Unvented Hot Water Cylinders

Name: Water cylinder valves / electrics and circuit board for boiler.
Rating: 10

Installation and servicing of unvented, mains-pressure hot water cylinders across Brighton & Hove.

What an unvented cylinder is

An unvented cylinder is a sealed hot water storage system fed directly from the mains, rather than from a header tank in the loft. That means hot water comes out at mains pressure, with a stronger flow rate to multiple outlets at once, unlike a traditional vented, tank-fed system.

Mains-pressure hot water
Sealed system, fed directly from the mains
Strong flow rate to multiple outlets at once
No header tank needed in the loft

Need work on a cylinder?

Unvented work needs a separately ticketed engineer. Tell us what you have and we will advise.

Call us01273 110667 Send an enquiry

24 hours a day, 7 days a week

Who it suits

Homes with multiple bathrooms
Households with higher, simultaneous hot water demand
Properties without loft space for a header tank

The G3 regulation

Unvented cylinders are covered by Building Regulations Part G3. Installation, maintenance and sign-off must be carried out by a suitably G3-qualified engineer. This is a legal requirement, not just good practice.

Why choose On Heating for this

Gas Safe registered

All gas work is carried out by Gas Safe registered engineers.

Brighton & Hove based

Local to the area we work in, not a call centre booking system.

Same team, new name

On Heating is Pierson Heating under a new name, same engineer and standards.

Unvented hot water cylinders

What customers say about our hot water work

250+ five-star reviews4.9 on Google 10/10 on Checkatrade

Installed new unvented heating and hot water system with system boiler.Checkatrade 9.75/10

Pierson Heating were incredibly helpful with suggesting the best place for our new boiler, helping to save space in a small house, the work that they did was amazing. It was all done very quickly and they cleaned up after themselves everyday. We didn't have to chase them for details or to finish the job, like with so many other companies. Attempting to renovate your first home can be a very stressful experience and Pierson heating were fantastic during this, reliable and hard working. We where very happy with the work that they did and will definitely use them again.

Google 5/5

Very happy with the quick and careful installation of my new hot water system. Lee and his team did a great job and the new system works great! Highly recommended.

Google 5/5

New boiler and removal of old header tank, cylinder and associated pipework. Really excellent team who are trustworthy and highly professional.

Service of boiler and repair of hot water tank issueCheckatrade 10/10

Lee was a personal recommendation and is knowledgeable, polite and his service is excellent value for money.

Supply and install hot water tank and timer.Checkatrade 10/10

Lee is always punctual. He explains exactly what he is doing and why and is very helpful in giving advice.

Water cylinder valves / electrics and circuit board for boiler.Checkatrade 10/10

Efficient, friendly service. Job fully completed and everything now working as it should be.

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More from Brighton & Hove customers

Across every job we take on.

Lee is a nice guy, he has done our Gas Certificate the last couple of years.

Checkatrade 9.75/10Verified reviewer

Very knowledgeable and helpful in advising on replacement items. Happy with the work done.

Checkatrade 9.75/10Verified reviewer

Professional and reliable, recommend this company to friends and family.

Checkatrade 9.75/10

Were called at 8:15 am and arrived at 9 am as boiler were broken. Fixed as per quote.

Checkatrade 9.75/10

Very informative considerate the job was completed on time at the price quoted, I would recommend him to everyone. Well done Lee!

Checkatrade 9.75/10Verified reviewer

Very reliable and always responds! I would highly recommend Lee

Checkatrade 9.5/10BN42

I'm no heating engineer, but very impressed by the service and efficiency, and even more so by the cleaning up afterwards. Lee is a credit to his profession.

Checkatrade 9.5/10Verified reviewer

Would recommend Lee for any plumbing work always goes the extra mile.

Checkatrade 9.5/10Verified reviewer

Very happy with the speed at which the job was completed. Gave a very competitive price for the work.

Checkatrade 9.5/10Verified reviewer

Resolved our boiler issues in a professional and timely manner, fitting into our schedule and even working at a weekend.

Checkatrade 9.5/10Verified reviewer

Unvented cylinder FAQs

What’s the difference between vented and unvented cylinders?

A vented cylinder is fed from a header tank in the loft, at lower pressure. An unvented cylinder is a sealed system fed directly from the mains, giving stronger, mains-pressure flow without needing a loft tank.

Do I need planning permission or building control sign-off?

You don’t need planning permission. Installation does need to comply with Building Regulations Part G3, which means it must be carried out and signed off by a suitably qualified engineer. This is a building control matter, not a planning one.

Can an unvented cylinder work with my existing boiler?

In many cases, yes. Get in touch and we can look at your current setup to confirm what would work.

How much space does it need?

Unvented cylinders don’t need a header tank in the loft, so space requirements generally come down to the cylinder itself and its location, rather than needing loft space as well.

Need work on an unvented cylinder?

Tell us what is going on and we will tell you what it needs. Gas Safe registered, based in Brighton & Hove, and no charge for the conversation.

Call us01273 110667 Send an enquiry

24 hours a day, 7 days a week

Ready to sort your heating?

Enquire Online 01273 110667