Advanced Features and Settings

This page introduces the advanced features of the Mixergy App, giving you more control and helping you get the most out of your hot water system.

Hot Water Levels

The home screen provides key information about your tank’s current status, including:

• Heating Status – Shows whether your tank is currently heating or not. If it is heating, it will indicate the source of the instruction, such as:
  • A boost (activated via the app or gauge)
  • A user-defined heating schedule
  • A Demand-Side Response (DSR) event
  • A water sterilisation cycle
• Hot Water Level – Displays the percentage of usable hot water in your tank.
  • Example: If the level shows 59%, that means 59% of the water is hot (represented in red on the graph), while 41% is cold (shown in blue).
• Last Update Time – Located below the heating status, this shows when the Mixergy servers last received water measurements from your tank. This can be useful for diagnosing internet connection issues.

Holiday mode

Holiday Mode stops your cylinder from heating while you’re away, temporarily ignoring any existing schedules until your return.

To activate Holiday Mode:

• Go to Schedule in the main menu
• Tap the aeroplane icon at the top of the screen.
• Enter your departure and return dates.
• Confirm your selection, and your cylinder will remain off until the set return date.

This helps save energy and reduce costs while ensuring your tank resumes normal heating when you get back.

Custom Heat Source

If you want to use a different heat source at certain times (e.g. to take advantage of cheaper off-peak electricity), you can:

• Go to Heat source in the main menu
• Tap Add Heat Source.
• Choose the heat source for that time period (Electric or Indirect).
• Set when it should be used.

For example, you might choose electric during off-peak hours (e.g. Economy 7) when electricity is cheaper or gas as the main heat source outside these hours.

Graphs

• Hot Water Level %: The volume of hot water in their cylinder as a percentage on any date.
• Power: Power consumption in kW used daily.
• PV Power: PV Power consumption in kW used daily.

Insights

The insights tab provides usage and cost estimates based on use, household size and energy tariff. 

• Electricity: Energy used on the day in kWh and the cost in £ on their tariff.
• Indirect (gas boiler): Energy used on the day in kWh and the cost in £ on their tariff.
• Energy Usage Over Time: Displays either a seven day or month graph of both electricity and indirect (gas boiler) in kWh used.
• Hot Water Usage Over Time: Displays either a seven day or month graph of hot water used in litres.
• Weekly Summary: Requires the the number of people living in the property.  The summary shows the total energy use in kWh and their efficiency in relation to other Mixergy users.

Set Tariff

Provide detail on your energy tariff and get more from the insights information. You can find this by using the top left hand menu and selecting Automatic Schedule Control or through Insights and tapping 'set tariff' in the bottom right.  

Electricity Tariff

• Peak Electricity Price: Cost per kWh in pence. 
• Off Peak Periods: Time of off peak and price in pence per kWh
• Add Off Peak Time: Start time, end time and price in pence per kWh
• Smart Tariffs: This will be enabled when a smart tariff has been set.
• Choose Smart Tariff: Set a smart tariff from the drop-down list and the area you live.

Indirect (e.g. gas) Tariff:

• Indirect Source: Indirect source either gas or oil
• Gas/Heating Oil Price: Pence per kWh
• Tank Volume: in Litres
• Boiler Efficiency: %

If a smart tariff isn't provided, the cost estimations are based on typical UK electricity and gas tariffs.

Cylinder Settings

To access settings, use the Menu button in the top right corner and select Tank Settings.  

Temperature

• Target Temperature: The following are the recommended target temperatures by cylinder and heat source. 
  • 50°C - 60°C Mixergy X & Solar X when electric or indirect heat source.
  • 45°C - 55°C Mixergy X & Solar X when heat pump heat source
  • 45°C - 55°C iHP X
• Maintain Target Temperature: If the temperature at the top of the cylinder falls more than 5°C below the target temperature, the cylinder will heat until the top temperature reaches the target temperature.

Grid Assistance

• Enable Grid Assistance: A Demand-Side-Response (DSR) feature that helps balance the electrical grid by adjusting power usage when needed.

Automatic Schedule Control

When setting up your Mixergy system, you choose whether to enable Automatic Schedule Control. This feature uses a machine learning algorithm to optimise your schedule based on your hot water usage. If your system is linked to a smart tariff, it will also consider energy pricing to help you save money and use energy more efficiently.

• Automatic Schedule Control options
  • Off: No automatic adjustments. You must manually set your hot water schedule.
  • Grid Assistance Only: Requires a manual schedule but enables Grid Assistance, a Demand-Side-Response (DSR) feature that helps balance the electrical grid by adjusting power usage when needed.
  • Standard (with Grid Assistance): A balanced approach that aims to save money while ensuring you have enough hot water.
  • Economy (with Grid Assistance): Maximises savings but comes with a higher risk of running out of hot water if your usage is higher than expected.
• Automatic Heat Source: This is the heat source that the automatic scheduler would use. This is likely to be the default heat source, but if there is a custom heat source you would prefer, this can be selected here. 
• Adjust Target Temperature: Allows the Auto Schedule Control to reduce the cylinder target temperature to improve the efficiency of indirect heating. It will only do this if an indirect heat source is selected, and the target temperature reduction will be limited to ensure a good hot water temperature is maintained.

Heat Geek Mode

Heat Geek Mode is an advanced setting that aims to maximise energy savings and reduce environmental impact. This mode is only available when Heat Pump is the selected heat source.

How does it work?

• Lowers cylinder temperature to sub-50°C for improved efficiency.
• Adjusts minimum temperature for cylinder reheating to minimise unnecessary heating cycles.
• Takes advantage of machine learning algorithms that adapt to the Heat Geek settings and optimise energy usage based on variable time-of-use tariffs

Enabling and Disabling Cleansing

Cleansing is a Mixergy initiative to prevent legionella growth in their hot water cylinder. This setting is always on in standard settings. When activating Heat Geek Mode, the automatic cleansing feature can be disabled. 

Minimum Output Temperature: This setting changes the lower temperature limit for the cylinder’s state of charge algorithm. The default value is 43°C, but it can be set between 15°C to 50°C. Adjusting this setting can help to: 

• Charge the cylinder to a lower temperature in heat pump mode.
• Deliver hot water at a lower temperature.
• Maximise the storage capacity and reduce cycling frequency.

However, setting this value too close to the target temperature can cause the state of charge to deplete faster due to heat loss.

Cleansing

The cylinder’s controls ensure that it is cleansed effectively. The cylinder will aim to complete a cleansing cycle at least every two weeks.

• Cleansing Temperature: The recommended range depends on the model. We suggest the following:
  • Mixergy X / Solar X: 51°C - 60°C
  • iHP X: 51°C - 55°C
• Cleansing Start: Set time to start cleanse.
• Cleansing Days: Set day/s to cleanse.

Frost Protection

If the water temperature drops below 5°C the cylinder will reheat until the water reaches 15°C throughout. 

Medical Research

The cylinder will use its computing power to perform cutting edge research with the BOINC project.

The BOINC and Science United projects are located at the University of California, Berkeley and are supported by the National Science Foundation. 

PV Diverter Settings

If you have a Mixergy Solar X, you can control how your system uses solar energy. 

• Cut-in Threshold: The minimum power the PV diverter must be producing before it will start heating the cylinder 0w – 500w. Normally set to 0w. Note: If Tesla Batteries are installed it is recommended to set the cut-in threshold to 100w
• PV Charge Limit: The maximum hot water level the cylinder can reach when being heated by the PV diverter 10% - 100%. Normally 10%.
• PV Diverter Target Temperature: The temperature to which the PV diverter can heat the water. This can be higher than the target temperature to optimise solar gain. Off - 60°C if off will be same as target temperature, set to 60°C to optimise solar gain.
• Target Export Current: The PV diverter will be controlled with the aim of maintaining the export current from the premises at this value 0.0A to -1.0A.

PV Diverter Schedule

• Use Spare PV to Heat Tank: When enabled, any spare PV energy will be used to heat the cylinder. By disabling this setting, any spare PV energy will be exported to the grid. Note: Mixergy iHP requires a minimum of 250w available and uses the heat pump to heat the cylinder.
• PV Diverter Start Time: The time at which the PV diverter can start heating the Mixergy cylinder.
• PV Diverter End Time: The time at which the PV diverter will stop heating the Mixergy cylinder. Note: If the PV Diverter Start Time and PV Diverter End Time settings have been set, the Use spare PV to heat tank setting will be ignored.

Graph Setting

• Show Clamp Power Graph: If enabled CT Clamp power in will be visible in the Graphs section.

Need more help?

Call our Homeowners & Residents line:

• Phone: 01865 595 875
• Hours: Monday to Friday, 09:00 – 17:00