We all like to protect our investments, don’t we? Whether it’s a house or a designer handbag, we like our purchases to last.

If you’ve recently made the decision to install an unvented cylinder in your home, congratulations – you’re soon going to be able to enjoy fantastic water pressure and all the heating and hot water your home will ever need.

However, you’re also going to be making a considerable investment – and that means you’re going to need a decent guarantee.

In this blog post, I’m going to talk about exactly what you can expect from a high-pressure unvented cylinder guarantee.

The length of your guarantee

First, do you want the good news, or the even better news?

Let’s start with the good news; unvented cylinders are extremely simple yet effective products. They’re basically big insulated steel tanks, with not a lot of components in them to go wrong.

This makes for an extremely simple guarantee, and you’ll find most guarantees are pretty much exactly the same for this product.

And because they are so simple, the average length you can expect your unvented cylinder guarantee to last for is 25 years.

Although you can usually expect a guarantee to cover you for 25 years, there is one company called Santon which actually offers a 30-year guarantee.

If possible, pick the same brand

The only other thing you really need to consider when going for an unvented cylinder, is that it’s often best to opt for the same brand as your new boiler.

For instance, if you fit a Worcester Bosch boiler and Worcester Bosch controls, you’ll probably also benefit from a Worcester Bosch cylinder.

This is because Worcester Bosch have their own dedicated engineers who will come out to look at your boiler or cylinder with their own no-quibble guarantee – you might even get a better deal if you buy everything together as part of one package.


Investing in a system boiler with an unvented cylinder can be a pricey investment, which is why you’ll be glad to know that the least you can expect is a 25-year unvented cylinder guarantee. Most guarantees are pretty much going to be identical, however, you might be able to get a 30-year guarantee if you choose a Santon unvented cylinder.

Sometimes, it might make sense to pick the same brand as your boiler if you want to take advantage of dedicated engineers as part of a no-quibble guarantee – this is particularly true when going with Worcester Bosch. You may also get a better deal if you buy everything together as part of one package.