Unvented Hot Water Cylinder Service & Repairs

If your unvented hot water cylinder needs a fixing, or a just a simple service, we can help you!

Online Booking
Transparent Pricing
Gas Safe Registered
5 Star Reviews
understanding the mechanism

Why Choose Us To Look After Your Unvented Hot Water Cylinder?

For over 25 years, we’ve specialised in servicing and repairing unvented hot water cylinders across Kent.

Our expertise means you’ll get reliable hot water when you need it, plus all the unvented cylinder benefits like better pressure and faster heating.

We’ll share maintenance tips to keep your system running smoothly, and you can trust us to treat your home like it’s our own.

Our Gas Safe registered team ensures compliance with safety standards, providing you with peace of mind and quality service.

We also have public liability insurance to protect our customers and provide additional security during our work. With an average rating of 5 out of 5 stars, our high customer satisfaction reflects the quality and reliability of our services.

kent unvented cylinder services

How It Works

1. Book Online

Booking your unvented cylinder service couldn’t be simpler with our 24/7 online booking system.

Just visit our booking page, select your preferred date and time, and we’ll take care of the rest.

We’ll send you confirmation right away, and on service day, you’ll get real-time tracking updates when we’re on our way.

It’s part of how we’re making unvented cylinder maintenance hassle-free for our Kent neighbours.

2. On Our Way Text

Once you’ve booked your appointment through our online system, we’ve designed a simple way to keep you updated on service day.

When our engineer is heading to your property, you’ll receive our on our way text message with a live tracking link.

Our customer notification system means you’ll know exactly when we’re arriving, so you can plan your day with confidence.

3. Service Your Cylinder and Issue Your Service Certificate

Getting your unvented cylinder serviced couldn’t be simpler with our streamlined process.

We’ll thoroughly inspect your system, checking for common issues like pressure problems and valve wear.

Once we’ve completed the maintenance and addressed any concerns, you’ll receive your digital certificate right away – no paper forms or waiting around.

We’ll even share some cylinder maintenance tips to keep things running smoothly between services.

Book Your Unvented Cylinder Job Online

Ready to schedule your unvented cylinder service or repair?

Book your appointment online in just a few clicks through our easy-to-use booking system. Simply visit our online booking page to select a convenient date and time.

You’ll receive instant confirmation and a real-time tracking link on the day of service, so you’ll know exactly when we’ll arrive.
Available slots fill quickly, so secure your preferred appointment time today.

Recent Customer Reviews

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Unvented Hot Water Cylinder Repairs In Kent

When it comes to unvented cylinder repairs in Kent, we’re here to help with common issues like water running from the overflow, hot water pressure problems, and situations where you’ve got no hot water at all.

We recognise how frustrating these problems can be, especially when you’re trying to get ready for work or need hot water for your family’s daily routine.

With our expertise in unvented cylinders, we’ll diagnose the issue quickly and get your hot water system working properly again, whether it’s a faulty valve, pressure problems, or something more complex.

Water from the overflow

Inside your unvented hot water cylinder, water dripping from the overflow pipe or tundish often signals an underlying issue that needs immediate attention.
When we investigate these overflow issues, we typically find it’s caused by a faulty pressure relief valve, temperature and pressure valve, or expansion vessel.
Sometimes, it’s due to cylinder overheating from failed thermostats.
We’ll help diagnose and fix your tundish maintenance concerns quickly.

Hot water pressure problems

Issues with hot water pressure can be just as concerning as overflow problems in your unvented cylinder.
We often find that pressure fluctuations are caused by either a faulty cold water combination valve or a problematic expansion vessel.
When you’re experiencing inconsistent water efficiency from your hot taps, we’ll check these components first to restore your system’s proper performance.

No hot water

Have you turned on your hot tap only to find no hot water coming through?
We’ve seen this issue many times with unvented cylinders. Often, it’s simply a tripped overheat thermostat that needs resetting – something we can quickly fix for you.
But if it keeps happening, or if you’re experiencing issues with your immersion heater or motorized valve, we’ll investigate the root cause.

unvented cylinder service brands

Unvented Hot Water Cylinder Servicing In Kent

At Thames Boilers, we’re experts in servicing unvented hot water cylinders and ensuring they operate safely and efficiently.

We’ll thoroughly inspect all safety devices and discharge pipework, making sure everything’s properly installed and functioning as it should.

During the service, we’ll also check and recharge your expansion vessel or air gap, providing you with a digital service certificate once we’re done.

Safety devices form the core protective components of your unvented cylinder system, which is why we thoroughly test each one during our annual service visits.

As your local experts in Kent, we’ll check all safety device types, including pressure relief valves and temperature controls, following strict testing procedures to guarantee everything’s working as it should to protect your home and family.

Proper discharge pipework maintains safety alongside the protection devices we’ve just discussed.

During our discharge inspection, we’ll thoroughly examine all pipework to guarantee it’s correctly installed and functioning as it should.

Our pipework maintenance check helps protect your home from potential leaks or discharge issues.

We take pride in keeping your unvented cylinder system safe and efficient for your family.

Every unvented cylinder relies on its expansion vessel or air gap to manage water pressure and thermal expansion effectively.

During our annual servicing, we’ll check and recharge your expansion vessel or adjust the air gap to guarantee peak performance.

This essential expansion vessel maintenance helps prevent pressure-related issues, while proper air gap adjustments keep your system running smoothly and safely.

Unvented Cylinder Brands We Work On

Here are the unvented cylinders brands that we can service and repair for you…

Heatrae Sadia / Megaflow Cylinders

The Heatrae Sadia Megaflo range stands as a leading choice for unvented hot water cylinders in Kent homes.

Thames Boilers regularly services and repairs popular models including the Megaflo Eco, Megaflo Eco Plus, Premier Plus, and PremierPlus SystemFit cylinders.

These British-manufactured units are known for their reliability and superior hot water delivery, though they still require annual servicing and occasional repairs to maintain ideal performance and safety compliance.

Gledhill Cylinders

Gledhill Cylinders are a popular choice among homeowners in Kent, and Thames Boilers regularly services and maintains various models from their range.

Common models we work with include the Gledhill PulsaCoil, StainlessLite Plus, BoilerMate, and the Torrent stainless steel range.

Our expertise extends to fault-finding, maintenance, repairs, and annual servicing of these reliable British-made cylinders, ensuring they operate safely and efficiently.

Telford Cylinders

Thames Boilers specialises in servicing and repairing Telford unvented cylinders, including the popular Telford Tempest, Telford Hurricane, and Telford Tornado models.

With extensive experience working on these robust stainless steel units, our Gas Safe registered engineers are well-versed in maintaining and troubleshooting common issues specific to the Telford range.

This ensures these systems continue to provide reliable hot water for domestic properties across Kent.

Vaillant Cylinders

Specialising in Vaillant unvented cylinders, Thames Boilers provides expert service and repairs for the full range of Vaillant hot water storage solutions, including the uniSTOR, auroSTOR, and actoSTOR models.

These premium-quality stainless steel cylinders are known for their reliability and efficient hot water delivery, but like all unvented systems, they require regular maintenance and occasional repairs to maintain safe operation and peak performance.

Kingspan Cylinder

Kingspan’s Tribune HE and Ultrasteel cylinders are among the most common unvented systems we service and repair in Kent.

The Tribune HE range comes in sizes from 120 to 300 litres, featuring internal expansion capability and thorough safety components.

Meanwhile, the Ultrasteel series is designed for superior heat retention and energy efficiency in domestic hot water storage applications.

RM Cylinders

RM Cylinders offers an extensive range of unvented hot water cylinders that we regularly service and repair throughout Kent.

Our expertise covers their entire product line, including the popular PreLine, SystemLine, and PremierPlus models, which are known for their reliability and efficient hot water delivery.

We’re fully trained to work on both direct and indirect RM cylinder variants, ensuring professional maintenance and repairs that keep these systems operating at peak performance.

We’re G3 Registered

Here’s Why It’s Important

Nearly every unvented cylinder installation or repair requires a G3 certification, which we proudly hold.

We’ve invested in this essential qualification because we recognise its importance in keeping your home safe.

G3 regulations require that only qualified professionals like us can work on these complex systems.

When you choose us, you’re choosing peace of mind and compliance with all safety standards.

Frequently Asked Questions Unvented Cylinders

Areas We Cover

Here are the main service areas we cover. If your area isn’t listed here, please get in touch to check.

Book Your Unvented Cylinder Job Online 24/7

Ready to schedule your unvented cylinder service?
Book your appointment online in just a few clicks through our convenient booking system.

Book your appointment now to secure your preferred date and time.

Our online booking platform is available 24/7, allowing you to schedule at your convenience.

Once booked, you’ll receive instant confirmation and a real-time tracking link on the day of service.

About Us

Experience and expertise are the cornerstones of Thames Boilers, founded in 2017 by George Lane after relocating from Essex to Greenhithe, Kent.

With over 25 years in the heating industry, we’ve established our reputation by providing reliable, professional service to homeowners throughout Kent.

We’re not your typical heating company—we’ve embraced modern technology to simplify your life. Our online booking system allows you to schedule appointments 24/7, and we’ll send you real-time tracking updates when we’re on our way to your home. No more guessing when we’ll arrive!

We specialise exclusively in domestic gas boilers, which means we’re experts in what we do. You won’t find us working on commercial systems or alternative fuel types—we stick to what we know best.

We collaborate with major brands like Vaillant, Worcester Bosch, and Viessmann, ensuring your home’s heating system is in capable hands.

What truly sets us apart is our personal touch. As a small, local business, we take pride in building lasting relationships with our customers. We’re here to provide honest advice and reliable service, without any pushy sales tactics.