What’s the right
Mixergy tank
for you?

Mixergy tanks come in a range of sizes and configurations so that they can be tailored to
suit the individual needs of your home.

Step 1

Do you need a vented or unvented tank?

A vented tank takes its cold water feed from a separate header tank which is usually located in the loft. The header tank provides a natural gravitational force of water to the system, enabling it to provide a flow of hot water to the taps throughout the home.

Vented tanks are known as a more traditional way to supply hot water, and can sometimes give poor performance in terms of water pressure depending on the height difference between the header tank and the tap outlets. For example, the water pressure to upstairs taps could be weaker than that to those downstairs.

If you are looking to replace an old vented tank, a like-for-like replacement with a vented Mixergy tank will provide the easiest and cost-effective solution rather than paying for an upgrade to an unvented system.

Unvented tanks use mains cold water supply and not a header tank in the loft. This provides a better pressure performance with higher flow rates and means there is no need for a separate header tank in the loft. Unvented systems can support multiple hot water outlets at the same time, making them ideal for homes with multiple bathrooms or where there is both a kitchen and utility room.


Mixergy tanks are available as both vented and unvented systems.

Step 2

Direct or indirect

What energy source are you connecting to?

Both our Mixergy X and Solar X can connect with your gas or oil boiler.

If you wish to include gas in your set-up, then you’ll need an Indirect cylinder. If your home is already gas-free (electric boilers and heat pumps), you’ll need Direct.

Connecting with Solar

Our Solar X comes with our embedded Solar PV Diverter and is the ideal solution to store the excess energy you normally send back to the grid, saving it for your hot water.

If you already have a third party diverter (such as a MyEnergi MyEddi or Solar iBoost), then you’ll need to select our Mixergy X and add the PV Switch Kit. Our iHP X uses its own indoor heat pump and is currently unavailable with our PV Switch Kit.

Connecting to a heat pump

Our Mixergy X and Solar X are heat pump-ready. So whether you want to connect now or later to an outboard heat pump, your same Mixergy cylinder will be there. Simply add our Heat Pump Kit to your order.

Step 3

What size tank
do you need?

It is important to install the right size of tank to meet the needs of your household. Mixergy tanks are proven to deliver up to 30% more usable hot water when compared to a conventional cylinder*. This means you can actually install a smaller tank with no loss of performance.

The following illustration will help you work out the right size tank for you – from 120 litres to 300 litres.


You should also think about how your hot water needs might change in the future. Think about whether you are planning to grow the size of the family, or perhaps add additional bathrooms in the years ahead.

* National Physical Laboratory accredited

Step 4

Are there are any space restrictions for your tank installation?

Mixergy tanks are also available as a slimline option which have a smaller footprint to height ratio. This might be important where you need to get the tank through a narrow loft hatch or stairway, or fit in a tight airing cupboard. The slimline tanks are available with a capacity of 120 litres to 210 litres and have a diameter of around 480mm compared with the standard diameter of around 580mm.

Full details of cylinder dimensions are provided in our Customer Care section.


Search our Approved Installer Network

Any Installer can install Mixergy. Ask your Installer to source one for you, or search our Approved Installer Network to find one near you.