{"product_id":"honeywell-home-dt4r-white-room-thermostat-spare-dts42wrfst20-wireless","title":"Honeywell Home DT4R White Room Thermostat Spare | DTS42WRFST20 Wireless","description":"\u003cdiv class=\"product-description\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eHoneywell Home DT4R White Room Thermostat  Spare DTS42WRFST20\u003c\/strong\u003e is a spare wireless thermostat head for replacing failed DT4R units or expanding existing Honeywell RF systems. Slim modern design with energy-efficient LED display and full compatibility across evohome, HCC100, and legacy RF products via Ramses II\/III protocol.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpare thermostat only\u003c\/strong\u003e - pairs with existing DT4R, evohome, or HCC100 receivers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRamses II \u0026amp; III RF compatibility\u003c\/strong\u003e works with all Honeywell wireless heating controls.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in eco-mode\u003c\/strong\u003e timed temperature reduction for energy savings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuto-off LED display\u003c\/strong\u003e with wake-up button conserves battery life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBacklit touch buttons\u003c\/strong\u003e ensure easy operation day or night.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuzzy Logic control\u003c\/strong\u003e provides precise temperature regulation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy Choose DT4R White Spare Thermostat?\u003c\/h2\u003e\n\u003cp\u003eEconomical replacement maintains full system performance without buying complete thermostat kits.\u003c\/p\u003e\n\u003cp\u003eClassic white finish matches traditional interiors while delivering modern energy-saving features.\u003c\/p\u003e\n\u003ch2\u003eSuitable For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDT4R replacements\u003c\/strong\u003e (thermostat head failure scenarios).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEvohome\/HCC100 expansions\u003c\/strong\u003e adding wireless thermostats.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eService stock\u003c\/strong\u003e for Honeywell RF heating installations.\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\u003eDT4R White Spare Thermostat Head\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMPN: \u003cstrong\u003eDTS42WRFST20\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eGTIN: \u003cstrong\u003e5059085002671\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003ePower Supply: \u003cstrong\u003e2 x AA batteries\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\u003eRF Frequency: \u003cstrong\u003eISM 868.0-868.6 MHz (Ramses II\/III)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eRange: \u003cstrong\u003e30 m residential\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eErP Class: \u003cstrong\u003eClass V (+3 %)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDimensions: \u003cstrong\u003e101 x 101 x 54 mm (WxHxD)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWeight: \u003cstrong\u003e0.25 kg\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\u003eCompatibility \u0026amp; Installation\u003c\/h2\u003e\n\u003cp\u003eInstant replacement for DT4R white thermostats or spare for evohome underfloor controllers. Simple battery fit and automatic receiver binding. Supports heat pumps, zoning, underfloor heating, zone valves, and 24-230V on\/off appliances.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":62799454437725,"sku":"DTS42WRFST20","price":53.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/HoneywellHomeDT4WhiteWiredRoomThermostat.jpg?v=1764922298","url":"https:\/\/qualityheating.co.uk\/products\/honeywell-home-dt4r-white-room-thermostat-spare-dts42wrfst20-wireless","provider":"AIZO Quality Heating","version":"1.0","type":"link"}