{"product_id":"engo-erel-16zb-zigbee-smart-relay-1-16a-wireless-boiler-pump-lighting-control","title":"ENGO EREL-16ZB ZigBee Smart Relay 1×16A – Wireless Boiler, Pump \u0026 Lighting Control","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 EREL-16ZB is a ZigBee 3.0 smart relay module that provides wireless on\/off control of 230V loads up to 16A — all from the ENGO Smart app, Alexa, or Google Assistant.\u003c\/strong\u003e Housed in a compact flush-box or DIN rail enclosure, it acts as a smart boiler relay, pump switch, lighting controller, or general automation module. It stores programmed rules and continues to operate offline — and accepts an optional EFS300 temperature sensor for advanced temperature-triggered automation.\u003c\/p\u003e\n  \u003cdiv class=\"engo-badges\"\u003e\n    \u003cspan class=\"engo-badge\"\u003eZigBee 3.0\u003c\/span\u003e\n    \u003cspan class=\"engo-badge\"\u003e16A Volt-Free Output\u003c\/span\u003e\n    \u003cspan class=\"engo-badge\"\u003eFlush Box \/ DIN Rail\u003c\/span\u003e\n    \u003cspan class=\"engo-badge\"\u003eWorks Offline\u003c\/span\u003e\n    \u003cspan class=\"engo-badge\"\u003eAlexa \u0026amp; Google\u003c\/span\u003e\n    \u003cspan class=\"engo-badge\"\u003eEFS300 Sensor Input\u003c\/span\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eWhy Choose the ENGO EREL-16ZB?\u003c\/h2\u003e\n\u003cdiv class=\"engo-why-grid\"\u003e\n  \u003cdiv class=\"engo-why-card\"\u003e📡 \u003cstrong\u003eZigBee 3.0\u003c\/strong\u003e\u003cp\u003eStable, low-power wireless mesh — works with EGATE-PRO gateway for cloud control or standalone in offline mode with saved rules.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"engo-why-card\"\u003e⚡ \u003cstrong\u003e16A Load Rating\u003c\/strong\u003e\u003cp\u003eHigh-capacity relay handles boilers, immersion heaters, pumps, lighting circuits, fans, and gate motors.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"engo-why-card\"\u003e🔌 \u003cstrong\u003eVolt-Free COM\/NO Output\u003c\/strong\u003e\u003cp\u003eClean contact output — drives any device requiring a potential-free signal, including boiler thermostat inputs.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"engo-why-card\"\u003e🌐 \u003cstrong\u003eWorks Offline\u003c\/strong\u003e\u003cp\u003eSaved rules and schedules run without internet — rules execute even when broadband is down.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"engo-why-card\"\u003e🌡️ \u003cstrong\u003eEFS300 Sensor Input\u003c\/strong\u003e\u003cp\u003eConnect an optional EFS300 temperature sensor (S1\/S2 terminals) for temperature-triggered rules — ideal for hot water cylinder or pipe frost protection.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"engo-why-card\"\u003e📱 \u003cstrong\u003eApp \u0026amp; Voice Control\u003c\/strong\u003e\u003cp\u003eFull remote control via ENGO Smart app, Amazon Alexa, and Google Assistant — requires EGATE-PRO gateway.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"engo-why-card\"\u003e🔧 \u003cstrong\u003eFlush Box or DIN Rail\u003c\/strong\u003e\u003cp\u003eFits in a standard UK 47 mm flush-mount back box (behind a socket or switch plate) or mounts on DIN rail — flexible installation.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"engo-why-card\"\u003e🔗 \u003cstrong\u003eENGO Binding\u003c\/strong\u003e\u003cp\u003eBinds directly with ENGO ZigBee thermostats for offline thermostat-to-relay control, even without internet.\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\"\u003eBoiler ON\/OFF Control\u003c\/span\u003e\n  \u003cspan class=\"engo-pill\"\u003eCirculation Pump Control\u003c\/span\u003e\n  \u003cspan class=\"engo-pill\"\u003eImmersion Heater Control\u003c\/span\u003e\n  \u003cspan class=\"engo-pill\"\u003eLighting Circuits\u003c\/span\u003e\n  \u003cspan class=\"engo-pill\"\u003eFan Control\u003c\/span\u003e\n  \u003cspan class=\"engo-pill\"\u003eGate \/ Access Motors\u003c\/span\u003e\n  \u003cspan class=\"engo-pill\"\u003eElectric Heaters\u003c\/span\u003e\n  \u003cspan class=\"engo-pill\"\u003eHot Water Cylinder\u003c\/span\u003e\n  \u003cspan class=\"engo-pill\"\u003eUFH Pump Switching\u003c\/span\u003e\n  \u003cspan class=\"engo-pill\"\u003eSmart Home Automation\u003c\/span\u003e\n  \u003cspan class=\"engo-pill\"\u003eRetrofit Smart Control\u003c\/span\u003e\n  \u003cspan class=\"engo-pill\"\u003eECB62-ZB Zone Expansion\u003c\/span\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eAbout the EREL-16ZB\u003c\/h2\u003e\n\u003cp\u003eThe EREL-16ZB is a ZigBee 3.0 relay module that can be hidden inside a standard flush-mount back box (behind a socket or light switch faceplate) or installed on a DIN rail in a consumer unit or manifold cabinet. It requires a ZigBee gateway (EGATE-PRO or EGATEZB) to access cloud features, but it also stores rules locally and operates fully offline — critical for heating applications where reliable operation cannot depend solely on internet connectivity.\u003c\/p\u003e\n\n\u003cdiv class=\"engo-callout-blue\"\u003e\n  \u003cstrong\u003e🌡️ EFS300 Temperature Sensor Integration\u003c\/strong\u003e\u003cbr\u003e\n  The S1\/S2 contacts on the EREL-16ZB accept the optional ENGO EFS300 external temperature sensor. Once connected, the sensor's reading appears in the ENGO Smart app, and you can create rules such as \"switch the relay ON when the sensor temperature drops below 5°C\" — ideal for pipe frost protection, hot water cylinder boost, or controlling equipment based on ambient temperature in a remote location such as a loft, garage, or outbuilding.\n\u003c\/div\u003e\n\n\u003cp\u003eThe ENGO Binding function allows the relay to be directly linked with ENGO ZigBee thermostats (EONE or E25 series) without the gateway acting as the intermediary. This means the relay will respond to the thermostat's heat demand signal even when there is no internet connection and the gateway is offline — a robust fail-safe for heating control applications.\u003c\/p\u003e\n\n\u003cdiv class=\"callout-orange\"\u003e\n  \u003cstrong\u003e⚠️ Gateway Required for App and Voice Control\u003c\/strong\u003e\u003cbr\u003e\n  The EREL-16ZB must be added to an ENGO ZigBee gateway (EGATE-PRO or EGATEZB, sold separately) to enable app control, scheduling via the cloud, and voice assistant commands. Without a gateway, the relay can still operate via ENGO Binding with a compatible thermostat, using its locally stored rules.\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eZigBee 3.0 wireless communication (2.4 GHz)\u003c\/li\u003e\n  \u003cli\u003eVolt-free COM\/NO relay output — 16A maximum load\u003c\/li\u003e\n  \u003cli\u003e230V AC 50Hz power supply\u003c\/li\u003e\n  \u003cli\u003eWorks offline — stores and executes rules without internet\u003c\/li\u003e\n  \u003cli\u003eEFS300 temperature sensor input (S1\/S2 terminals) — −40°C to 120°C range\u003c\/li\u003e\n  \u003cli\u003eENGO Binding — direct offline thermostat-to-relay control\u003c\/li\u003e\n  \u003cli\u003eENGO Smart app control (requires EGATE-PRO or EGATEZB gateway)\u003c\/li\u003e\n  \u003cli\u003eAmazon Alexa and Google Assistant voice control (requires gateway)\u003c\/li\u003e\n  \u003cli\u003eTuya Smart and SmartLife compatible\u003c\/li\u003e\n  \u003cli\u003eSupports bistable switch or monostable pushbutton local control\u003c\/li\u003e\n  \u003cli\u003eFlush-mount back box installation (47 mm depth)\u003c\/li\u003e\n  \u003cli\u003eDIN rail mounting bracket included\u003c\/li\u003e\n  \u003cli\u003eLED status indicator\u003c\/li\u003e\n  \u003cli\u003eFactory reset via 8-second button hold\u003c\/li\u003e\n  \u003cli\u003eCompliant: 2014\/30\/EU, 2014\/35\/EU, 2014\/53\/EU, 2011\/65\/EU\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\u003eEREL-16ZB\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eCommunication\u003c\/td\u003e\n\u003ctd\u003eZigBee 3.0, 2.4 GHz\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\u003eMax Load\u003c\/td\u003e\n\u003ctd\u003e16A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eOutput\u003c\/td\u003e\n\u003ctd\u003eVolt-free COM\/NO relay\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eSensor Input (S1\/S2)\u003c\/td\u003e\n\u003ctd\u003eEFS300 temperature sensor or volt-free contact\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eSensor Temp. Range\u003c\/td\u003e\n\u003ctd\u003e−40°C to 120°C (with EFS300)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eOffline Operation\u003c\/td\u003e\n\u003ctd\u003eYes — stored rules execute without internet\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eFlush box (47 mm) or DIN rail (bracket included)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eApp\u003c\/td\u003e\n\u003ctd\u003eENGO Smart (Tuya Cloud), Tuya Smart, SmartLife\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eVoice Control\u003c\/td\u003e\n\u003ctd\u003eAmazon Alexa, Google Assistant (requires gateway)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eGateway Required\u003c\/td\u003e\n\u003ctd\u003eYes — EGATE-PRO or EGATEZB (sold separately)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e5 years\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. The relay operates at 230V and must be correctly fused within the circuit.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConnect L and N (230V supply) and the COM\/NO output to the controlled device's input\u003c\/li\u003e\n  \u003cli\u003eConnect optional EFS300 sensor to S1\/S2 terminals; activate temperature sensor mode in the app settings\u003c\/li\u003e\n  \u003cli\u003eRed LED flashing quickly on power-up: relay is in pairing mode — add to gateway via ENGO Smart app\u003c\/li\u003e\n  \u003cli\u003eHold button for 8 seconds to reset (red LED flashes): relay returns to pairing mode\u003c\/li\u003e\n  \u003cli\u003eFor ENGO Binding with a thermostat: both devices must be on the same ZigBee network; press the relay button 5 times quickly to enter binding mode\u003c\/li\u003e\n  \u003cli\u003eWhen bound to a thermostat, the relay will switch off after 50 minutes if communication is lost — fail-safe behaviour\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\u003eDo I need the gateway for this to work?\u003c\/h3\u003e\n    \u003cp\u003eYou need the gateway for app control, remote access, cloud scheduling, and voice commands. However, if you use ENGO Binding with a compatible thermostat, the relay will operate offline without the gateway, executing locally stored rules.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"engo-faq-item\"\u003e\n    \u003ch3\u003eCan I use this to control my boiler?\u003c\/h3\u003e\n    \u003cp\u003eYes — the volt-free COM\/NO output is compatible with the thermostat input on any standard UK boiler. Wire the output to the boiler's T\/T or thermostat terminals.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"engo-faq-item\"\u003e\n    \u003ch3\u003eCan I use this with a temperature sensor?\u003c\/h3\u003e\n    \u003cp\u003eYes — connect an ENGO EFS300 sensor to the S1\/S2 terminals and activate it in the app settings. The sensor reading becomes available for creating temperature-based automation rules.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"engo-faq-item\"\u003e\n    \u003ch3\u003eWill it fit behind a standard UK socket?\u003c\/h3\u003e\n    \u003cp\u003eYes — the compact dimensions allow installation inside a 47 mm deep flush back box, hidden behind a standard UK socket or switch faceplate.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"engo-faq-item\"\u003e\n    \u003ch3\u003eIs it compatible with third-party ZigBee devices?\u003c\/h3\u003e\n    \u003cp\u003eThe EREL-16ZB is designed for use within the ENGO Smart \/ Tuya ecosystem. It may be compatible with other Tuya-based ZigBee 3.0 gateways, but full functionality is only guaranteed with ENGO gateways.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1× EREL-16ZB ZigBee smart relay module\u003c\/li\u003e\n  \u003cli\u003eDIN rail mounting bracket\u003c\/li\u003e\n  \u003cli\u003eQuick installation guide\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote: EGATE-PRO or EGATEZB gateway sold separately. EFS300 temperature sensor sold separately.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003cp style=\"margin-top:24px; color:#666;\"\u003eRequires ENGO ZigBee gateway for app and voice control. Installation by qualified person per BS 7671. Max load 16A. Temperature sensor (EFS300) sold separately.\u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"ENGO Controls","offers":[{"title":"Default Title","offer_id":63496355709277,"sku":"EREL-16ZB","price":29.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/ENGOEREL-16ZBZigBeeSmartRelay.webp?v=1771495909","url":"https:\/\/qualityheating.co.uk\/products\/engo-erel-16zb-zigbee-smart-relay-1-16a-wireless-boiler-pump-lighting-control","provider":"AIZO Quality Heating","version":"1.0","type":"link"}