{"product_id":"honeywell-home-dt4-black-wired-room-thermostat-dt40bt22-on-off-digital-heating-control","title":"Honeywell Home DT4 Black Wired Room Thermostat | DT40BT22 On\/Off Digital Heating Control","description":"\u003cdiv class=\"product-description\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eHoneywell Home DT4 Black Wired Room Thermostat DT40BT22\u003c\/strong\u003e is a modern digital thermostat providing precise room temperature control for heating systems in homes and apartments. Featuring a large clear LED segment display with energy-efficient auto-off technology and simple wake-up button operation, it combines slim design with reliable performance.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnergy-efficient LED display\u003c\/strong\u003e automatically turns off when not in use to save battery life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBacklit captive touch buttons\u003c\/strong\u003e for intuitive operation day or night.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in eco-mode\u003c\/strong\u003e reduces room temperature for set periods to save energy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuzzy Logic control\u003c\/strong\u003e optimises boiler on\/off cycles for precise temperature maintenance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible with hybrid and green systems\u003c\/strong\u003e including heat pumps, zoning, and underfloor heating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow battery warning\u003c\/strong\u003e and simple AA battery replacement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy Choose Honeywell Home DT4 Black?\u003c\/h2\u003e\n\u003cp\u003eModern slim design with proven Honeywell reliability, this thermostat offers straightforward operation for all users while providing advanced energy-saving features and broad system compatibility.\u003c\/p\u003e\n\u003cp\u003eErP Class IV (+2%) rating ensures compliance with current efficiency standards for heating controls.\u003c\/p\u003e\n\u003ch2\u003eSuitable For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGas boilers, combi boilers, and heat pumps\u003c\/strong\u003e (24-230 V on\/off control).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-port zone valve applications\u003c\/strong\u003e in multi-zone heating systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNew installations and replacements\u003c\/strong\u003e in domestic environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: \u003cstrong\u003eHoneywell Home by Resideo\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eModel: \u003cstrong\u003eDT4 Black Wired Room Thermostat\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMPN: \u003cstrong\u003eDT40BT22\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eGTIN: \u003cstrong\u003e5059085002633\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eControl Type: \u003cstrong\u003eOn\/Off (24-230 V)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003ePower Supply: \u003cstrong\u003e2 x AA batteries (included)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eBattery Life: \u003cstrong\u003eApprox. 3.5 years\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eSet Point Range: \u003cstrong\u003e5 °C to 35 °C\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDisplay Range: \u003cstrong\u003e0 °C to 40 °C\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eSensor: \u003cstrong\u003e10k NTC thermistor @ 25 °C\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eSwitching Capacity: \u003cstrong\u003e3 A resistive, 1 A inductive\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eSwitch Type: \u003cstrong\u003eSPDT\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eErP Class: \u003cstrong\u003eClass IV (+2 %)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDimensions: \u003cstrong\u003e101 x 101 x 23 mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWeight: \u003cstrong\u003e0.17 kg\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWiring: \u003cstrong\u003eUp to 2.5 mm² terminals\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eOperating Temperature: \u003cstrong\u003e0 °C to 40 °C\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWarranty: \u003cstrong\u003e2 years\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation \u0026amp; Operation\u003c\/h2\u003e\n\u003cp\u003eSimple wall-mounted wired installation with flip-up wiring platform. User menu allows heating\/cooling selection, eco offset duration, and frost protection (minimum 5 °C). Installer menu provides cycle rate adjustment, setpoint limits, and factory reset functions.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":62799297806685,"sku":"DT40BT22","price":37.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/dt40bt22-honeywell-dt4-black-wired.jpg?v=1764922186","url":"https:\/\/qualityheating.co.uk\/products\/honeywell-home-dt4-black-wired-room-thermostat-dt40bt22-on-off-digital-heating-control","provider":"AIZO Quality Heating","version":"1.0","type":"link"}