More information about our products including finding the right tank for you, compatibility with sources and more.
Installation and maintenance
I am interested in a Mixergy cylinder can I fit it myself?
You will need a plumber or heating installer who is fully qualified and competent to install unvented products. In England and Wales, check that your installer has a G3 qualification. They will be able to provide a registration card to prove they have the necessary qualifications. The equivalent for Scotland is P3 and for Northern Ireland it is P5.
If you are looking for an installer, we recommend using one of our Mixergy Experts. Mixergy Experts are not employed or engaged as contractors by Mixergy. The Mixergy Experts are provided with training on installation and maintenance of our products, and we verify their insurance and certifications. Mixergy cannot accept any responsibility for the work performed by any Mixergy Expert.
Find an Expert on our website.
Do Mixergy cylinders need servicing?
Yes, you need to have your Mixergy hot water cylinder serviced on an annual basis. Whenever a service is carried out, ensure the Service Record book (supplied with your cylinder) is filled out as evidence that the service has been completed. Your cylinder should be serviced by a competent person per the installation and servicing instructions.
Where can I find Installation Instructions and User Manuals for my product?
You can download installation instructions and user manuals on this site.
Where can I find Mixergy product literature?
In addition to the installation and user manuals mentioned above, you can find Mixergy X, Solar X and iHP X datasheets in our datasheets section. Our datasheets provide in-depth technical specifications.
Purchasing a Mixergy Cylinder
How do I find the right cylinder for me?
Mixergy cylinders come in various sizes and configurations to suit the needs of your home. The details you need to consider are outlined in our “What’s the right Mixergy cylinder for you?” section. You can also contact the Mixergy team or a Mixergy Expert, who will happily discuss the options.
Where can I buy a Mixergy Cylinder?
Mixergy cylinders can be purchased on our through our website as well as a wide range of merchant suppliers.
Manufacture and warranty
Where are Mixergy cylinders manufactured?
Mixergy cylinders are proudly manufactured in the UK.
I have registered my cylinder. How many years warranty do I have?
The length of warranty depends on the type of product you have.
- Mixergy X & Mixergy Solar X cylinders - 25 years on the cylinder and 3 years on the components.
- Mixergy iHP cylinders - 25 years on the cylinder, 5 years on the head unit and 3 years on the components.
For more information, see the Warranty Terms & Conditions.
When does the warranty on my cylinder start?
Your Mixergy warranty begins from the date your cylinder was commissioned.
Where can I find the Mixdevice code or QR code to register the warranty for my cylinder?
The Mixdevice and QR codes are printed on the data label located on the cylinder. They can also be found on two dedicated labels on the front and left-hand side of the Mixergy controller.
I have a Mixergy cylinder connected to a gas boiler. Do I need to replace the cylinder if I replace my gas boiler with a heat pump?
No, Mixergy cylinders are designed to work with either a boiler or a heat pump, you will however need the Mixergy Heat Pump Kit.
I have solar PV and would like to replace my existing cylinder with a Mixergy cylinder is this possible?
You have two options if your PV system has a PV diverter you can fit a Mixergy X cylinder along with the Mixergy PV switch which will work in conjunction with your existing PV diverter. Alternatively, if your PV system doesn’t have a PV diverter you can fit a Mixergy Solar X cylinder, which has an embedded solar diverter.
Which PV diverters are Mixergy cylinders compatible with?
Mixergy cylinders are compatible with all common PV diverters such as solar iBoost, immerSUN, and the myenergi eddi. If your system is specified for use with a PV diverter, we will provide a secondary immersion element for the diverter to plug into.
Do Mixergy cylinders work with Smart Energy Tariffs?
Mixergy cylinders are currently the only cylinders on the market which can be ‘Grid-enabled’ for use with smart energy tariffs from your electricity company.
What do I do if I have a technical problem?
If you find there are any issues with your cylinder once it has been installed, please see the User Guide provided with your cylinder or the Homeowner section of this site. You can find information on the Mixergy App and controls and settings or visit the troubleshooting guide.
If you still have a problem, please contact our technical support team through the contact form or call us on 01865 884 343 (select option 3).
What is the purpose of an expansion relief valve in a heating system?
The expansion relief valve is a crucial safety component in a hot water system. Its primary purpose is to protect the system from overpressure conditions that could potentially lead to serious safety hazards. If the pressure within the system exceeds the recommended levels, the relief valve automatically releases excess pressure, preventing damage to the components and ensuring the safety of the entire hot water system.
What is the purpose of a temperature and pressure relief valve?
A Temperature and Pressure Relief Valve, fitted near the top of the cylinder, is required to allow water to be discharged when store temperatures or pressures start approaching unsafe levels. Any water discharged in this way could be very hot.
If this happens turn off the power supply to the heat source (boiler, heat pump or immersion heater). Do not turn off the water until it is running cold.
What is the purpose of the Tundish?
The tundish is installed in the pipe coming from the relief valves and is placed in the pipeline to act as a fault indicator as water flows out of the safety valves under fault conditions.
Can I use more than one heat source to heat my water?
With a Mixergy cylinder, you can heat your water with a range of energy sources: gas or oil boiler, electric, solar PV, solar thermal, or heat pump. Read more about how our cylinders work.
Use our guide to find the right Mixergy cylinder for you.
Can I use a combi boiler to heat my water?
Yes. You will need to plumb the Mixergy cylinder into your central heating loop (i.e. what your radiators connect to). The ‘combi’ part of your boiler would be disconnected, effectively converting the combi boiler into a system boiler.
Can Mixergy cylinders also deliver space heating?
Mixergy cylinders are designed for hot water delivery only. Space heating is generally intended to be provided by either boilers (70-80°C water) or heat pumps (30-45°C water) and use closed water loops. The water in these loops (i.e. your radiators or underfloor heating) is NOT potable and cannot be mixed with the hot water supply that the Mixergy cylinder delivers.
What is a cleansing cycle?
The cleansing cycle runs every two weeks. This sterilisation process will heat the cylinder entirely to 100% to prevent legionella growth.
Does Mixergy offer a service plan?
In addition to the warranty, Mixergy offers the Mixergy Care and Mixergy Care Plus plans. Once your cylinder has been registered, you can purchase these plans through the Mixergy App. Find out more about these plans and the warranty on our website's Warranty and Care plan page.
Transferring ownership of a Mixergy cylinder
If you have recently moved into a property with an existing Mixergy cylinder, are moving home and leaving yours behind or there is a change in circumstances, you may need to change ownership of a cylinder.
To disassociate the existing account, simply press and hold the boost down and power buttons for approximately 15 seconds. This will remove the existing account and enable you to re-register the cylinder.
See the Mixergy App page for more information on registering your cylinder.