{"product_id":"honeywell-home-bdr91a-wireless-relay-box-bdr91a1000-evohome-compatible-rf-boiler-receiver","title":"Honeywell Home BDR91A Wireless Relay Box | BDR91A1000 | evohome Compatible RF Boiler Receiver","description":"\u003cstyle\u003e\n.qh-pd, .qh-pd *::before, .qh-pd *::after { box-sizing: border-box; margin: 0; padding: 0; }\n.qh-pd { font-family: inherit; font-size: 16px; line-height: 1.65; color: #1a1a2e; }\n.qh-pd .badge-row { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 1.2rem; }\n.qh-pd .badge { display: inline-block; font-size: 11px; font-weight: 700; border-radius: 4px; padding: 3px 9px; letter-spacing: 0.04em; text-transform: uppercase; }\n.qh-pd .b-red { background: #c0392b; color: #fff; }\n.qh-pd .b-navy { background: #1a1a2e; color: #fff; }\n.qh-pd .b-green { background: #1b7a40; color: #fff; }\n.qh-pd .b-blue { background: #1565c0; color: #fff; }\n.qh-pd .b-grey { background: #555;    color: #fff; }\n.qh-pd .b-orange { background: #e8720c; color: #fff; }\n.qh-pd .prod-desc { font-size: 15.5px; color: #2a2a2a; margin-bottom: 1.4rem; line-height: 1.75; }\n.qh-pd .feat-list { list-style: none; margin-bottom: 1.4rem; }\n.qh-pd .feat-list li { padding: 4px 0 4px 20px; position: relative; font-size: 15px; }\n.qh-pd .feat-list li::before { content: \"✓\"; position: absolute; left: 0; color: #c0392b; font-weight: 700; }\n.qh-pd .two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin-bottom: 1.5rem; }\n@media (max-width: 620px) {\n.qh-pd .two-col { grid-template-columns: 1fr; }\n}\n.qh-pd .section-label { font-size: 11px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: #888; margin-bottom: 0.6rem; margin-top: 1.6rem; }\n.qh-pd .spec-table { width: 100%; border-collapse: collapse; margin-bottom: 1.5rem; font-size: 14px; }\n.qh-pd .spec-table td { padding: 8px 12px; border-bottom: 1px solid #eee; vertical-align: top; }\n.qh-pd .spec-table tr:nth-child(even) td { background: #faf8f4; }\n.qh-pd .spec-table tr:nth-child(odd)  td { background: #fff; }\n.qh-pd .spec-table td:first-child { font-weight: 600; color: #333; width: 40%; }\n.qh-pd .compat-table { width: 100%; border-collapse: collapse; margin-bottom: 1.5rem; font-size: 14px; box-shadow: 0 1px 4px rgba(0,0,0,0.08); border-radius: 8px; overflow: hidden; }\n.qh-pd .compat-table thead tr { background: #1a1a2e; color: #fff; }\n.qh-pd .compat-table th { padding: 10px 14px; text-align: left; font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; font-weight: 700; }\n.qh-pd .compat-table td { padding: 9px 14px; border-bottom: 1px solid #eee; font-size: 14px; vertical-align: top; }\n.qh-pd .compat-table tr:last-child td { border-bottom: none; }\n.qh-pd .compat-table tr:nth-child(even) td { background: #faf8f4; }\n.qh-pd .compat-table tr:nth-child(odd)  td { background: #fff; }\n.qh-pd .tick { color: #1b7a40; font-size: 16px; font-weight: 700; }\n.qh-pd .cross { color: #b71c1c; font-size: 16px; font-weight: 700; }\n.qh-pd .callout { padding: 0.8rem 1.1rem; border-radius: 0 6px 6px 0; margin: 0.8rem 0; font-size: 14.5px; }\n.qh-pd .callout-orange { background: #fff3e0; border-left: 4px solid #e8720c; color: #4a2500; }\n.qh-pd .callout-blue { background: #e8f4fd; border-left: 4px solid #1565c0; color: #0a2a50; }\n.qh-pd .callout-green { background: #e8f5e9; border-left: 4px solid #1b7a40; color: #0a2a18; }\n.qh-pd .sku-block { background: #1a1a2e; color: #fff; border-radius: 8px; padding: 1rem 1.2rem; margin-bottom: 1.5rem; font-size: 14px; display: flex; flex-wrap: wrap; gap: 1.5rem; }\n.qh-pd .sku-block .sku-item strong { display: block; font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: #aaa; margin-bottom: 3px; }\n.qh-pd .sku-block .sku-item span { font-family: 'Courier New', monospace; font-size: 15px; color: #f9a825; font-weight: 700; }\n.qh-pd .faq-item { border-bottom: 1px solid #e8e8e8; padding: 0.75rem 0; }\n.qh-pd .faq-item:last-child { border-bottom: none; }\n.qh-pd .faq-q { font-weight: 700; font-size: 15px; color: #1a1a2e; margin-bottom: 0.3rem; }\n.qh-pd .faq-a { font-size: 14.5px; color: #444; }\n\u003c\/style\u003e\n\n\u003cdiv class=\"qh-pd\"\u003e\n\u003c!-- Badges --\u003e\n  \u003cdiv class=\"badge-row\"\u003e\n    \u003cspan class=\"badge b-red\"\u003eHoneywell Home\u003c\/span\u003e\n    \u003cspan class=\"badge b-navy\"\u003eWireless RF 868 MHz\u003c\/span\u003e\n    \u003cspan class=\"badge b-green\"\u003eevohome Compatible\u003c\/span\u003e\n    \u003cspan class=\"badge b-blue\"\u003e5A Switching\u003c\/span\u003e\n    \u003cspan class=\"badge b-orange\"\u003e230V or Volt-Free\u003c\/span\u003e\n    \u003cspan class=\"badge b-grey\"\u003eRamses II Protocol\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- SKU block --\u003e\n  \u003cdiv class=\"sku-block\"\u003e\n    \u003cdiv class=\"sku-item\"\u003e\n      \u003cstrong\u003eMPN\u003c\/strong\u003e\n      \u003cspan\u003eBDR91A1000\u003c\/span\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"sku-item\"\u003e\n      \u003cstrong\u003eModel Name\u003c\/strong\u003e\n      \u003cspan\u003eBDR91A\u003c\/span\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"sku-item\"\u003e\n      \u003cstrong\u003eEAN\u003c\/strong\u003e\n      \u003cspan\u003e5025121385114\u003c\/span\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"sku-item\"\u003e\n      \u003cstrong\u003eMax Switching Current\u003c\/strong\u003e\n      \u003cspan\u003e5A\u003c\/span\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"sku-item\"\u003e\n      \u003cstrong\u003eSupply Voltage\u003c\/strong\u003e\n      \u003cspan\u003e230V AC mains (permanent)\u003c\/span\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Description --\u003e\n  \u003cp class=\"prod-desc\"\u003e\n    The Honeywell Home BDR91A is a mains-powered wireless relay module that acts as the switching interface between a Honeywell Home RF heating controller and a boiler, pump, motorised valve, electric towel rail, or other heating appliance. It receives demand signals over the 868 MHz Ramses II RF protocol and switches the connected load on and off accordingly, replacing the need for a direct wired link between thermostat and appliance. The BDR91A is compatible with the full range of Honeywell Home 868 MHz wireless controls including evohome, DT4R, DT92E, CM927, CM921, and the Sundial RF² range, making it the correct receiver to specify when evohome integration or compatibility with home automation and heating control systems is required. It supports both 230V switching and volt-free (potential-free) switching up to 5A, covering the majority of residential and light commercial heating applications. A binding procedure is required on installation to pair the BDR91A with the controlling device.\n  \u003c\/p\u003e\n\n  \u003c!-- Features --\u003e\n  \u003cdiv class=\"section-label\"\u003eKey Features\u003c\/div\u003e\n  \u003cul class=\"feat-list\"\u003e\n    \u003cli\u003eevohome compatible — the correct receiver to use when connecting to the Honeywell Home evohome system or home automation platforms\u003c\/li\u003e\n    \u003cli\u003e868 MHz Ramses II RF protocol — compatible with the full range of Honeywell Home wireless heating controls\u003c\/li\u003e\n    \u003cli\u003e230V switched output or volt-free (potential-free) switching — suits boilers, pumps, motorised valves, electric towel rails and more\u003c\/li\u003e\n    \u003cli\u003e5A maximum switching current — covers the vast majority of residential heating components\u003c\/li\u003e\n    \u003cli\u003ePermanent 230V mains supply — no batteries required; always on and ready to receive RF commands\u003c\/li\u003e\n    \u003cli\u003eLED status indication — green LED confirms relay state; red LED indicates RF communication loss\u003c\/li\u003e\n    \u003cli\u003eFailsafe mode — if RF communication is lost, relay operates in a configurable failsafe state\u003c\/li\u003e\n    \u003cli\u003eBinding procedure — pairs the relay to the specific controller during commissioning; one-to-one relationship\u003c\/li\u003e\n    \u003cli\u003eInstall at least 30cm from metal objects — including wall boxes and boiler housing, for best RF performance\u003c\/li\u003e\n    \u003cli\u003eCompatible with DT4R, DT92E, CM927, CM921, evohome, Sundial RF² and other Honeywell Home 868 MHz products\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003cdiv class=\"callout callout-green\"\u003e\n    ✓ \u003cstrong\u003eRequired for evohome and home automation integration:\u003c\/strong\u003e The BDR91A is the relay module needed when the switching function must be managed by the Honeywell Home evohome controller or integrated into a broader home automation or heating control system. It is also the correct replacement for the DT4R pack receiver in any installation requiring evohome compatibility.\n  \u003c\/div\u003e\n\n  \u003c!-- Compatibility --\u003e\n  \u003cdiv class=\"section-label\"\u003eCompatible Honeywell Home Controllers\u003c\/div\u003e\n  \u003ctable class=\"compat-table\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eController \/ System\u003c\/th\u003e\n        \u003cth\u003eCompatible?\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHoneywell Home evohome\u003c\/td\u003e\n        \u003ctd class=\"tick\"\u003e✓\u003c\/td\u003e\n        \u003ctd\u003ePrimary use case — evohome controller manages boiler demand via BDR91A\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eDT4R wireless room thermostat (YT42WRFT20 \/ YT42GRFT21 \/ YT42BRFT22)\u003c\/td\u003e\n        \u003ctd class=\"tick\"\u003e✓\u003c\/td\u003e\n        \u003ctd\u003eReplaces the basic relay included in the DT4R pack for evohome-compatible installations\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eDT92E \/ DT92E1000\u003c\/td\u003e\n        \u003ctd class=\"tick\"\u003e✓\u003c\/td\u003e\n        \u003ctd\u003eStandard pairing for the DT92E wireless thermostat range\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCM927 \/ CM921 wireless programmable thermostat\u003c\/td\u003e\n        \u003ctd class=\"tick\"\u003e✓\u003c\/td\u003e\n        \u003ctd\u003eFully compatible; standard pairing for CM927 \/ CM921 installations\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSundial RF² range\u003c\/td\u003e\n        \u003ctd class=\"tick\"\u003e✓\u003c\/td\u003e\n        \u003ctd\u003eCompatible with the complete Sundial RF² product family\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHCW80 \/ T87RF wireless controls\u003c\/td\u003e\n        \u003ctd class=\"tick\"\u003e✓\u003c\/td\u003e\n        \u003ctd\u003eConfirmed compatible with Honeywell Home 868 MHz Ramses II devices\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHeat pump (on\/off demand)\u003c\/td\u003e\n        \u003ctd class=\"cross\"\u003e✗\u003c\/td\u003e\n        \u003ctd\u003eThe BDR91A is not suitable for heat pump applications — specify the BDR91T1004 (post-2021, with house symbol) for heat pump installations\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNon-Honeywell \/ different RF frequency controllers\u003c\/td\u003e\n        \u003ctd class=\"cross\"\u003e✗\u003c\/td\u003e\n        \u003ctd\u003eThe BDR91A will only communicate with Honeywell Home 868 MHz Ramses II devices\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003c!-- Specs --\u003e\n  \u003cdiv class=\"section-label\"\u003eTechnical Specifications\u003c\/div\u003e\n  \u003cdiv class=\"two-col\"\u003e\n    \u003ctable class=\"spec-table\"\u003e\n      \u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eResideo (Honeywell Home)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eBDR91A\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMPN\u003c\/td\u003e\n\u003ctd\u003eBDR91A1000\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eEAN\u003c\/td\u003e\n\u003ctd\u003e5025121385114\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eRadio Frequency\u003c\/td\u003e\n\u003ctd\u003e868 MHz ISM band\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eRF Protocol\u003c\/td\u003e\n\u003ctd\u003eRamses II\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/table\u003e\n    \u003ctable class=\"spec-table\"\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMains Supply\u003c\/td\u003e\n\u003ctd\u003e230V AC 50–60Hz (permanent)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMax Switching Current\u003c\/td\u003e\n\u003ctd\u003e5A\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSwitching Type\u003c\/td\u003e\n\u003ctd\u003e230V switched or volt-free (potential-free)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eWire Cross-Section\u003c\/td\u003e\n\u003ctd\u003e1.5–2.5mm²\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eLED Indicators\u003c\/td\u003e\n\u003ctd\u003eGreen (relay active) · Red (RF communication lost)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFailsafe\u003c\/td\u003e\n\u003ctd\u003eConfigurable via installer mode\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Callouts --\u003e\n  \u003cdiv class=\"callout callout-blue\"\u003e\n    ℹ️ \u003cstrong\u003eBinding required:\u003c\/strong\u003e The BDR91A must be bound (paired) to the controlling device before use. If replacing an existing unit or adding to an existing system, reset stored binding data first and follow the binding procedure in the installation guide. The BDR91A can only communicate with the single device it is bound to.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"callout callout-orange\"\u003e\n    ⚠️ \u003cstrong\u003eNot suitable for heat pumps:\u003c\/strong\u003e The BDR91A does not support heat pump applications. For heat pump installations using Honeywell Home RF controls, the BDR91T1004 (post-2021 version, identifiable by the house symbol on the front cover) is required instead.\n  \u003c\/div\u003e\n\n  \u003c!-- FAQ --\u003e\n  \u003cdiv class=\"section-label\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003cdiv class=\"faq-q\"\u003eWhat is the difference between the BDR91A and the receiver included with the DT4R pack?\u003c\/div\u003e\n    \u003cdiv class=\"faq-a\"\u003eThe relay receiver supplied with the DT4R wireless thermostat pack (YT42WRFT20 etc.) is a basic relay for standalone boiler switching only and is not compatible with the evohome system or other home automation and heating control platforms. The BDR91A is the correct receiver to specify when evohome integration is needed, or when the relay must be managed by a central heating controller rather than the thermostat alone.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003cdiv class=\"faq-q\"\u003eCan I use one BDR91A with multiple thermostats or controllers?\u003c\/div\u003e\n    \u003cdiv class=\"faq-a\"\u003eNo. The BDR91A operates on a one-to-one basis — it can only be bound to a single controlling device at a time. For multi-zone installations, a separate BDR91A is required for each zone or appliance being switched.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003cdiv class=\"faq-q\"\u003eDoes the BDR91A work with the DT4R thermostat?\u003c\/div\u003e\n    \u003cdiv class=\"faq-a\"\u003eYes. The DT4R thermostat is compatible with the BDR91A via the Ramses II RF protocol. This combination is the correct pairing for any DT4R installation that also needs evohome compatibility or integration with a home automation system.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003cdiv class=\"faq-q\"\u003eDoes it need batteries?\u003c\/div\u003e\n    \u003cdiv class=\"faq-a\"\u003eNo. The BDR91A requires a permanent 230V AC mains supply. It must be wired into the mains at installation — it cannot operate on battery power.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003cdiv class=\"faq-q\"\u003eWhat does the red LED indicate?\u003c\/div\u003e\n    \u003cdiv class=\"faq-a\"\u003eA red LED indicates that RF communication with the bound controller has been lost. In this state, the relay enters failsafe mode as configured during installation. If the red LED appears during normal operation, check for obstructions between the BDR91A and the controller, and ensure the unit is not mounted on or near metal objects.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003cdiv class=\"faq-q\"\u003eCan it switch volt-free (potential-free) contacts?\u003c\/div\u003e\n    \u003cdiv class=\"faq-a\"\u003eYes. In addition to 230V switching, the BDR91A supports volt-free (potential-free) switching, making it suitable for applications where only a clean contact closure is required rather than a mains-switched output — for example, certain boiler demand inputs and zone valve actuators.\u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":63620418634077,"sku":"BDR91A","price":57.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/BDR91A1000-Honeywell-Home-Wireless-Receiver-Relay-Module-5A.jpg?v=1772034709","url":"https:\/\/qualityheating.co.uk\/products\/honeywell-home-bdr91a-wireless-relay-box-bdr91a1000-evohome-compatible-rf-boiler-receiver","provider":"AIZO Quality Heating","version":"1.0","type":"link"}