{"product_id":"eph-controls-imc-immersion-controller-off-peak-tariff-7-day-boost-pin-lock-single-dual-twin-element","title":"EPH Controls IMC Immersion Controller | Off-Peak Tariff | 7-Day | Boost | PIN Lock | Single\/Dual\/Twin Element","description":"\u003cstyle\u003e\n  .eph-desc * { box-sizing: border-box; }\n  .eph-desc { font-family: inherit; color: inherit; line-height: 1.7; font-size: 16px; }\n  .eph-desc p, .eph-desc li, .eph-desc td, .eph-desc th { font-size: 16px !important; }\n  .eph-desc h2 { font-size: 22px !important; font-weight: 700; color: #1a1a00; border-bottom: 2px solid #7a6600; padding-bottom: 6px; margin: 2rem 0 1rem; }\n  .eph-desc h3 { font-size: 17px !important; font-weight: 700; color: #1a1a00; margin: 1.2rem 0 0.4rem; }\n  .eph-desc p { margin: 0 0 1rem; }\n  .eph-desc ul { padding-left: 1.5rem; margin: 0 0 1rem; }\n  .eph-desc ul li { margin-bottom: 0.5rem; }\n  .eph-intro { background: #fffce8; border-left: 4px solid #7a6600; padding: 1.1rem 1.4rem; border-radius: 0 6px 6px 0; margin-bottom: 1.5rem; }\n  .eph-intro p { margin: 0 !important; }\n  .eph-intro p + p { margin-top: 0.75rem !important; }\n  .eph-badge { display: inline-block; background: #7a6600; color: #fff; font-size: 13px !important; font-weight: 700; border-radius: 4px; padding: 2px 10px; margin-right: 6px; margin-bottom: 4px; vertical-align: middle; }\n  .eph-badge.grey { background: #555; }\n  .eph-badge.green { background: #2e6e2e; }\n  .eph-badge.blue { background: #1a5080; }\n  .eph-dim-bar { background: #1a1a00; color: #fff; border-radius: 8px; padding: 1rem 1.4rem; margin: 1.2rem 0; display: flex; flex-wrap: wrap; gap: 1.2rem; align-items: center; justify-content: space-around; }\n  .eph-dim { text-align: center; }\n  .eph-dim .val { font-size: 22px !important; font-weight: 800; color: #f0d060; line-height: 1; }\n  .eph-dim .unit { font-size: 12px !important; color: #f8e090; }\n  .eph-dim .lbl { font-size: 11px !important; color: #ccc; margin-top: 3px; }\n  .eph-feat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 0.85rem; margin-bottom: 1.2rem; }\n  .eph-feat-card { background: #fffdf0; border: 1px solid #d8cc80; border-radius: 6px; padding: 1rem 1.1rem; }\n  .eph-feat-card strong { display: block; color: #1a1a00; margin-bottom: 0.35rem; font-size: 16px !important; }\n  .eph-spec-table { width: 100%; border-collapse: collapse; margin-bottom: 1.2rem; }\n  .eph-spec-table th { background: #7a6600; color: #fff !important; text-align: left; padding: 0.7rem 1rem; font-weight: 600; font-size: 16px !important; }\n  .eph-spec-table td { padding: 0.6rem 1rem; border-bottom: 1px solid #e0e0e0; font-size: 16px !important; }\n  .eph-spec-table tr:nth-child(even) td { background: #fffce8; }\n  .eph-spec-table td:first-child { font-weight: 600; color: #111; width: 42%; }\n  .eph-callout { background: #fffce8; border-left: 4px solid #7a6600; border-radius: 0 6px 6px 0; padding: 1rem 1.3rem; margin: 1.2rem 0; }\n  .eph-callout p { margin: 0 !important; }\n  .eph-callout h3 { margin-top: 0 !important; }\n  .eph-faq-item { border-bottom: 1px solid #e0e0e0; padding: 1rem 0; }\n  .eph-faq-item:last-child { border-bottom: none; }\n  .eph-faq-item p { margin: 0.4rem 0 0 !important; }\n  .eph-infobox { background: #fff8e6; border: 1px solid #f0d080; border-radius: 6px; padding: 1rem 1.2rem; margin-top: 1.5rem; font-size: 16px !important; }\n  @media (max-width: 640px) { .eph-feat-grid { grid-template-columns: 1fr; } }\n\u003c\/style\u003e\n\n\u003cdiv class=\"eph-desc\"\u003e\n  \u003cdiv class=\"eph-intro\"\u003e\n    \u003cp\u003e\n      \u003cspan class=\"eph-badge\"\u003eMPN: IMC\u003c\/span\u003e\n      \u003cspan class=\"eph-badge grey\"\u003eSingle \/ Dual \/ Twin Element\u003c\/span\u003e\n      \u003cspan class=\"eph-badge green\"\u003eOff-Peak Tariff Ready\u003c\/span\u003e\n      \u003cspan class=\"eph-badge blue\"\u003e7-Day Programming\u003c\/span\u003e\n      \u003cspan class=\"eph-badge\"\u003eBoost Function\u003c\/span\u003e\n      \u003cspan class=\"eph-badge grey\"\u003eLandlord PIN Lock\u003c\/span\u003e\n      \u003cspan class=\"eph-badge grey\"\u003e230V \/ 13A \/ IP20\u003c\/span\u003e\n    \u003c\/p\u003e\n    \u003cp style=\"margin-top:0.75rem !important;\"\u003eThe \u003cstrong\u003eEPH Controls IMC Immersion Controller\u003c\/strong\u003e 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 \u003cstrong\u003eoff-peak electricity tariffs\u003c\/strong\u003e (such as Economy 7 or Octopus Go) by scheduling the immersion heater to run during cheaper overnight or off-peak periods.\u003c\/p\u003e\n    \u003cp\u003eThe IMC offers flexible 24-hour, 5\/2 day, or 7-day individual day programming with up to \u003cstrong\u003e3 on\/off periods per day\u003c\/strong\u003e, 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.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"eph-dim-bar\"\u003e\n    \u003cdiv class=\"eph-dim\"\u003e\n\u003cdiv class=\"val\"\u003e230V\u003c\/div\u003e\n\u003cdiv class=\"unit\"\u003e~50Hz\u003c\/div\u003e\n\u003cdiv class=\"lbl\"\u003eSupply\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"eph-dim\"\u003e\n\u003cdiv class=\"val\"\u003e13A\u003c\/div\u003e\n\u003cdiv class=\"unit\"\u003emax resistive\u003c\/div\u003e\n\u003cdiv class=\"lbl\"\u003eContact Rating\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"eph-dim\"\u003e\n\u003cdiv class=\"val\"\u003e3\u003c\/div\u003e\n\u003cdiv class=\"unit\"\u003eperiods\/day\u003c\/div\u003e\n\u003cdiv class=\"lbl\"\u003eMax Programmes\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"eph-dim\"\u003e\n\u003cdiv class=\"val\"\u003e170 × 116 × 63\u003c\/div\u003e\n\u003cdiv class=\"unit\"\u003emm\u003c\/div\u003e\n\u003cdiv class=\"lbl\"\u003eDimensions\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"eph-dim\"\u003e\n\u003cdiv class=\"val\"\u003eIP20\u003c\/div\u003e\n\u003cdiv class=\"unit\"\u003erating\u003c\/div\u003e\n\u003cdiv class=\"lbl\"\u003eProtection\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"eph-dim\"\u003e\n\u003cdiv class=\"val\"\u003e0–45°C\u003c\/div\u003e\n\u003cdiv class=\"unit\"\u003eambient\u003c\/div\u003e\n\u003cdiv class=\"lbl\"\u003eOperating Range\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eKey Features\u003c\/h2\u003e\n  \u003cdiv class=\"eph-feat-grid\"\u003e\n    \u003cdiv class=\"eph-feat-card\"\u003e\n\u003cstrong\u003e💡 Off-Peak Tariff Optimised\u003c\/strong\u003eDesigned to maximise savings from Economy 7, Economy 10, and other time-of-use electricity tariffs. Programme the IMC to heat the cylinder during off-peak overnight hours at lower electricity rates — then use the Boost function for top-up heating during the day if needed.\u003c\/div\u003e\n    \u003cdiv class=\"eph-feat-card\"\u003e\n\u003cstrong\u003e📅 7-Day Individual Day Programming\u003c\/strong\u003eChoose from 24-hour (same programme every day), 5\/2 day (weekday\/weekend split), or full 7-day individual programming — up to 3 on\/off periods per day. Full flexibility to match the household's actual hot water usage pattern across each day of the week.\u003c\/div\u003e\n    \u003cdiv class=\"eph-feat-card\"\u003e\n\u003cstrong\u003e🔥 BOOST Function — 4 Durations\u003c\/strong\u003ePress the dedicated BOOST button for instant on-demand heating — choose 30 minutes, 1 hour, 2 hours, or 3 hours. The unit heats the cylinder for the selected duration, then automatically reverts to the timed programme. LED indicators show when the controller is in timed or boosted demand.\u003c\/div\u003e\n    \u003cdiv class=\"eph-feat-card\"\u003e\n\u003cstrong\u003e🕐 Auto Summer\/Winter Time\u003c\/strong\u003eAutomatically adjusts the clock for British Summer Time (BST) and Greenwich Mean Time (GMT) changes — no manual adjustment needed when the clocks change. This ensures off-peak timing remains accurate without any user intervention.\u003c\/div\u003e\n    \u003cdiv class=\"eph-feat-card\"\u003e\n\u003cstrong\u003e🔒 Landlord PIN Lock\u003c\/strong\u003eAn optional PIN lock function prevents unauthorised changes to the controller's programme settings — particularly useful in rental properties, HMOs, and student lets where tenants should not need to change the immersion heater schedule. The PIN lock is set by the landlord or installer.\u003c\/div\u003e\n    \u003cdiv class=\"eph-feat-card\"\u003e\n\u003cstrong\u003e🛏️ Holiday Function\u003c\/strong\u003eSet the controller to OFF mode for a specified duration using the Holiday Function — the immersion heater will not run during the away period, eliminating unnecessary energy consumption when the property is unoccupied.\u003c\/div\u003e\n    \u003cdiv class=\"eph-feat-card\"\u003e\n\u003cstrong\u003e🔌 Dual Element Control\u003c\/strong\u003eCompatible with single element, dual element, and twin element immersion heaters. For dual\/twin element configurations, the IMC can be wired to control the boost (short element) and timed\/off-peak (long element) circuits independently — correct wiring is detailed in the installation guide included with the unit.\u003c\/div\u003e\n    \u003cdiv class=\"eph-feat-card\"\u003e\n\u003cstrong\u003e🔧 Direct E7 Replacement\u003c\/strong\u003eThe IMC is fully interchangeable with existing Electronic 7 (E7) immersion heater timer units — fits existing back boxes with no need to chase new wiring. Supplied with its own surface mounting box for new installations. A simple drop-in replacement for most existing immersion heater time-switches.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003ctable class=\"eph-spec-table\"\u003e\n    \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eIMC Detail\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMPN\u003c\/td\u003e\n\u003ctd\u003eIMC\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003ePower Supply\u003c\/td\u003e\n\u003ctd\u003e230V~ 50Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e10mA\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eContact Rating\u003c\/td\u003e\n\u003ctd\u003e230V~, 50Hz, max 13A resistive\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCompatible Immersion Heaters\u003c\/td\u003e\n\u003ctd\u003eSingle element, dual element, twin element (3kW)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eDimensions (H × W × D)\u003c\/td\u003e\n\u003ctd\u003e170mm × 116mm × 63mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eProgramming Modes\u003c\/td\u003e\n\u003ctd\u003e24-Hour \/ 5-2 Day \/ 7-Day individual\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003ePeriods per Day\u003c\/td\u003e\n\u003ctd\u003eUp to 3 on\/off periods\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBoost Durations\u003c\/td\u003e\n\u003ctd\u003e30 min \/ 1 hr \/ 2 hr \/ 3 hr\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eAmbient Temperature Range\u003c\/td\u003e\n\u003ctd\u003e0°C to 45°C\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eHumidity Range\u003c\/td\u003e\n\u003ctd\u003e5–95% RH\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eIP Rating\u003c\/td\u003e\n\u003ctd\u003eIP20\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eDisplay\u003c\/td\u003e\n\u003ctd\u003eWhite backlit LCD\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBattery\u003c\/td\u003e\n\u003ctd\u003eLIR2032 (for memory backup)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMemory Backup\u003c\/td\u003e\n\u003ctd\u003eInternal\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eAuto Time Adjust\u003c\/td\u003e\n\u003ctd\u003eAutomatic BST\/GMT summer\/winter changeover\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003ePIN Lock\u003c\/td\u003e\n\u003ctd\u003eYes — optional landlord PIN lock\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eHoliday Mode\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eSupplied with surface box; compatible with single or double gang flush back box\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eStandards\u003c\/td\u003e\n\u003ctd\u003eEN 60730-1, EN 60730-2-7; UKCA marked\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eImpulse Voltage Rating\u003c\/td\u003e\n\u003ctd\u003e2kV (per EN60730)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eAutomatic Action Type\u003c\/td\u003e\n\u003ctd\u003e1C\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eEPH Controls\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"eph-faq-item\"\u003e\n    \u003ch3\u003eWill the IMC replace my existing Economy 7 timer?\u003c\/h3\u003e\n    \u003cp\u003eYes — 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.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"eph-faq-item\"\u003e\n    \u003ch3\u003eHow does the IMC work with dual element immersion heaters?\u003c\/h3\u003e\n    \u003cp\u003eA 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.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"eph-faq-item\"\u003e\n    \u003ch3\u003eCan the IMC be used with Economy 7 (E7) and similar tariffs?\u003c\/h3\u003e\n    \u003cp\u003eYes — 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.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"eph-faq-item\"\u003e\n    \u003ch3\u003eWhat does the PIN lock do — does it prevent the Boost button from working?\u003c\/h3\u003e\n    \u003cp\u003eThe 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.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"eph-infobox\"\u003e\n\u003cstrong\u003e⚠️ Note:\u003c\/strong\u003e Installation must be carried out by a qualified electrician. Isolate mains supply before installation and ensure unit is properly earthed. The IMC is rated at 13A maximum — do not use with immersion heaters greater than 3kW on a single element circuit. Supplied with surface mounting box — compatible with standard single or double gang flush back box. UKCA marked. Conforms to EN 60730-1 and EN 60730-2-7.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"EPH Controls","offers":[{"title":"Default Title","offer_id":63552855376221,"sku":"IMC","price":70.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/IMC-EPH-IMC-Immersion-Controller.jpg?v=1771781971","url":"https:\/\/qualityheating.co.uk\/products\/eph-controls-imc-immersion-controller-off-peak-tariff-7-day-boost-pin-lock-single-dual-twin-element","provider":"AIZO Quality Heating","version":"1.0","type":"link"}