Compare Top Boiler Prices & Save 47%

Enter your location and requirement
Top 38+ trusted companies compete
Best 4 custom quotes delivered within 1 hour
100% Free & NO obligation

This site is secure. Privacy policy.

As seen in

Best 10 Unvented Hot Water System Suppliers

Unvented Hot Water Systems


Unvented hot water systems are a quickly growing market in the UK because they are compatible with many different energy sources and provide high-pressure water.

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

Heatrae Sadia

Type: Boiler manufacturer

Pricing: £670+

Google Score: 3.5/5

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 many different unvented hot water systems which might best suit you depending on aspects 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.

Compare Quotes Now

2. Telford Group

Telford Group

Type: Boiler manufacturer

Pricing: £423.16

Google Score: 5/5

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 the higher quality that it can provide their customers, but also 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.

Compare Quotes Now

3. Gledhill


Type: Boiler manufacturer

Pricing: £324.78+

Google Score: 2.8/5

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 and in some cases, you could even design a bespoke cylinder for your business.

Gledhill’s unvented cylinders start from £324.78.

Compare Quotes Now

4. Kingspan


Type: Boiler manufacturer

Pricing: £300+

Trustpilot Score: 2/5

Kingspan offers a wide range of unvented hot water cylinders, from the simple versions to the premium versions with electric immersion heaters, or solar cylinders which 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.

Compare Quotes Now

5. RM Cylinders


Type: Boiler manufacturer

Pricing: £400+

Google Score: 3.6/5

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 ten years ago, RM Cylinders offers their customers many different types of unvented cylinders such as horizontal, stelflow, slimline and homeflow cylinders.

Compare Quotes Now

6. Everflo Cylinders

Everflo Logo

Type: Boiler manufacturer

Pricing: £355.72+

Mr Central Heating Score: 4.7/5

Everflo Cylinders offers their customers a wide range of hot water cylinders, such as those that are system fit, pre-plumbed, direct and indirect options too.

These cylinders range from being horizontal to slim-fit, which gives you an ample opportunity to cater to the needs of your house such as space savings and budgeting.

Compare Quotes Now

7. Ideal Boilers

Ideal Boilers

Type: Boiler manufacturer

Pricing: £517.01

Google Score: 2.2/5

Ideal Boilers are an award-winning company who 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 and you won’t require a large amount of space for your cylinders.

Compare Quotes Now

8. UV Gold 2


Type: Boiler manufacturer

Pricing: £355.72

UV Gold 2 is a boiler and hot water cylinder manufacturer, who provides a range of cylinders such as those who are system fit, pre-plumbed, as well as direct and indirect solutions.

The capacities on offer range from 90 litres 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.

Compare Quotes Now

9. Vaillant


Type: Home cover

Pricing: £615.93

Trustpilot Score: 4/5

Vaillant offers a wide range of products and services for their customers, with an annual boiler service, conventional and combi boilers for sale, and things like an air source pump for example.

Boiler and cylinder services mean that you can make sure that your boiler or cylinder is safe, you can avoid any future problems that could cause your boiler to break down, as well as increasing the life of your cylinder too.

Compare Quotes Now

10. Worcester-Bosch

Worcester Bosch

Type: Boiler supplier

Pricing: £700+

Trustpilot Score: 5/5

Worcester-Bosch is one of the most well-known names in the UK when it comes to things like boilers or hot water cylinders, and 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.

Compare Quotes Now


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 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 the 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 such as the size of your cylinder, as well as 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 £275 and £450 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?

One of the main differences between vented and unvented hot water systems is that 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 size cylinder that you need depends on the size of your home, so let’s take a look at some examples.


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+

While your circumstances might be slightly different, you can still use this guide to give you a rough idea of what size hot water cylinder you might need.

As well as the differences between indirect and direct choices.

What is the life expectancy of a hot water cylinder?

The typical life expectancy of a traditional hot water cylinder is between 20 and 40 years.


In 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 ExpertSure guides here, or fill out the form at the top of the page to check out your available options right now.

Did You Know There Are Over 3000 boiler Installers in the UK? - Finding The Lowest Price is Tough Without Expert Knowledge.

Use Our Smart Service To Compare The Best Quotes & Save 47% Today! Click Your Area to Start.

Filwood Green Business Park
1 Filwood Park Lane

0800 234 3036