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Introduction
Unvented hot water systems are a quickly growing market in the UK because they provide high-pressure water and are compatible with many different energy sources.
In fact, based on the government’s Future Homes and Building Standard in 2025, unvented cylinders must work with renewable sources, such as solar power and heat pumps.
But where can you find unvented hot water systems? How much do they cost?
If you want the answers to these questions, you’re in the right place.
In this guide, you’ll find out everything you need to know about unvented hot water systems, including what exactly they are and where they can be found.
Ready? Let’s go!
What’s in this guide?
Top 10 Unvented Hot water System Suppliers
1. Heatrae Sadia
Type: Boiler manufacturer
Pricing: £670 – £2,000+
Trustpilot Rating: 1.7/5
Heatrae Sadia is one of the leading suppliers of unvented hot water systems in the UK, supplied by many popular names, such as Travis Perkins, Jewsons and City Plumbing Supplies.
They provide various unvented hot water systems, depending on various factors, such as the size of your home and the space you have.
With prices that range from £600 up to £2,000+, there’s a Heatrae Sadia system for any budget.
2. Telford Group
Type: Boiler manufacturer
Pricing: £400 – £900
Trustpilot Rating: 4.3/5
The Telford Group was founded in 1989, but they have been producing and selling stainless steel unvented hot water systems since 2002.
They choose to use thicker steel than other alternatives because of its higher quality. In addition, recent standards are calling for the use of more robust materials.
With costs that start from around £400, these unvented hot water systems are budget-friendly.
3. Gledhill
Type: Boiler manufacturer
Pricing: £400 – £1,200
Trustpilot Rating: 4.6/5
Gledhill is a company that has a history which spans back to the early 1900s, when Norman and Joe Gledhill started manufacturing copper cylinders in Blackpool.
Now, they produce both vented and unvented cylinders for domestic and commercial use, made from fine stainless steel. In some cases, you could even design a bespoke cylinder for your business.
Gledhill’s unvented cylinders start from around £400.
4. Kingspan
Type: Boiler manufacturer
Pricing: From £300+
Trustpilot Rating: 1.5/5
Kingspan offers a wide range of unvented hot water cylinders, from simple to premium versions with electric immersion heaters or cylinders that use solar thermal systems.
You can purchase your Kingspan boiler from many retailers, such as Travis Perkins, Richmond’s, PlumbNation and Nicholls to name a few.
5. RM Cylinders
Type: Boiler manufacturer
Pricing: From £480
Trustpilot Rating: 3.7/5
RM Cylinders has less of a history than many of the other boiler or hot water cylinder manufacturers, but they are still one of the leading names in this industry.
Having made their first cylinder with this name just over 10 years ago, RM Cylinders offers many different types of unvented cylinders, such as horizontal, stelflow, slimline, and homeflow.
6. Everflo Cylinders
Type: Boiler manufacturer
Pricing: £350+
Mr Central Heating Score: 4.7/5
Everflo Cylinders offers a wide range of hot water cylinders, such as those that are system fit and pre-plumbed. They also have direct and indirect options.
These cylinders range from being horizontal to slim-fit, which can cater to the needs of your house, such as space savings and budgeting.
7. Ideal Boilers
Type: Boiler manufacturer
Pricing: £500+
Trustpilot Rating: 4.8/5
Ideal Boilers is an award-winning company that doesn’t just specialise in boilers but also a variety of hot water cylinders, which could be an excellent fit for you and your home.
There are many features and benefits to choosing Ideal, such as a 25-year warranty, sizes of up to 400 litres, mains pressure hot water. Plus, their cylinders won’t require a large amount of space.
8. UV Gold 2
Type: Boiler manufacturer
Pricing: £355+
UV Gold 2 is a boiler and hot water cylinder manufacturer that provides a range of cylinders, such as those who are system fit, pre-plumbed, as well as direct and indirect solutions.
The capacities range from 90 to 500 litres, which means that there is a size available for you regardless of the size of your home or business.
These cylinders are an excellent fit for both domestic and commercial uses.
9. Vaillant
Type: Home cover
Pricing: £615+
Trustpilot Rating: 4.4/5
Vaillant offers a wide range of products and services, such as annual boiler service, conventional and combination boilers, and air source pumps.
Boiler and cylinder services can help ensure your boiler or cylinder is safe. Moreover, you can avoid any future problems that could cause your boiler to break down, as well as increase the life of your cylinder.
10. Worcester-Bosch
Type: Boiler supplier
Pricing: £700+
Trustpilot Rating: 4.6/5
Worcester-Bosch is one of the most well-known names in the UK when it comes to boilers or hot water cylinders. With the wide variety of choices on offer, customers have many high-quality options.
They have annual boiler checks that allow you to better maintain your boiler for only £90, which includes service and repairs by Gas Safe-registered engineers, and access to a 24/7 contact centre.
FAQ
What is an unvented hot water system?
An unvented hot water system is made up of a hot water cylinder, which can ensure that you can have hot water delivered at the same pressure as your mains because it is fed directly from that feed.
This method can significantly improve the quality of both your bath and your shower.
Unvented water systems don’t traditionally require a cold water storage tank, which can give you a space-saving solution when you are stretched for room.
If you are eco-conscious, you could benefit from being able to combine your hot water system with a heat pump, or when using biomass or solar energy.
How much do unvented hot water systems cost?
Unvented hot water systems can vary hugely in terms of price, which will usually depend on factors like the size of your cylinder, and its capacity and quality.
The more expensive and top-of-the-range hot water systems can cost upwards of several thousand pounds, while the cheapest could cost as little as £300.
What does it cost to install an unvented hot water system?
Generally speaking, you should expect to pay between £400 and £1,300 for the installation of your unvented hot water system, depending on the complexity of the situation.
What is the difference between vented and unvented systems?
With an unvented hot water system, it takes the water directly from your mains, which means you can get water at a much better pressure from one of these systems.
This is why baths and showers are more successful with an unvented system.
However, vented systems are known to be cheaper than the alternatives, thanks to the fact that they are easier to install and run.
What are the benefits of having an unvented system?
✔ Takes water directly from your mains.
✔ Better access to water pressure.
✔ It doesn’t require a cold water storage tank.
✔ They can be used with renewable energy sources.
✔ These systems come with safety mechanisms.
What size unvented cylinder do I need?
The cylinder size you need depends on the size of your home, so let’s take a look at some examples. While your circumstances might be slightly different, you can still use this guide to give you a rough idea.
Installation | Indirect Hot Water Cylinders | Direct Hot Water Cylinders |
| 1 Bedroom + Bath/Shower | 75/120 | 120/150 |
| 2 Bedroom + Bath/Shower | 150 | 180 |
| 3 Bedroom + 2 Baths/Shower | 180 | 210 |
| 4 Bedroom + 2 Baths/Shower | 210/250 | 250/300 |
| Larger Properties | 300+ | 300+ |
What is the life expectancy of a hot water cylinder?
A traditional hot water cylinder can last between 20 and 40 years.
Conclusion
Unvented hot water systems are compatible with many different energy sources and have several benefits for customers, like high water pressure and space-saving efficiency.
Have you learnt everything you need to know about unvented hot water systems?
Do you want to learn more about hot water cylinders or boilers?
Take a look at the Ecopreneurist guides here, or fill out the form at the top of the page to check out your available options right now.
