{"product_id":"honeywell-home-dt4r-grey-room-thermostat-spare-thermostat-only","title":"Honeywell Home DT4R Grey Room Thermostat (Spare Thermostat Only)","description":"\u003cdiv style=\"font-family: Arial, sans-serif; color: #1e293b; line-height: 1.7;\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eHoneywell Home DT4R Grey Wireless Room Thermostat Spare (DTS42GRFST21)\u003c\/strong\u003e provides convenient room temperature control for compatible domestic heating systems in homes and apartments. Featuring a slim, modern grey design, a large LED segment display and easy-to-use backlit touch buttons, it combines a contemporary appearance with straightforward temperature adjustment.\u003c\/p\u003e\n\u003cp\u003eThis DT4R model is supplied as a \u003cstrong\u003espare wireless thermostat head only\u003c\/strong\u003e and does not include a wireless receiver. It is designed for use with compatible Honeywell Home heating control systems, including evohome and the HCC100 Underfloor Multi-Zone Controller. Its Ramses II and Ramses III RF protocol supports compatibility with suitable existing Honeywell Home wireless products.\u003c\/p\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0;\"\u003e\n\u003cspan style=\"background: #f1f5f9; padding: 7px 12px; border-radius: 20px; font-size: 13px;\"\u003eHoneywell Home\u003c\/span\u003e \u003cspan style=\"background: #f1f5f9; padding: 7px 12px; border-radius: 20px; font-size: 13px;\"\u003eDT4R Range\u003c\/span\u003e \u003cspan style=\"background: #f1f5f9; padding: 7px 12px; border-radius: 20px; font-size: 13px;\"\u003eWireless RF\u003c\/span\u003e \u003cspan style=\"background: #f1f5f9; padding: 7px 12px; border-radius: 20px; font-size: 13px;\"\u003eGrey Finish\u003c\/span\u003e \u003cspan style=\"background: #f1f5f9; padding: 7px 12px; border-radius: 20px; font-size: 13px;\"\u003eSpare Thermostat Only\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #fff7ed; border-left: 4px solid #d97706; padding: 14px 16px; margin: 20px 0;\"\u003e\n\u003cstrong style=\"color: #9a3412;\"\u003eImportant – No Receiver Included\u003c\/strong\u003e\n\u003cp style=\"margin: 6px 0 0;\"\u003eThis listing is for the DT4R grey thermostat head only. A compatible Honeywell Home wireless receiver or control system is required and must be purchased separately if not already installed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"color: #1e3a5f;\"\u003eKey Features \u0026amp; Benefits\u003c\/h3\u003e\n\u003ch4 style=\"color: #334155;\"\u003e1. Grey DT4R Spare Wireless Thermostat\u003c\/h4\u003e\n\u003cp\u003eA replacement thermostat head for compatible Honeywell Home wireless heating systems, suitable for replacing an existing unit or extending an appropriate installation.\u003c\/p\u003e\n\u003ch4 style=\"color: #334155;\"\u003e2. Ramses II and Ramses III RF Compatibility\u003c\/h4\u003e\n\u003cp\u003eUses Honeywell Home's Ramses II and Ramses III RF protocols, providing backwards and forwards compatibility with suitable compatible wireless products.\u003c\/p\u003e\n\u003ch4 style=\"color: #334155;\"\u003e3. Clear, Energy-Efficient LED Display\u003c\/h4\u003e\n\u003cp\u003eThe large LED-based segment display makes temperature information easy to read and automatically turns off when not in use to help conserve energy.\u003c\/p\u003e\n\u003ch4 style=\"color: #334155;\"\u003e4. Backlit Touch Controls\u003c\/h4\u003e\n\u003cp\u003eBacklit, captive touch buttons provide convenient temperature adjustment and straightforward everyday operation.\u003c\/p\u003e\n\u003ch4 style=\"color: #334155;\"\u003e5. Built-In Eco Mode\u003c\/h4\u003e\n\u003cp\u003eThe built-in Eco mode reduces room temperature for a selected period, helping manage heating use and reduce energy consumption.\u003c\/p\u003e\n\u003ch4 style=\"color: #334155;\"\u003e6. Supports Modern Heating Applications\u003c\/h4\u003e\n\u003cp\u003eDesigned for compatible heating systems, including conventional and combi boilers, heat pumps, zoning, underfloor heating and cooling devices, and zone valve applications.\u003c\/p\u003e\n\u003ch3 style=\"color: #1e3a5f;\"\u003eCompatibility and Applications\u003c\/h3\u003e\n\u003cp\u003eThe Honeywell Home DT4R Grey Spare Thermostat is designed to integrate with suitable existing Honeywell Home wireless heating controls.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCompatible Honeywell Home evohome systems.\u003c\/li\u003e\n\u003cli\u003eHCC100 Underfloor Multi-Zone Controller.\u003c\/li\u003e\n\u003cli\u003eCompatible Honeywell Home RF products using Ramses II\/III protocols.\u003c\/li\u003e\n\u003cli\u003eSuitable conventional and combi boiler applications.\u003c\/li\u003e\n\u003cli\u003eCompatible heat pump installations.\u003c\/li\u003e\n\u003cli\u003eHeating zoning and zone valve applications.\u003c\/li\u003e\n\u003cli\u003eCompatible underfloor heating and cooling devices.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e This thermostat is not suitable for direct control of 240V electric heating circuits. Check the compatibility of your existing receiver and heating appliance before purchasing.\u003c\/p\u003e\n\u003ch3 style=\"color: #1e3a5f;\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 14px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background: #f1f5f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003eHoneywell Home by Resideo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003e\u003cstrong\u003eProduct Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003eDT4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f1f5f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003eDT4R Grey Spare Thermostat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003e\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003eDTS42GRFST21\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f1f5f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003e46414\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003e\u003cstrong\u003eEAN \/ GTIN\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003e5059085002688\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f1f5f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003eSpare Wireless Room Thermostat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003e\u003cstrong\u003eColour\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003eGrey\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f1f5f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003e\u003cstrong\u003eControl Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003eWireless RF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003e\u003cstrong\u003eRF Protocol\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003eRamses II and Ramses III\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f1f5f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003e\u003cstrong\u003eDisplay\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003eLED Segment Display\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003e\u003cstrong\u003eEco Mode\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003eYes – timed temperature reduction\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f1f5f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003e\u003cstrong\u003eCompatible Systems\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003eCompatible evohome and HCC100 systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003e\u003cstrong\u003eReceiver Included\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003eNo – thermostat head only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f1f5f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e2e8f0;\"\u003e2 years, subject to manufacturer's terms and conditions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"color: #1e3a5f;\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4 style=\"color: #334155;\"\u003eDoes the Honeywell Home DT4R Grey thermostat include a wireless receiver?\u003c\/h4\u003e\n\u003cp\u003eNo. The DTS42GRFST21 is a spare thermostat head only. A compatible wireless receiver is not included and must already be available in the heating system.\u003c\/p\u003e\n\u003ch4 style=\"color: #334155;\"\u003eCan this thermostat work with an existing heating system?\u003c\/h4\u003e\n\u003cp\u003eYes, it is designed to work with compatible existing Honeywell Home wireless systems, including suitable evohome and HCC100 configurations. Check the receiver protocol and model before ordering.\u003c\/p\u003e\n\u003ch4 style=\"color: #334155;\"\u003eWhat is the difference between wireless RF and Wi-Fi heating controls?\u003c\/h4\u003e\n\u003cp\u003eWireless RF controls communicate with compatible heating receivers using a dedicated radio-frequency protocol. Wi-Fi controls use a wireless network for connected features. The supplied DT4R information specifies Ramses II\/III RF communication and does not specify built-in Wi-Fi connectivity.\u003c\/p\u003e\n\u003ch4 style=\"color: #334155;\"\u003eDoes installing this thermostat require a professional?\u003c\/h4\u003e\n\u003cp\u003eInstallation and pairing should follow the manufacturer's instructions. If receiver wiring, boiler connections or changes to the heating system are required, use a suitably qualified heating controls professional.\u003c\/p\u003e\n\u003ch4 style=\"color: #334155;\"\u003eCan this thermostat control 240V electric heating?\u003c\/h4\u003e\n\u003cp\u003eNo. The supplied product information states that it is not suitable for direct control of 240V electric heating circuits.\u003c\/p\u003e\n\u003cdiv style=\"background: #f1f5f9; border-radius: 8px; padding: 18px; margin-top: 24px;\"\u003e\n\u003ch3 style=\"color: #1e3a5f; margin-top: 0;\"\u003eOrder Honeywell Home DT4R Grey Spare Thermostat from GetPlumb\u003c\/h3\u003e\n\u003cp\u003eChoose the \u003cstrong\u003eHoneywell Home DT4R Grey Wireless Room Thermostat Spare DTS42GRFST21\u003c\/strong\u003e for a compatible existing wireless heating control system. Its modern grey finish, LED display and convenient touch controls make it a practical replacement thermostat for suitable installations.\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0;\"\u003e\u003cstrong style=\"color: #d97706;\"\u003eOrder Now from GetPlumb\u003c\/strong\u003e for your heating control requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":53898823827792,"sku":"DTS42GRFST21","price":66.31,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0858\/5268\/4624\/files\/honeywell-home-dt4r-grey-room-thermostat-spare-thermostat-only-1908348.jpg?v=1793435287","url":"https:\/\/getplumb.co.uk\/fr\/products\/honeywell-home-dt4r-grey-room-thermostat-spare-thermostat-only","provider":"Getplumb","version":"1.0","type":"link"}