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.
Mixergy tanks are available to work with a range of heat sources. To choose the right tank for you, it is important to confirm the heat source(s) that you intend to use.
Gas or oil boiler
If you are connecting your Mixergy tank to a conventional gas or oil boiler, you need an “indirect” tank.
Electric immersion heater
If you are planning to heat your water using just an immersion heater, you need a “direct” tank.
Solar photovoltaic (PV)
If you want to use electricity generated from solar PV panels to heat your water alongside the main heat source, you need to purchase a separate solar PV kit along with your tank (direct or indirect). More details here.
To connect a solar thermal (or solar water heating) system to your Mixergy tank, we will supply a tank with a solar thermal coil that will operate alongside a conventional boiler or immersion heater. More details here.
For a heat pump system, you need a “direct” tank with an additional plate heat exchanger kit. More details here.
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
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.
Any Installer can install Mixergy. Ask your Installer to source one for you, or search our Approved Installer Network to find one near you.