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What Size Cylinder Do I Need?

1 bedroom, 

1 bathroom

2 bedrooms,

1 bathroom

3 bedrooms,

1 or 2 bathrooms

4 bedrooms,

2 bathrooms

5 bedrooms,

2 or 3 bathrooms

What Size Cylinder Do I Need?

Buying a cylinder which is too small for your needs will mean that you run out of hot water (usually at the most inconvenient time!), and buying one which is too small means you will be unnecessarily heating hot water so your running costs will be higher than they need to be.

There is never a 100% correct number, because although cylinders are usually based upon the number of bathrooms and bedrooms in a house (as we have done above) it’s difficult to predict that your teenage son may spend 30 mins in the shower each morning, or that you have pet dolphins which need constant bathing in luke warm water.

So if there are unusual circumstances which may increase your requirement, then adjust your selection above accordingly, read some of the articles in our Advice Centre (click on these on the right) or give one of our experts a call.

Some of our favourite Direct Cylinders:

Some of our favourite Indirect cylinders:


This page is part of the 'helpmechoosemy...' series which helps you choose exactly the right product, by answering a small number of simple questions. Using these pages will lead you to an appropriate selection of hand dryers, water heaters, or boiling water products so you can make your final choice. Along the way, you will find links to our Advice Centre articles which will give you more information about each of the choices you are making, and a lot of information about each of the questions.

Of course if you need any other help or have very specific requirements, our experts are always on hand to get you the right answer, and to suggest different brands which may represent better value for money. So don't be shy about giving them a call or selecting the option on the bottom left of the screen to get us to call you back.