, making them ideal for homeowners that are tight for space.

You can install them in a loft, garage, downstairs, wherever suits, although you will have to accommodate for a safety discharge pipe.

Do I need to service my unvented hot water cylinder?

We'd recommend servicing your unvented hot water cylinder at least once a year, alongside booking your boiler in for a boiler service.

Doing so can help you keep your central heating system in great shape for years to come.

Would you like to install an unvented hot water cylinder in Pulborough?

Our engineers are G3 qualified and trained to install unvented hot water cylinders.

If you would like to get in touch with us, please give us a call on 01903 740538 or 07871 725133 or send us a message using our contact form.

In addition to Pulborough, we also cover Storrington, West Chiltington, Petworth, Fittleworth, Ashington, Bil-lingshurst, Coldwaltham, Findon, Steyning, Horsham and all surrounding areas.

We'll look forward to hearing from you soon.

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