We’re Thames Boilers, your trusted local experts for unvented hot water cylinder servicing in Dartford and surrounding areas within 5 miles. Since 2017, we’ve provided expert maintenance for all domestic systems under 350 litres, with over 25 years of industry experience. Our convenient online booking system, real-time engineer tracking, and digital certificates make the process hassle-free. We’re Gas Safe registered and specialise in extending cylinder life while maintaining efficiency. Let’s explore how we can keep your hot water flowing smoothly.
Why Choose Us To Service Your Unvented Hot Water Cylinder In Dartford?

When it comes to servicing your unvented hot water cylinder in Dartford, we acknowledge that you need a reliable, experienced professional who’ll get the job done right. Our team is dedicated to providing top-quality heating services in Dartford, ensuring your system operates efficiently and safely. With years of expertise in unvented systems, you can trust us to handle any repairs or maintenance with precision. Let us help you maintain a comfortable and reliable hot water supply for your home. In addition to our unvented hot water cylinder services, we also specialize in comprehensive boiler repair services in Dartford. Our skilled technicians are equipped to diagnose and resolve any heating issues quickly, minimizing any disruption to your daily routine. Count on us for prompt and efficient solutions that keep your home warm and your hot water flowing seamlessly. In addition to our unvented hot water cylinder and boiler repair services, we also offer Honeywell Evohome installation services to enhance your home’s heating efficiency. Our team can seamlessly integrate this smart heating system, allowing you to control your home’s temperature with ease and flexibility. Experience the perfect blend of comfort and energy savings with our expert installations tailored to meet your needs. In addition to our extensive services, we also provide expert hive-thermostat-installation-in-dartford/”>hive thermostat installation in dartford, offering you smarter control over your heating system. Our knowledgeable technicians can guide you through the setup process, ensuring that you benefit from enhanced convenience and efficiency. Trust us to deliver tailored solutions that optimize your home’s energy usage and keep you comfortable year-round.
With over 25 years in the industry, we grasp the unvented cylinder benefits that make these systems so popular in modern homes – from better water pressure to more efficient heating.
We know how important regular service is for these systems, which is why we take service importance seriously.
As your local experts, we’ll guarantee your cylinder operates safely and efficiently year-round.
Our personalised approach means you’ll always work directly with George, our experienced owner-engineer, who’ll treat your home like his own.
Plus, with our convenient online booking system, scheduling your service couldn’t be easier!
Our team’s G3 certification ensures we’re fully qualified to handle all unvented cylinder installations and repairs with the highest level of expertise.
How It Works

When you’re ready to schedule your unvented cylinder service, simply visit our online booking page and choose a time that works best for you.
Our online booking system makes scheduling quick and convenient, putting you in control of your appointment.
On service day, we’ll send you a text message with a live tracking link so you can watch our engineer’s journey to your home in real-time.
Once we’ve completed the service, we’ll email you a detailed digital certificate right away, giving you instant proof that your cylinder’s been properly maintained.
1. Book Online
Looking to book a service with Thames Boilers? We’ve made online scheduling super easy and convenient.
Our website’s booking system is available 24/7, so you can secure your appointment whenever it suits you best – even if that’s at midnight in your PJs!
Once you’ve chosen your preferred date and time slot, you’ll receive an instant confirmation.
But that’s not all! On the day of service, we’ll send you a text message with a live map link, so you can track our engineer’s location in real-time. No more wondering when we’ll arrive or sitting around waiting all day.
After we complete the service, we’ll email you a detailed digital certificate right away.
It’s that simple – no paperwork, no hassle, just efficient service designed with your convenience in mind.
Our Gas Safe registered engineers specialize in servicing all major brands including Worcester Bosch, Vaillant, and Potterton.
2. On Our Way Text
Thanks to modern technology, we’ve made tracking your engineer’s arrival super simple. Once your appointment is booked, you’ll receive scheduled notifications keeping you in the loop.
On the day of service, we’ll send you a friendly text message with a live tracking link.
Want to know exactly when we’ll arrive? Just click the link in your text, and you’ll see our engineer’s location on a real-time map. No more wondering if we’re stuck in traffic or just around the corner!
You can watch us making our way to your home, complete with an accurate ETA. It’s like having a GPS tracker for your heating engineer – pretty neat, right?
We believe keeping you informed makes the whole experience more relaxing and convenient.
Our engineers are qualified to service all major boiler brands including Vaillant, Worcester Bosch, and Viessmann.
3. Service Your Boiler & Issue Your Certificate
Getting your boiler serviced and certified couldn’t be simpler with our streamlined digital process. When we arrive at your home, we’ll complete your unvented cylinder service with thorough attention to detail, ensuring every component meets safety standards.
We recognise the importance of regular boiler maintenance in keeping your home’s hot water system running smoothly.
Once we’ve finished the service, there’s no waiting around for paperwork. We’ll email your digital certificate right away, documenting that your annual service frequency requirements have been met.
It’s just one more way we’re making cylinder servicing hassle-free for our Kent homeowners. Plus, you’ll have immediate proof of service for your records – no more hunting through drawers for misplaced papers when you need them!
With Gas Safe registration and over 25 years of experience, we ensure every service meets the highest safety and quality standards.
Book Your Dartford Unvented Cylinder Service Online Today

Ready to book your unvented cylinder service in Dartford?
In just a few clicks, you can schedule your appointment at a time that works for you. Simply visit our online booking system at booking.thamesboilers.co.uk to secure your service slot.
Our straightforward booking process takes just minutes, and you’ll receive instant confirmation of your appointment.
While we’re not available for same-day or emergency services, we offer convenient booking slots Monday through Friday, 9am to 5pm.
Our Gas Safe registered engineers bring over 25 years of experience to every service call.
Book your professional unvented cylinder service with Thames Boilers today and guarantee your hot water system stays in top condition.
Customer Reviews

See what our Thames Boiler customers have to say about our unvented cylinder servicing.
Benefits of Servicing Your Unvented Cylinder

Regular servicing of your unvented hot water cylinder protects your investment and helps prevent costly breakdowns.
We’ve seen how proper unvented maintenance tips can extend your cylinder’s lifespan, while keeping your energy bills in check – something we all appreciate in these times!
When you’re part of our cylinder efficiency improvements programme, you’ll enjoy consistent hot water performance and peace of mind.
Our maintenance checks guarantee your system’s temperature and pressure relief valves are working correctly, preventing those dreaded cold showers on winter mornings.
Plus, we’ll clean out any limescale buildup that could affect your cylinder’s efficiency.
We’ll also inspect all safety devices and replace the sacrificial anode if needed, which helps protect your cylinder from corrosion.
It’s like giving your hot water system a spa day – everyone needs a bit of TLC!
With over 25 years of experience in the heating industry, our Gas Safe registered engineers ensure your cylinder maintenance meets the highest safety standards.
Unvented Cylinder Repairs In Dartford

When your unvented cylinder starts acting up in Dartford, we’re here to diagnose and fix the problem quickly.
We commonly see issues that affect unvented cylinder efficiency, like water dripping from overflow pipes or fluctuating hot water pressure. These problems might seem minor at first, but they can signal bigger issues that need attention.
If you’re experiencing no hot water, it’s often due to a tripped overheat thermostat that needs resetting.
Other common repair issues we tackle include faulty pressure relief valves, expansion vessel problems, and malfunctioning motorised valves.
We’ll get to the root of the problem and fix it right the first time.
Unvented Cylinder Brands We Can Service in Dartford

As specialists in unvented cylinder maintenance, we’re equipped to service all major brands available in Dartford.
We regularly work with popular manufacturers like Heatrae Sadia, known for their reliable Megaflo range with exceptional flow rates and standout features that keep your hot water running smoothly.
We’re also well-versed in servicing Gledhill systems, which are celebrated for their superior insulation and quick heat recovery.
But that’s not all – our expertise extends to other trusted names like Telford, Vaillant, and Viessmann cylinders.
Whether you have a Stelflow from RM Cylinders or a robust Kingspan unit, we’ve got you taken care of.
Each brand has its unique characteristics, and we’re thoroughly trained to handle them all with the same level of care and attention to detail.
All our engineers are Gas Safe registered to ensure your unvented cylinder servicing meets the highest safety standards and regulations.
Frequently Asked Questions About Unvented Hot Water Cylinder Servicing in Dartford

We understand you’ve got questions about unvented cylinder servicing, and we’re here to clear things up.
While a service won’t fix existing problems (you’ll need a repair for that), it’s crucial to understand that servicing helps prevent future issues and keeps your cylinder running safely.
What’s more, you’ll want a qualified engineer with G3 certification working on your cylinder, and we’re happy to combine your cylinder service with a boiler service to save you time and money.
With over 25 years of expertise in heating systems, our engineers deliver reliable and comprehensive cylinder servicing solutions.
Will a service fix any problems with my unvented cylinder?
Many homeowners hope that a standard service will resolve existing problems with their unvented cylinder, but that’s not quite how it works.
While we recognise the wishful thinking, there are important service limitations to grasp.
A cylinder service is like an annual health check-up – it’s about preventive maintenance, not fixing existing issues. During a service, we’ll thoroughly inspect your system, check safety devices, and verify everything’s working as it should be.
However, if your cylinder already has problems, you’ll need to book a separate repair visit.
We recommend booking a repair appointment instead if you’re experiencing issues like no hot water, strange noises, or leaks.
This way, we’ll come prepared with the right parts and tools to properly fix what’s wrong.
If my unvented cylinder develops a fault after a service, do I need to pay for another visit?
When your unvented cylinder develops a fault after we’ve completed a service, you’ll need to pay for another visit. Just like your car’s annual service doesn’t prevent future breakdowns, an unvented cylinder maintenance check can’t guarantee against future issues.
While we thoroughly inspect and test all components during servicing, new faults can develop at any time.
Think of it this way: your annual service is like a health check-up, whereas fault diagnosis is more like visiting the doctor when you’re actually sick. They’re two different things!
It’s understood that it can be frustrating when problems arise shortly after a service, but rest assured, we’ll be here to help diagnose and fix any issues that pop up.
Our goal is keeping your hot water flowing reliably, whatever it takes.
Is a Megaflo an unvented hot water cylinder?
Yes, Megaflo is indeed a popular brand of unvented hot water cylinder – you’ll often hear people use “Megaflo” as a general term for these systems, much like how folks say “Hoover” for vacuum cleaners.
We’re big fans of Megaflo benefits, particularly their reputation for excellent build quality and reliable performance.
The unvented efficiency of these cylinders means you’ll get strong water pressure throughout your home, perfect for those invigorating morning showers.
At Thames Boilers, we’ve worked with countless Megaflo systems across Dartford and know them inside out. Our extensive experience allows us to troubleshoot and optimize these systems efficiently. Whether it’s routine maintenance or urgent repairs, our team is committed to providing top-notch boiler servicing in Dartford. You can trust us to ensure your Megaflo system operates at peak performance, keeping your home comfortable and energy-efficient.
Do you need special qualifications to work on unvented cylinders?
A qualified G3 certification is absolutely essential for any engineer working on unvented hot water cylinders – it’s not just a nice-to-have, it’s a legal requirement.
At Thames Boilers, we take unvented cylinder qualifications seriously because these systems operate under high pressure and need expert handling.
While all our engineers are Gas Safe registered, we’ve also invested in specialised G3 certification training to guarantee we can safely work on your unvented cylinder.
It’s worth noting that not every heating engineer has this qualification, even if they’re Gas Safe registered.
The G3 certification importance can’t be overstated – it’s what guarantees your hot water system is maintained safely and correctly.
When you choose us, you’re choosing engineers who meet all legal requirements and safety standards.
Can you service my boiler at the same time?
Many of our customers find it convenient to schedule their boiler and unvented cylinder services together, which we’re happy to accommodate.
We recognise that maintaining both systems is essential for your home’s comfort and efficiency, so we’ve made it easy to book both services in one visit.
When you choose to combine these services, you’ll save time.
Having both systems serviced simultaneously helps guarantee maximum boiler efficiency and gives you peace of mind that your entire heating system is working perfectly.
Visit our website to check our service scheduling options.
We’ll help keep your home’s heating system running smoothly year-round.
How much does an unvented cylinder service cost?
Looking for specific pricing details about unvented cylinder servicing?
We know you want to understand the costs upfront, and we’re all about transparency.
While we’d love to list our prices here, they can change with market conditions, so we always keep our current rates updated on our pricing page at thamesboilers.co.uk/prices.
What we can tell you is that regular servicing brings plenty of unvented benefits, including improved efficiency and longer system life.
The recommended servicing frequency is once a year to keep your cylinder running safely and efficiently.
When you’re ready to book, just visit our website to check our latest rates and schedule your service.
How much does an unvented cylinder repair cost?
Repair costs for unvented cylinders can be tricky to pin down without a proper diagnosis.
If you’re concerned about potential repair expenses, we’d love to help you understand the repair process and what influences the final cost.
For detailed pricing information, we invite you to check out our prices page on our website.
The cost factors typically depend on what needs fixing – whether it’s a faulty valve, thermostat, or another component.
While we can’t provide exact costs here, we want you to know that we’re committed to transparent pricing and honest advice.
Rest assured, we’ve worked on virtually every type of domestic unvented cylinder (except those over 350 litres), so you’re in experienced hands.
My make of cylinder isn’t listed – can you still work on it?
Whether your unvented cylinder is a lesser-known brand or a model you don’t see mentioned on our website, we’re fully equipped to service and repair it.
Our cylinder compatibility extends to all domestic unvented hot water systems under 350 litres, giving you peace of mind about our servicing options.
We’ve worked with countless different makes and models over our years in business, and there’s a good chance we’ve already serviced one just like yours.
The only cylinders we don’t work with are commercial units or those exceeding 350 litres in capacity.
Since we hold the necessary G3 unvented hot water cylinder qualification, you can trust us with your system, regardless of its brand.
Just give us a call or book online, and we’ll take care of your cylinder servicing needs.
About Thames Boilers

Thames Boilers stands as a trusted local heating company serving homeowners across North and Mid Kent since 2017.
We’ve built our reputation on providing exceptional customer satisfaction through personalised service and expert workmanship. Our founder, George Lane, brings over 25 years of heating industry experience to every job we undertake.
We’re proud to be your neighbours, and we recognise the unique heating needs of homes in our community.
That’s why we’ve made it easy to work with us – you can book appointments online anytime, and we’ll send you real-time tracking updates when we’re on our way.
As a Gas Safe registered company, we focus exclusively on domestic gas boilers, allowing us to specialise in what we do best: keeping your home warm and comfortable.
We Cover Dartford And The Surrounding Area

We provide unvented hot water cylinder servicing across Dartford and neighbouring communities within a 5-mile radius, including:
- Crayford
- Stone
- Bean
- Wilmington
- Bexley
- Barnehurst
- Greenhithe
- Swanscombe
- Longfield
- Northfleet
- Southfleet
- New Barn
- Joydens Wood
- Darenth
- Stone Crossing
- Temple Hill
- Sutton-at-Hone
- Hawley
Our service area covers both residential and commercial properties throughout these locations, ensuring reliable unvented cylinder maintenance for local homes and businesses.
Book Your Dartford Unvented Cylinder Service Online Today

Ready to schedule your unvented cylinder service in Dartford?
Book your appointment instantly through our convenient online booking system. Simply click here to book your service or call us on 01322 788418 during business hours.
Our online booking platform is available 24/7, allowing you to secure your preferred appointment time at your convenience.
When you book, 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.