1. Controls & Indicators
  2. Display
  3. Operating Modes
  4. Manual Boost
  5. Boost Timer

1. Controls & Indicators


1. Display Graphical LCD display with LED backlight
2. Power On Indicator Illuminates when:
–   Unit is connected to the mains supply and;
–   the BYPASS switch is in the ON position (I)
3. Control Buttons Four tactile buttons used to navigate the menus and alter settings:

Enter menu (from main screen)| Exit current menu

Move up a menu item | Increase value

Move down a menu item | Decrease valueBoost | Select item | Confirm value and move to next setting

4. Heater Output Indicators (1 & 2) Illuminates when the respective heater output (1 or 2) is active

The brightness will vary with the output voltage

If both 1 & 2 are lit together, both heaters are at maximum temperature

5. ON/OFF and BYPASS Switch This switch has three positions:

  • I ON – eddi is on (this is the normal position)
  • 0 OFF – eddi is off (the power on indicator will be off)
  • II BYPASS – eddi is bypassed; the mains supply is directly connected to the Heater 1 output. In this position the Power indicator will be off and the Heater 1 indicator will be illuminated

2. Display


1. Import / Export Power The power being either imported or exported from or to the grid (kW). The direction of the arrows indicate if the property is currently importing power (left) or exporting power (right)
The size of arrows is proportion to the level of power. When the property is neither importing or exporting power, the figure will be 0.0kW and there will be no animated arrows. The property is then said to be ‘in balance’
2. House Load Power The power that the property is currently using in kW
It does not include any surplus power being sent to the heater(s)
Note: This is displayed only when the Generation Sensor is installed (either connected to CT2 input or a harvi device)
3. Operating Mode The current operating mode is displayed here – see Operating Modes
4. Generation Power The power being generated at this time in kW
Note: This is displayed only when the Generation Sensor is installed (either connected to CT2 input or a harvi device)
5. Message Icon When this icon is present there is a message from the myenergi server
This only applies if you have the myenergi hub device
6. Date & Time The current date and time
7. Status Icons These icons indicate that the import limiting is active (house), a relay is on (R1 / R2) or the e-Sense input is live (e)
8. eddi Icon This eddi unit. If there are wavy lines above the icon, the unit is thermally limiting (the output power will be temporarily reduced)
9. Energy Diverted Today The accumulated energy that has been sent to heater(s) today
Only the surplus energy is included
10. Temperature If the optional Relay & Sensor Board (see Relay & Sensor Board) is fitted and temperature probes are installed, the temperature of the active heater is displayed
11. Heater Icon This icon represents the active heater, and next to it is the heater number
12. Power Diverting to Heater When eddi is heating, arrows will show here along with the power in kW


House Consumption – Not Importing
House Consumption – Importing
Solar Generation Power
Wind Generation Power
Grid Power – Import / Export
Power Flow Direction – Small Amount
Power Flow Direction – Medium Amount
Power Flow Direction – Large Amount
Waiting For Surplus Power
Maximum Heater Temperature Reached
eddi Device – Normal
eddi Device – Too Warm (output limited)
Instantaneous Power
Accumulated Energy Today
Heater – Top Immersion
Heater – Bottom Immersion
Heater – Radiator
Heater – Underfloor
Heater – Swimming Pool
Relay – Relay 1
Heat Pump
Message Available
Import Power Limiting Active
Relay 1 or 2 – On
Economy Tariff Electricity Available
Active Heater Number
DSR Mode Active

3. Operating Modes

Waiting for Surplus

eddi is waiting for surplus power from the microgeneration system.
The house in the centre is straight faced as grid electricity is being used by the house (0.8kW is this example).
We can see that eddi hasn’t started heating with surplus power yet today as there is no accumulated energy; the 0.00kWh under the water cylinder symbol.


eddi is now diverting power to the heater.
The heater currently being heated is shown by the icon on the right and the small number (1 in this case) corresponds to the heater number.
The amount of power being diverted at any one moment is shown between the eddi icon and the heater icon (in this screenshot the diverted power is 1.6kW).
All of the surplus energy which has been set to the heater today is displayed under the heater icon (1.30kWh) in this example.
Now the house is smiling because there is no grid electricity being used.

Max Temp Reached

The heater is now at maximum temperature.
Now there are no arrows or power figures for the heater and a thermometer symbol is shown.
As eddi is no longer able to divert the surplus power to the heater and so this is now exported to the grid (0.8kW in this example).
If there is a second heater present (connected to Heater 2), eddi will switch over to start heating Heater 2.


Boosting means eddi is giving maximum power to the heater, irrespective of available surplus power.
The arrows going to the heater are large and the power figure (3.0kW in the example screen) is the heaters’ maximum power level.
During a boost , it is likely that there will be power imported from the grid (2.8kW here).
The timer starts at (1h00m) and will count down until the boost ends. The boost duration may be altered with the or buttons.

4. Manual Boost

A heater can be ‘boosted’ to full power for a short period regardless of the amount of available export power, this function is called Manual Boost and is activated from the main screen. Once the boost starts, the remaining boost period will be displayed, this will start with a duration of 1 hour, this can be adjusted during the boost. The boost can be cancelled at any time.

Activating Manual Boost

1. From the main screen, press
2. If there is more than one heater you may select which heater you wish to boost by pressing or to change heater. Press to start boost
3. The boost duration may be altered by pressing or during the boost

Cancelling Manual Boost

The boost can be cancelled by pressing twice

5. Boost Timer

eddi can be programmed to ‘boost’ the heating for each heater at certain times. Boost, means that the heater will be at full power regardless of the amount of available export power. This means that power may be drawn from the mains grid supply during boost times.
–   There are four editable time slots for each heater
–   Setting the duration to 0h00 will make the boost inactive

Programming Boost Times

1. From the main screen, press to enter Main Menu
2. Select Boost Timer by pressing until the option is highlighted, then press
3. Select the heater you wish to program the boost times for (e.g. Heater 1) and press
4. The BOOST TIMER screen is then shown.
5. The boost can now be edited: Use or buttons to highlight the time slot you wish to change. The screen here shows the start hour being edited:
6. Alter the start hour with the or buttons and then press to move to minutes.
7. Edit the duration in the same way and then press again to edit the days of the week you want the boost to be active for; each day of the week and toggled on/off with or buttons, press to go to the next day. Pressing on the last day (Sunday) will confirm the boost time slot and whole line will be highlighted again.
8. Press to exit the BOOST TIMER screen.

Economy Tariff Boosting

Boosting only when economy rate electricity is available can be achieved in one of three ways:

1. Setting the boost timer to coincide with the economy tariff times. This option should be used only if the electricity meter is a dual-rate meter (modern meters usually are multi-rate).
2. Boost only at set times AND if economy rate electric is available*
3. Automatically boost whenever the economy tariff rate electricity is available, regardless of the boost times*

* Options 2 and 3 are available only when using the eSense input on the Relay & Sensor Board. The Relay & Sensors menu will be available when a Relay & Sensor Board is fitted inside the unit.

For option 2, the eSense Input in the Relay & Sensors menu option should be set to the appropriate Boost Enable setting. With the Boost Enable function set, the BOOST TIMER screen will include an extra column (see screenshot).



The e can be toggled on/off, if e is present, the boost will activate only when the boost times are valid and the economy rate tariff is available.

Alternatively the eSense input can be used to activate the boost whenever the economy tariff rate electricity is available, regardless of boost times (option 3). To do this, the eSense Input in the Relays & Sensors menu should be set to Boost 1, Boost 2 or Boost 1&2. When using this option, the Boost Timer is not needed.

Boost Time Conflicts

Both heaters cannot be active at the same time and so if the boost times are conflicting, the higher priority heater will take precedence – see Priority. If one or more boost times conflict for one heater, the boost will follow the latest time or longest duration.

Cancelling Boost

The boost can be cancelled by pressing twice during a boost.