{"product_id":"engo-ehw-w-wifi-hot-water-timer-with-built-in-thermostat-programmable-dhw-controller-white","title":"ENGO EHW-W WiFi Hot Water Timer with Built-In Thermostat – Programmable DHW Controller | White","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-W is a WiFi-enabled programmable hot water timer and thermostat in a clean white finish — designed to put your domestic water heater on a smart schedule.\u003c\/strong\u003e Control it remotely via the ENGO Smart app, programme it to run only during off-peak electricity hours, and rely on the built-in thermostat to maintain your preferred water temperature. Compatible with most electric water heaters and immersion cylinders. No hub needed.\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\"\u003eWhite Finish\u003c\/span\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eWhy Choose the ENGO EHW-W?\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\u003eFull remote control, scheduling, and monitoring from anywhere via iOS or Android — no hub needed.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"engo-why-card\"\u003e⏱️ \u003cstrong\u003eProgrammable Schedule\u003c\/strong\u003e\u003cp\u003eSet exactly when the heater runs — avoids wasted energy heating water at times it's not needed.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"engo-why-card\"\u003e🌡️ \u003cstrong\u003eBuilt-In Thermostat\u003c\/strong\u003e\u003cp\u003eMonitors and maintains water temperature via an external NTC sensor — no separate thermostat device 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 Wi-Fi built into the unit — connects directly to your home network without a gateway.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"engo-why-card\"\u003e⚡ \u003cstrong\u003eOff-Peak Scheduling\u003c\/strong\u003e\u003cp\u003eProgramme to run exclusively on Economy 7, Octopus Go, or other cheap-rate overnight electricity tariffs.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"engo-why-card\"\u003e🔌 \u003cstrong\u003eSensor \/ Dry-Contact Input\u003c\/strong\u003e\u003cp\u003eS1\/COM terminal accepts an NTC temperature sensor or volt-free contact for versatile control options.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"engo-why-card\"\u003e🎨 \u003cstrong\u003eWhite Finish\u003c\/strong\u003e\u003cp\u003eClean white finish matches standard UK switches and sockets — blends seamlessly into any room. Black version (EHW-B) also available.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"engo-why-card\"\u003e🖥️ \u003cstrong\u003eOnboard Controls\u003c\/strong\u003e\u003cp\u003eProgramme and operate directly from the display and buttons — no app required for day-to-day use.\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-W\u003c\/h2\u003e\n\u003cp\u003eThe EHW-W is the white version of the EHW series — identical in specification and function to the EHW-B, differing only in finish. It mounts on the wall near the water heater and switches the heater's mains supply through its built-in relay according to the set schedule and thermostat temperature.\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  On Economy 7, Octopus Go, or similar time-of-use tariffs, hot water can cost significantly more to heat during peak daytime hours than overnight. The EHW-W makes it simple to programme the heater to run only during cheap-rate periods — once set up in the app, it runs automatically every day without any manual adjustment.\n\u003c\/div\u003e\n\n\u003cp\u003eThe built-in thermostat uses an external NTC temperature sensor (connected to S1\/COM) to monitor the water or cylinder temperature and switch the heater according to the hysteresis setpoint. The hysteresis band is adjustable between ±1°C and ±20°C — tighter bands maintain temperature more precisely; wider bands allow greater fluctuation for less frequent switching.\u003c\/p\u003e\n\n\u003cdiv class=\"callout-orange\"\u003e\n  \u003cstrong\u003e⚠️ Relay Output: 5(2)A — Note for High-Current Loads\u003c\/strong\u003e\u003cbr\u003e\n  The built-in relay is rated 5(2)A. For most standard immersion heaters (3 kW \/ ~13A), wire the EHW's output to a suitable 16A contactor, with the EHW controlling the contactor coil. The EHW controls the contactor; the contactor switches the heater.\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eWi-Fi 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 — adjustable operating hours\u003c\/li\u003e\n  \u003cli\u003eBuilt-in thermostat with adjustable hysteresis (±1°C to ±20°C)\u003c\/li\u003e\n  \u003cli\u003eDisplay 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\u003eIntuitive control panel and clear display\u003c\/li\u003e\n  \u003cli\u003eWhite finish (see EHW-B for black)\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-W\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eColour\u003c\/td\u003e\n\u003ctd\u003eWhite\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 connected load.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConnect 230V L and N to the power supply terminals\u003c\/li\u003e\n  \u003cli\u003eWire NO\/COM output to the heater supply (use external contactor for loads over 5A)\u003c\/li\u003e\n  \u003cli\u003eConnect NTC sensor to S1\/COM for thermostat function\u003c\/li\u003e\n  \u003cli\u003eWi-Fi: 2.4 GHz only — ensure your phone is on the 2.4 GHz band during initial app setup\u003c\/li\u003e\n  \u003cli\u003eSchedule and setpoints can be configured on the device display 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 ~13A which exceeds the relay's 5A rating. Wire the EHW's output to a 16A contactor coil, and let the contactor switch the immersion heater. 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\u003eIs a separate thermostat needed?\u003c\/h3\u003e\n    \u003cp\u003eNo — the EHW-W has a built-in thermostat. However, it requires an external NTC temperature sensor connected to S1\/COM to use the thermostat function. Without the sensor, only timed on\/off control is available.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"engo-faq-item\"\u003e\n    \u003ch3\u003eDo I need the ENGO Smart app?\u003c\/h3\u003e\n    \u003cp\u003eNo — the EHW-W can be programmed fully using the onboard display and buttons. The app provides the added convenience of remote access and monitoring.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"engo-faq-item\"\u003e\n    \u003ch3\u003eIs there a black version?\u003c\/h3\u003e\n    \u003cp\u003eYes — the EHW-B is identical in specification but finished in matt black. See the EHW-B listing.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"engo-faq-item\"\u003e\n    \u003ch3\u003eDoes it work with smart tariffs like Octopus Go?\u003c\/h3\u003e\n    \u003cp\u003eYes — programme the timer schedule to match your cheap-rate electricity window and the EHW-W will automatically run the heater only during those hours.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1× EHW-W WiFi hot water timer (white)\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 black version see EHW-B.\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. Black version available: \u003cstrong\u003eEHW-B\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"ENGO Controls","offers":[{"title":"Default Title","offer_id":63496521318749,"sku":"EHW-W","price":65.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/ENGOEHW-WHotWaterTimerProgrammableImmersionHeaterController-White.webp?v=1771496217","url":"https:\/\/qualityheating.co.uk\/products\/engo-ehw-w-wifi-hot-water-timer-with-built-in-thermostat-programmable-dhw-controller-white","provider":"AIZO Quality Heating","version":"1.0","type":"link"}