{"product_id":"engo-ehw-b-wifi-hot-water-timer-with-built-in-thermostat-programmable-dhw-controller-black","title":"ENGO EHW-B WiFi Hot Water Timer with Built-In Thermostat – Programmable DHW Controller | Black","description":"\u003cstyle\u003e\n  .engo-desc * { box-sizing: border-box; }\n  .engo-desc { font-family: inherit; color: inherit; line-height: 1.7; font-size: 16px; }\n  .engo-desc p, .engo-desc li, .engo-desc td, .engo-desc th { font-size: 16px !important; line-height: 1.7; }\n  .engo-desc h2 { font-size: 22px !important; font-weight: 700; color: #1a1a1a; border-bottom: 2px solid #1a1a1a; padding-bottom: 6px; margin: 2rem 0 1rem; line-height: 1.3; }\n  .engo-desc h3 { font-size: 17px !important; font-weight: 700; color: #1a1a1a; margin: 1.2rem 0 0.4rem; line-height: 1.4; }\n  .engo-desc p { margin: 0 0 1rem; }\n  .engo-desc ul { padding-left: 1.5rem; margin: 0 0 1rem; }\n  .engo-desc ul li { margin-bottom: 0.5rem; }\n\n  .engo-intro-box { background: #f5f5f5; border-left: 4px solid #222; padding: 1.1rem 1.4rem; border-radius: 0 6px 6px 0; margin-bottom: 1.5rem; }\n  .engo-intro-box p { margin: 0 !important; }\n\n  .engo-badge { display: inline-block; background: #222; color: #fff; font-size: 13px !important; font-weight: 700; border-radius: 4px; padding: 2px 10px; margin-right: 6px; margin-bottom: 4px; vertical-align: middle; letter-spacing: 0.04em; }\n  .engo-badge.accent { background: #c05a00; }\n  .engo-badge.green { background: #2e7d32; }\n\n  .engo-why-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 0.85rem; margin-bottom: 1.2rem; }\n  .engo-why-card { background: #f9f9f9; border: 1px solid #ddd; border-radius: 6px; padding: 1rem 1.1rem; line-height: 1.6; }\n  .engo-why-card strong { display: block; color: #1a1a1a; margin-bottom: 0.35rem; font-size: 16px !important; }\n\n  .engo-callout { background: #f0f8f0; border: 1px solid #a5d6a7; border-radius: 6px; padding: 1rem 1.3rem; margin: 1.2rem 0; }\n  .engo-callout h3 { margin-top: 0 !important; }\n  .engo-callout p { margin: 0 !important; }\n\n  .engo-callout-blue { background: #f0f4ff; border-left: 4px solid #1a1a1a; border-radius: 0 6px 6px 0; padding: 1rem 1.3rem; margin: 1.2rem 0; }\n  .engo-callout-blue p { margin: 0 !important; }\n\n  .engo-callout-warn { background: #fff8e6; border: 1px solid #f0d080; border-radius: 6px; padding: 1rem 1.2rem; margin: 1.2rem 0; color: #5a4a00; }\n  .engo-callout-warn p { margin: 0 !important; }\n\n  .engo-spec-table { width: 100%; border-collapse: collapse; margin-bottom: 1.2rem; }\n  .engo-spec-table th { background: #222; color: #fff !important; text-align: left; padding: 0.7rem 1rem; font-weight: 600; font-size: 16px !important; }\n  .engo-spec-table td { padding: 0.6rem 1rem; border-bottom: 1px solid #e0e0e0; vertical-align: top; font-size: 16px !important; }\n  .engo-spec-table tr:nth-child(even) td { background: #f5f5f5; }\n  .engo-spec-table td:first-child { font-weight: 600; color: #1a1a1a; width: 42%; }\n\n  .engo-pills { display: flex; flex-wrap: wrap; gap: 0.55rem; margin-bottom: 1.2rem; }\n  .engo-pill { background: #f0f0f0; color: #1a1a1a; border-radius: 20px; padding: 0.35rem 1rem; font-size: 15px !important; font-weight: 500; border: 1px solid #ccc; line-height: 1.4; }\n\n  .engo-faq-item { border-bottom: 1px solid #e0e0e0; padding: 1rem 0; }\n  .engo-faq-item:last-child { border-bottom: none; }\n  .engo-faq-item p { margin: 0.4rem 0 0 !important; }\n\n  .engo-inbox-list { list-style: none !important; padding: 0 !important; margin: 0 0 1rem !important; }\n  .engo-inbox-list li { padding: 0.5rem 0 0.5rem 1.8rem !important; border-bottom: 1px solid #ebebeb; position: relative; margin-bottom: 0 !important; font-size: 16px !important; }\n  .engo-inbox-list li::before { content: \"✓\"; position: absolute; left: 0; color: #2e7d32; font-weight: 700; }\n\n  .engo-infobox { background: #fff8e6; border: 1px solid #f0d080; border-radius: 6px; padding: 1rem 1.2rem; margin-top: 1.5rem; color: #5a4a00; line-height: 1.6; font-size: 16px !important; }\n\n  @media (max-width: 600px) {\n    .engo-why-grid { grid-template-columns: 1fr; }\n    .engo-spec-table td:first-child { width: auto; }\n  }\n\u003c\/style\u003e\n\n\u003cdiv class=\"engo-desc\"\u003e\n\n\u003cdiv class=\"engo-intro-box\"\u003e\n  \u003cp\u003e\u003cstrong\u003eThe ENGO EHW-B is a WiFi-enabled programmable timer and built-in thermostat for domestic hot water (DHW) heaters — in a sleek matt black finish.\u003c\/strong\u003e It lets you schedule exactly when your water heater runs, control it remotely via the ENGO Smart app, and use its built-in thermostat to maintain the target water temperature — saving energy without sacrificing comfort. Compatible with most electric water heaters and immersion cylinders. No hub required.\u003c\/p\u003e\n  \u003cdiv class=\"engo-badges\"\u003e\n    \u003cspan class=\"engo-badge\"\u003eWiFi Built-In\u003c\/span\u003e\n    \u003cspan class=\"engo-badge\"\u003eNo Hub Required\u003c\/span\u003e\n    \u003cspan class=\"engo-badge\"\u003eProgrammable Timer\u003c\/span\u003e\n    \u003cspan class=\"engo-badge\"\u003eBuilt-In Thermostat\u003c\/span\u003e\n    \u003cspan class=\"engo-badge\"\u003eApp Control\u003c\/span\u003e\n    \u003cspan class=\"engo-badge\"\u003eMatt Black Finish\u003c\/span\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eWhy Choose the ENGO EHW-B?\u003c\/h2\u003e\n\u003cdiv class=\"engo-why-grid\"\u003e\n  \u003cdiv class=\"engo-why-card\"\u003e📱 \u003cstrong\u003eENGO Smart App\u003c\/strong\u003e\u003cp\u003eControl, schedule, and monitor your water heater remotely from anywhere in the world — iOS and Android.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"engo-why-card\"\u003e⏱️ \u003cstrong\u003eProgrammable Schedule\u003c\/strong\u003e\u003cp\u003eSet precise times for the heater to run — only heat water when you actually need it, reducing electricity bills.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"engo-why-card\"\u003e🌡️ \u003cstrong\u003eBuilt-In Thermostat\u003c\/strong\u003e\u003cp\u003eMaintains your target water temperature with adjustable hysteresis (±1°C to ±20°C) — no separate thermostat needed.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"engo-why-card\"\u003e📶 \u003cstrong\u003eWiFi — No Hub\u003c\/strong\u003e\u003cp\u003e2.4 GHz WiFi built in — connects directly to your home network. No gateway or bridge device required.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"engo-why-card\"\u003e⚡ \u003cstrong\u003eEnergy Savings\u003c\/strong\u003e\u003cp\u003eAvoid heating water during peak tariff hours — programme to run on off-peak Economy 7 or Octopus Go overnight rates.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"engo-why-card\"\u003e🔌 \u003cstrong\u003eSensor or Dry-Contact Input\u003c\/strong\u003e\u003cp\u003eS1\/COM input accepts an external temperature sensor or a volt-free contact for advanced control scenarios.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"engo-why-card\"\u003e🎨 \u003cstrong\u003eMatt Black Finish\u003c\/strong\u003e\u003cp\u003eContemporary dark finish blends with modern kitchen, utility, and bathroom interiors. White version (EHW-W) also available.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"engo-why-card\"\u003e🖥️ \u003cstrong\u003eIntuitive Control Panel\u003c\/strong\u003e\u003cp\u003eClear display and straightforward programming directly on the device — no app required for basic operation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eSuitable For\u003c\/h2\u003e\n\u003cdiv class=\"engo-pills\"\u003e\n  \u003cspan class=\"engo-pill\"\u003eElectric Water Heaters\u003c\/span\u003e\n  \u003cspan class=\"engo-pill\"\u003eImmersion Heaters\u003c\/span\u003e\n  \u003cspan class=\"engo-pill\"\u003eHot Water Cylinders\u003c\/span\u003e\n  \u003cspan class=\"engo-pill\"\u003eUnvented Cylinders\u003c\/span\u003e\n  \u003cspan class=\"engo-pill\"\u003eEconomy 7 \/ Off-Peak Scheduling\u003c\/span\u003e\n  \u003cspan class=\"engo-pill\"\u003eRental Properties\u003c\/span\u003e\n  \u003cspan class=\"engo-pill\"\u003eHoliday Homes\u003c\/span\u003e\n  \u003cspan class=\"engo-pill\"\u003eApartments\u003c\/span\u003e\n  \u003cspan class=\"engo-pill\"\u003eSmart Home Integration\u003c\/span\u003e\n  \u003cspan class=\"engo-pill\"\u003eRetrofit DHW Control\u003c\/span\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eAbout the EHW-B\u003c\/h2\u003e\n\u003cp\u003eThe EHW-B replaces or supplements a standard hot water timer or immersion heater controller. It mounts on the wall near the water heater and wires to the heater's mains supply via its built-in relay. Its 230V COM\/NO\/NC relay output (rated 5(2)A) switches the heater according to the programmed schedule and thermostat setpoint.\u003c\/p\u003e\n\n\u003cdiv class=\"engo-callout-blue\"\u003e\n  \u003cstrong\u003e💡 Economy 7 \u0026amp; Off-Peak Tariff Optimisation\u003c\/strong\u003e\u003cbr\u003e\n  If you're on an Economy 7, Octopus Go, or other time-of-use electricity tariff, the EHW-B makes it simple to schedule your water heater to run exclusively during cheap-rate hours — typically overnight between 00:30 and 07:30. Set the schedule once in the app and the heater will automatically exploit your cheapest electricity without any manual intervention.\n\u003c\/div\u003e\n\n\u003cp\u003eThe built-in thermostat monitors water temperature using the S1\/COM input, which accepts an NTC temperature sensor (such as a clip-on or immersion probe) or a volt-free contact from an existing thermostat. The hysteresis band is adjustable from ±1°C to ±20°C, giving flexible control suited to everything from precise temperature maintenance to simple bang-bang switching.\u003c\/p\u003e\n\n\u003cdiv class=\"engo-callout\"\u003e\n  \u003cstrong\u003e🔌 Relay Output: 5(2)A — Important Note\u003c\/strong\u003e\u003cbr\u003e\n  The EHW's built-in relay is rated 5(2)A — suitable for directly switching low-power water heaters or signal circuits. For controlling higher-current immersion heaters or boiler loads, the EHW should be wired to a 16A contactor or external relay, with the EHW's output controlling the contactor coil.\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eWiFi 2.4 GHz built in — no hub or gateway required\u003c\/li\u003e\n  \u003cli\u003eENGO Smart app control (iOS \u0026amp; Android, Tuya Cloud)\u003c\/li\u003e\n  \u003cli\u003eProgrammable timer — set operating hours and heating schedule\u003c\/li\u003e\n  \u003cli\u003eBuilt-in thermostat with adjustable hysteresis (±1°C to ±20°C)\u003c\/li\u003e\n  \u003cli\u003eDisplay temperature accuracy: 0.5°C\u003c\/li\u003e\n  \u003cli\u003eRelay output: NO\/COM\/NC, rated 5(2)A at 230V\u003c\/li\u003e\n  \u003cli\u003eS1\/COM input: NTC temperature sensor or volt-free contact\u003c\/li\u003e\n  \u003cli\u003e230V AC 50Hz power supply\u003c\/li\u003e\n  \u003cli\u003eEnergy savings — avoids unnecessary heating\u003c\/li\u003e\n  \u003cli\u003eIntuitive onboard control panel and display\u003c\/li\u003e\n  \u003cli\u003eMatt black finish (see EHW-W for white)\u003c\/li\u003e\n  \u003cli\u003eCompact 90 × 90 × 44 mm housing\u003c\/li\u003e\n  \u003cli\u003eWall mount installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"engo-spec-table\"\u003e\n  \u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eEHW-B\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eColour\u003c\/td\u003e\n\u003ctd\u003eMatt Black\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003ePower Supply\u003c\/td\u003e\n\u003ctd\u003e230V AC \/ 50Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eCommunication\u003c\/td\u003e\n\u003ctd\u003eWi-Fi 2.4 GHz (no hub required)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eApp\u003c\/td\u003e\n\u003ctd\u003eENGO Smart (Tuya Cloud) — iOS \u0026amp; Android\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eRelay Output\u003c\/td\u003e\n\u003ctd\u003eNO\/COM\/NC, 5(2)A at 230V AC\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eSensor\/Input (S1\/COM)\u003c\/td\u003e\n\u003ctd\u003eNTC temperature sensor or volt-free contact\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eControl Algorithm\u003c\/td\u003e\n\u003ctd\u003eHysteresis (±1°C to ±20°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eDisplay Accuracy\u003c\/td\u003e\n\u003ctd\u003e0.5°C\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e90 × 90 × 44 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eWall mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cp\u003eInstallation must be carried out by a qualified person per BS 7671. Ensure the relay output rating is appropriate for the load being switched — use an external contactor for loads exceeding 5A.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eWire 230V L and N to the power supply terminals\u003c\/li\u003e\n  \u003cli\u003eConnect the NO\/COM output to the heater's mains supply (for loads up to 5A direct; use a contactor for larger loads)\u003c\/li\u003e\n  \u003cli\u003eConnect an NTC temperature sensor to S1\/COM for thermostat operation, or a volt-free contact for ON\/OFF override\u003c\/li\u003e\n  \u003cli\u003eWi-Fi setup: 2.4 GHz only — ensure your phone is on 2.4 GHz during app setup\u003c\/li\u003e\n  \u003cli\u003eProgramme schedule and setpoints directly on the device or via the ENGO Smart app\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"engo-faq-item\"\u003e\n    \u003ch3\u003eCan this control a standard immersion heater?\u003c\/h3\u003e\n    \u003cp\u003eYes, but most immersion heaters draw 3kW (approx. 13A) which exceeds the relay's 5A rating. Wire the EHW's relay output to a 16A contactor coil, and let the contactor switch the immersion heater directly. The EHW controls the contactor; the contactor controls the heater.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"engo-faq-item\"\u003e\n    \u003ch3\u003eDo I need an app to use this?\u003c\/h3\u003e\n    \u003cp\u003eNo — the EHW can be programmed and operated directly using the onboard control panel and display. The app adds convenience (remote access, scheduling from anywhere) but is not required for basic operation.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"engo-faq-item\"\u003e\n    \u003ch3\u003eDoes it work with any water heater?\u003c\/h3\u003e\n    \u003cp\u003eIt is compatible with most electric water heaters and immersion cylinder systems that accept on\/off switching control. It is not suitable for gas boiler hot water circuits (which use a different control method) or combi boilers.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"engo-faq-item\"\u003e\n    \u003ch3\u003eIs there a white version?\u003c\/h3\u003e\n    \u003cp\u003eYes — the EHW-W is identical in specification and features but finished in white. See the EHW-W listing.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"engo-faq-item\"\u003e\n    \u003ch3\u003eDoes the built-in thermostat need a separate sensor?\u003c\/h3\u003e\n    \u003cp\u003eYes — the thermostat function requires an external NTC temperature sensor connected to the S1\/COM terminals. Without a sensor, only timer-based on\/off control is available.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1× EHW-B WiFi hot water timer (matt black)\u003c\/li\u003e\n  \u003cli\u003eWall mounting fixings\u003c\/li\u003e\n  \u003cli\u003eQuick installation guide\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote: NTC temperature sensor sold separately. For the white version see EHW-W.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003cp style=\"margin-top:24px; color:#666;\"\u003eInstallation by qualified person per BS 7671. Relay rated 5(2)A — use external contactor for loads exceeding 5A. 2.4 GHz Wi-Fi only. White version available: \u003cstrong\u003eEHW-W\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"ENGO Controls","offers":[{"title":"Default Title","offer_id":63496433828189,"sku":"EHW-B","price":65.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/ENGOEHW-BHotWaterTimerProgrammableImmersionHeaterController-Black.webp?v=1771496100","url":"https:\/\/qualityheating.co.uk\/products\/engo-ehw-b-wifi-hot-water-timer-with-built-in-thermostat-programmable-dhw-controller-black","provider":"AIZO Quality Heating","version":"1.0","type":"link"}