EPH Controls IMC Immersion Controller | Off-Peak Tariff | 7-Day | Boost | PIN Lock | Single/Dual/Twin Element
EPH Controls IMC Immersion Controller | Off-Peak Tariff | 7-Day | Boost | PIN Lock | Single/Dual/Twin Element
MPN: IMC Single / Dual / Twin Element Off-Peak Tariff Ready 7-Day Programming Boost Function Landlord PIN Lock 230V / 13A / IP20
The EPH Controls IMC Immersion Controller is a digital time-switch designed to control immersion heaters in domestic hot water cylinders — replacing older E7 (Electronic 7) timer units with a modern, feature-rich controller. Compatible with single, dual, and twin element 3kW immersion heaters, the IMC is designed specifically to take advantage of off-peak electricity tariffs (such as Economy 7 or Octopus Go) by scheduling the immersion heater to run during cheaper overnight or off-peak periods.
The IMC offers flexible 24-hour, 5/2 day, or 7-day individual day programming with up to 3 on/off periods per day, an instant BOOST function for quick heating on demand (30 min, 1 hr, 2 hr, or 3 hr), automatic summer/winter time adjustment, a Holiday function, keypad lock, and an optional PIN lock for landlord applications. A white-backlit LCD display provides clear visibility of settings and programme status. Supplied with its own surface mounting box and compatible with standard single or double gang flush back boxes — a direct replacement for most existing immersion heater timers.
Key Features
Technical Specifications
| Specification | IMC Detail |
|---|---|
| MPN | IMC |
| Power Supply | 230V~ 50Hz |
| Power Consumption | 10mA |
| Contact Rating | 230V~, 50Hz, max 13A resistive |
| Compatible Immersion Heaters | Single element, dual element, twin element (3kW) |
| Dimensions (H × W × D) | 170mm × 116mm × 63mm |
| Programming Modes | 24-Hour / 5-2 Day / 7-Day individual |
| Periods per Day | Up to 3 on/off periods |
| Boost Durations | 30 min / 1 hr / 2 hr / 3 hr |
| Ambient Temperature Range | 0°C to 45°C |
| Humidity Range | 5–95% RH |
| IP Rating | IP20 |
| Display | White backlit LCD |
| Battery | LIR2032 (for memory backup) |
| Memory Backup | Internal |
| Auto Time Adjust | Automatic BST/GMT summer/winter changeover |
| PIN Lock | Yes — optional landlord PIN lock |
| Holiday Mode | Yes |
| Mounting | Supplied with surface box; compatible with single or double gang flush back box |
| Standards | EN 60730-1, EN 60730-2-7; UKCA marked |
| Impulse Voltage Rating | 2kV (per EN60730) |
| Automatic Action Type | 1C |
| Brand | EPH Controls |
Frequently Asked Questions
Will the IMC replace my existing Economy 7 timer?
Yes — the EPH IMC is designed as a direct replacement for existing Electronic 7 (E7) immersion heater controller units. It is compatible with standard back boxes (single or double gang flush) and comes with its own surface mounting box for new installations. No rewiring is required in most replacement scenarios — simply swap out the old controller and wire the IMC to the existing terminals following the wiring diagram supplied with the unit.
How does the IMC work with dual element immersion heaters?
A dual or twin element immersion heater has two separate heating elements — typically a short "boost" element at the top of the cylinder and a long "overnight/off-peak" element that heats the full cylinder. The IMC can be wired to control both elements independently: Terminal 4 is for the boost (short) element and Terminal 5 for the timed/off-peak (long) element. The wiring diagram on page 8 of the installation guide shows the correct configuration. Refer to the guide carefully for dual element installations.
Can the IMC be used with Economy 7 (E7) and similar tariffs?
Yes — this is its primary design purpose. Programme the timed schedule to run the immersion heater during your off-peak tariff window (e.g. 00:30–07:30 for a typical E7 overnight period), and the unit will heat your cylinder using low-cost electricity overnight. Use the Boost function during the day for top-up heating when required. Over a year, this scheduling approach can generate significant electricity cost savings compared to running the immersion heater on a standard rate tariff.
What does the PIN lock do — does it prevent the Boost button from working?
The PIN lock function prevents changes to the programmed settings — so tenants or building users cannot alter the scheduled heating times. However, the Boost button can typically still be used to add on-demand hot water without unlocking the PIN — this is by design, as users should still be able to get hot water when needed. The PIN lock is specifically for protecting the programming from being changed, not for restricting all operation.
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EPH Controls IMC Immersion Controller | Off-Peak Tariff | 7-Day | Boost | PIN Lock | Single/Dual/Twin Element
MPN: IMC Single / Dual / Twin Element Off-Peak Tariff Ready 7-Day Programming Boost Function Landlord PIN Lock 230V / 13A / IP20
The EPH Controls IMC Immersion Controller is a digital time-switch designed to control immersion heaters in domestic hot water cylinders — replacing older E7 (Electronic 7) timer units with a modern, feature-rich controller. Compatible with single, dual, and twin element 3kW immersion heaters, the IMC is designed specifically to take advantage of off-peak electricity tariffs (such as Economy 7 or Octopus Go) by scheduling the immersion heater to run during cheaper overnight or off-peak periods.
The IMC offers flexible 24-hour, 5/2 day, or 7-day individual day programming with up to 3 on/off periods per day, an instant BOOST function for quick heating on demand (30 min, 1 hr, 2 hr, or 3 hr), automatic summer/winter time adjustment, a Holiday function, keypad lock, and an optional PIN lock for landlord applications. A white-backlit LCD display provides clear visibility of settings and programme status. Supplied with its own surface mounting box and compatible with standard single or double gang flush back boxes — a direct replacement for most existing immersion heater timers.
Key Features
Technical Specifications
| Specification | IMC Detail |
|---|---|
| MPN | IMC |
| Power Supply | 230V~ 50Hz |
| Power Consumption | 10mA |
| Contact Rating | 230V~, 50Hz, max 13A resistive |
| Compatible Immersion Heaters | Single element, dual element, twin element (3kW) |
| Dimensions (H × W × D) | 170mm × 116mm × 63mm |
| Programming Modes | 24-Hour / 5-2 Day / 7-Day individual |
| Periods per Day | Up to 3 on/off periods |
| Boost Durations | 30 min / 1 hr / 2 hr / 3 hr |
| Ambient Temperature Range | 0°C to 45°C |
| Humidity Range | 5–95% RH |
| IP Rating | IP20 |
| Display | White backlit LCD |
| Battery | LIR2032 (for memory backup) |
| Memory Backup | Internal |
| Auto Time Adjust | Automatic BST/GMT summer/winter changeover |
| PIN Lock | Yes — optional landlord PIN lock |
| Holiday Mode | Yes |
| Mounting | Supplied with surface box; compatible with single or double gang flush back box |
| Standards | EN 60730-1, EN 60730-2-7; UKCA marked |
| Impulse Voltage Rating | 2kV (per EN60730) |
| Automatic Action Type | 1C |
| Brand | EPH Controls |
Frequently Asked Questions
Will the IMC replace my existing Economy 7 timer?
Yes — the EPH IMC is designed as a direct replacement for existing Electronic 7 (E7) immersion heater controller units. It is compatible with standard back boxes (single or double gang flush) and comes with its own surface mounting box for new installations. No rewiring is required in most replacement scenarios — simply swap out the old controller and wire the IMC to the existing terminals following the wiring diagram supplied with the unit.
How does the IMC work with dual element immersion heaters?
A dual or twin element immersion heater has two separate heating elements — typically a short "boost" element at the top of the cylinder and a long "overnight/off-peak" element that heats the full cylinder. The IMC can be wired to control both elements independently: Terminal 4 is for the boost (short) element and Terminal 5 for the timed/off-peak (long) element. The wiring diagram on page 8 of the installation guide shows the correct configuration. Refer to the guide carefully for dual element installations.
Can the IMC be used with Economy 7 (E7) and similar tariffs?
Yes — this is its primary design purpose. Programme the timed schedule to run the immersion heater during your off-peak tariff window (e.g. 00:30–07:30 for a typical E7 overnight period), and the unit will heat your cylinder using low-cost electricity overnight. Use the Boost function during the day for top-up heating when required. Over a year, this scheduling approach can generate significant electricity cost savings compared to running the immersion heater on a standard rate tariff.
What does the PIN lock do — does it prevent the Boost button from working?
The PIN lock function prevents changes to the programmed settings — so tenants or building users cannot alter the scheduled heating times. However, the Boost button can typically still be used to add on-demand hot water without unlocking the PIN — this is by design, as users should still be able to get hot water when needed. The PIN lock is specifically for protecting the programming from being changed, not for restricting all operation.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
MPN: IMC Single / Dual / Twin Element Off-Peak Tariff Ready 7-Day Programming Boost Function Landlord PIN Lock 230V / 13A / IP20
The EPH Controls IMC Immersion Controller is a digital time-switch designed to control immersion heaters in domestic hot water cylinders — replacing older E7 (Electronic 7) timer units with a modern, feature-rich controller. Compatible with single, dual, and twin element 3kW immersion heaters, the IMC is designed specifically to take advantage of off-peak electricity tariffs (such as Economy 7 or Octopus Go) by scheduling the immersion heater to run during cheaper overnight or off-peak periods.
The IMC offers flexible 24-hour, 5/2 day, or 7-day individual day programming with up to 3 on/off periods per day, an instant BOOST function for quick heating on demand (30 min, 1 hr, 2 hr, or 3 hr), automatic summer/winter time adjustment, a Holiday function, keypad lock, and an optional PIN lock for landlord applications. A white-backlit LCD display provides clear visibility of settings and programme status. Supplied with its own surface mounting box and compatible with standard single or double gang flush back boxes — a direct replacement for most existing immersion heater timers.
Key Features
Technical Specifications
| Specification | IMC Detail |
|---|---|
| MPN | IMC |
| Power Supply | 230V~ 50Hz |
| Power Consumption | 10mA |
| Contact Rating | 230V~, 50Hz, max 13A resistive |
| Compatible Immersion Heaters | Single element, dual element, twin element (3kW) |
| Dimensions (H × W × D) | 170mm × 116mm × 63mm |
| Programming Modes | 24-Hour / 5-2 Day / 7-Day individual |
| Periods per Day | Up to 3 on/off periods |
| Boost Durations | 30 min / 1 hr / 2 hr / 3 hr |
| Ambient Temperature Range | 0°C to 45°C |
| Humidity Range | 5–95% RH |
| IP Rating | IP20 |
| Display | White backlit LCD |
| Battery | LIR2032 (for memory backup) |
| Memory Backup | Internal |
| Auto Time Adjust | Automatic BST/GMT summer/winter changeover |
| PIN Lock | Yes — optional landlord PIN lock |
| Holiday Mode | Yes |
| Mounting | Supplied with surface box; compatible with single or double gang flush back box |
| Standards | EN 60730-1, EN 60730-2-7; UKCA marked |
| Impulse Voltage Rating | 2kV (per EN60730) |
| Automatic Action Type | 1C |
| Brand | EPH Controls |
Frequently Asked Questions
Will the IMC replace my existing Economy 7 timer?
Yes — the EPH IMC is designed as a direct replacement for existing Electronic 7 (E7) immersion heater controller units. It is compatible with standard back boxes (single or double gang flush) and comes with its own surface mounting box for new installations. No rewiring is required in most replacement scenarios — simply swap out the old controller and wire the IMC to the existing terminals following the wiring diagram supplied with the unit.
How does the IMC work with dual element immersion heaters?
A dual or twin element immersion heater has two separate heating elements — typically a short "boost" element at the top of the cylinder and a long "overnight/off-peak" element that heats the full cylinder. The IMC can be wired to control both elements independently: Terminal 4 is for the boost (short) element and Terminal 5 for the timed/off-peak (long) element. The wiring diagram on page 8 of the installation guide shows the correct configuration. Refer to the guide carefully for dual element installations.
Can the IMC be used with Economy 7 (E7) and similar tariffs?
Yes — this is its primary design purpose. Programme the timed schedule to run the immersion heater during your off-peak tariff window (e.g. 00:30–07:30 for a typical E7 overnight period), and the unit will heat your cylinder using low-cost electricity overnight. Use the Boost function during the day for top-up heating when required. Over a year, this scheduling approach can generate significant electricity cost savings compared to running the immersion heater on a standard rate tariff.
What does the PIN lock do — does it prevent the Boost button from working?
The PIN lock function prevents changes to the programmed settings — so tenants or building users cannot alter the scheduled heating times. However, the Boost button can typically still be used to add on-demand hot water without unlocking the PIN — this is by design, as users should still be able to get hot water when needed. The PIN lock is specifically for protecting the programming from being changed, not for restricting all operation.
