{"product_id":"vaillant-ecotech-840-combi-boiler-with-horizontal-flue-15mm-scale-reducer","title":"Vaillant Ecotech 840 Combi Boiler with Horizontal Flue \u0026 15mm Scale Reducer","description":"\u003cdiv class=\"qMYqUG_convSearchResultHighlightRoot\"\u003e\n\u003cdiv data-is-intersecting=\"true\" data-turn-id-container=\"request-6a5c8076-6870-83eb-ada8-d94fc8646e45-8\" class=\"\"\u003e\n\u003csection data-turn=\"assistant\" data-testid=\"conversation-turn-40\" data-turn-id-container=\"request-6a5c8076-6870-83eb-ada8-d94fc8646e45-8\" data-turn-id=\"request-6a5c8076-6870-83eb-ada8-d94fc8646e45-8\" dir=\"auto\" class=\"text-token-text-primary w-full focus:outline-none has-data-writing-block:pointer-events-none [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-15 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\" data-conversation-screenshot-content=\"\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" data-message-model-slug=\"gpt-5-5\" dir=\"auto\" data-turn-start-message=\"true\" data-message-id=\"a9c7a690-d042-4af0-af6e-4b056c9ac28d\" data-message-author-role=\"assistant\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert wrap-break-word w-full light markdown-new-styling\"\u003e\n\u003cp data-start=\"41\" data-end=\"502\" class=\"PDq2pG_selectionAnchorContainer\"\u003eThe \u003cstrong data-start=\"45\" data-end=\"86\"\u003eVaillant ecoTEC Plus 840 Combi Boiler\u003c\/strong\u003e is a premium \u003cstrong data-start=\"100\" data-end=\"127\"\u003e40kW combination boiler\u003c\/strong\u003e designed to provide powerful central heating and exceptional mains-pressure hot water for larger homes with high demand. As a combi boiler, it delivers both heating and instant hot water without requiring a separate hot water cylinder or cold water storage tank, helping to save valuable space while maintaining outstanding performance. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cspan aria-hidden=\"true\" class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"504\" data-end=\"903\"\u003eFeaturing Vaillant's latest condensing technology, intuitive semi-touch controls, and intelligent combustion management, the ecoTEC Plus 840 is engineered for maximum efficiency, simplified installation, and long-term reliability. It is fully compatible with Vaillant smart controls and renewable heating technologies, making it a future-ready heating solution. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"905\" data-end=\"908\"\u003e\n\u003ch2 data-section-id=\"1ma7m6t\" data-start=\"910\" data-end=\"925\"\u003eKey Features\u003c\/h2\u003e\n\u003cul data-start=\"927\" data-end=\"1755\"\u003e\n\u003cli data-section-id=\"1ikyrqg\" data-start=\"927\" data-end=\"964\"\u003e40kW Combination (Combi) Gas Boiler\u003c\/li\u003e\n\u003cli data-section-id=\"bdylec\" data-start=\"965\" data-end=\"989\"\u003eFuel Type: Natural Gas\u003c\/li\u003e\n\u003cli data-section-id=\"1ml6vqd\" data-start=\"990\" data-end=\"1024\"\u003eInstant mains-pressure hot water\u003c\/li\u003e\n\u003cli data-section-id=\"vhixok\" data-start=\"1025\" data-end=\"1057\"\u003eNo hot water cylinder required\u003c\/li\u003e\n\u003cli data-section-id=\"1qgfd7q\" data-start=\"1058\" data-end=\"1097\"\u003eErP A Rated for heating and hot water\u003c\/li\u003e\n\u003cli data-section-id=\"1hz6ld0\" data-start=\"1098\" data-end=\"1137\"\u003eHigh-efficiency condensing technology\u003c\/li\u003e\n\u003cli data-section-id=\"oxavxj\" data-start=\"1138\" data-end=\"1175\"\u003eIntuitive semi-touch user interface\u003c\/li\u003e\n\u003cli data-section-id=\"7hhe0m\" data-start=\"1176\" data-end=\"1222\"\u003eIoniDETECT intelligent combustion technology\u003c\/li\u003e\n\u003cli data-section-id=\"wzsry7\" data-start=\"1223\" data-end=\"1256\"\u003eUp to \u003cstrong data-start=\"1231\" data-end=\"1256\"\u003e1:10 modulation ratio\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1w1urww\" data-start=\"1257\" data-end=\"1311\"\u003eDomestic hot water flow rate: \u003cstrong data-start=\"1289\" data-end=\"1311\"\u003e19.0 L\/min (Δ30°C)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"n0rypl\" data-start=\"1312\" data-end=\"1366\"\u003eDomestic hot water flow rate: \u003cstrong data-start=\"1344\" data-end=\"1366\"\u003e16.3 L\/min (Δ35°C)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"coxjha\" data-start=\"1367\" data-end=\"1401\"\u003eHydrogen Blend Ready (up to 20%)\u003c\/li\u003e\n\u003cli data-section-id=\"1kpe9tk\" data-start=\"1402\" data-end=\"1448\"\u003eSmart home ready with \u003cstrong data-start=\"1426\" data-end=\"1448\"\u003emyVAILLANT connect\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"lweyme\" data-start=\"1449\" data-end=\"1527\"\u003eCompatible with Vaillant heating controls, flues, and renewable technologies\u003c\/li\u003e\n\u003cli data-section-id=\"ncbmfu\" data-start=\"1528\" data-end=\"1560\"\u003eStainless steel heat exchanger\u003c\/li\u003e\n\u003cli data-section-id=\"6v3n\" data-start=\"1561\" data-end=\"1606\"\u003eStandard \u003cstrong data-start=\"1572\" data-end=\"1606\"\u003e5-year manufacturer's warranty\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1kikvvq\" data-start=\"1607\" data-end=\"1755\"\u003eExtendable to \u003cstrong data-start=\"1623\" data-end=\"1635\"\u003e10 years\u003c\/strong\u003e when installed by a Vaillant Advance Installer (subject to terms and conditions). \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1757\" data-end=\"1760\"\u003e\n\u003ch2 data-section-id=\"1xyg8rs\" data-start=\"1762\" data-end=\"1787\"\u003eIdeal for Larger Homes\u003c\/h2\u003e\n\u003cp data-start=\"1789\" data-end=\"2033\"\u003eThe ecoTEC Plus 840 is designed for \u003cstrong data-start=\"1825\" data-end=\"1841\"\u003elarger homes\u003c\/strong\u003e with one or more bathrooms and high domestic hot water demand. Its powerful output ensures reliable heating while supplying multiple hot water outlets with excellent pressure and consistency.\u003c\/p\u003e\n\u003cp data-start=\"2035\" data-end=\"2205\"\u003eAs a combi boiler, it removes the need for a separate hot water cylinder, making it an ideal space-saving solution for modern homes. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"2207\" data-end=\"2210\"\u003e\n\u003ch2 data-section-id=\"i47kqn\" data-start=\"2212\" data-end=\"2267\"\u003ePowerful Heating \u0026amp; Exceptional Hot Water Performance\u003c\/h2\u003e\n\u003cp data-start=\"2269\" data-end=\"2474\"\u003eDelivering \u003cstrong data-start=\"2280\" data-end=\"2306\"\u003e40kW of heating output\u003c\/strong\u003e and an impressive \u003cstrong data-start=\"2325\" data-end=\"2388\"\u003e19.0 litres per minute domestic hot water flow rate (Δ30°C)\u003c\/strong\u003e, the ecoTEC Plus 840 is built for homes where comfort and performance are a priority.\u003c\/p\u003e\n\u003cp data-start=\"2476\" data-end=\"2798\"\u003eVaillant's \u003cstrong data-start=\"2487\" data-end=\"2501\"\u003eIoniDETECT\u003c\/strong\u003e technology continuously monitors combustion conditions and automatically adjusts burner performance for optimum efficiency. Combined with a \u003cstrong data-start=\"2642\" data-end=\"2667\"\u003e1:10 modulation ratio\u003c\/strong\u003e, it reduces fuel consumption while maintaining consistent heating and hot water performance. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"2800\" data-end=\"2803\"\u003e\n\u003ch2 data-section-id=\"13vq7gk\" data-start=\"2805\" data-end=\"2842\"\u003eCompact Design \u0026amp; Easy Installation\u003c\/h2\u003e\n\u003cp data-start=\"2844\" data-end=\"2936\"\u003eDespite its high output, the ecoTEC Plus 840 maintains a compact, installer-friendly design.\u003c\/p\u003e\n\u003ch3 data-section-id=\"bpec4l\" data-start=\"2938\" data-end=\"2952\"\u003eDimensions\u003c\/h3\u003e\n\u003cul data-start=\"2954\" data-end=\"3011\"\u003e\n\u003cli data-section-id=\"1qr0c0o\" data-start=\"2954\" data-end=\"2973\"\u003e\n\u003cstrong data-start=\"2956\" data-end=\"2967\"\u003eHeight:\u003c\/strong\u003e 720mm\u003c\/li\u003e\n\u003cli data-section-id=\"1feugck\" data-start=\"2974\" data-end=\"2992\"\u003e\n\u003cstrong data-start=\"2976\" data-end=\"2986\"\u003eWidth:\u003c\/strong\u003e 440mm\u003c\/li\u003e\n\u003cli data-section-id=\"p25rfm\" data-start=\"2993\" data-end=\"3011\"\u003e\n\u003cstrong data-start=\"2995\" data-end=\"3005\"\u003eDepth:\u003c\/strong\u003e 386mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3013\" data-end=\"3206\"\u003eThe familiar installation footprint and redesigned internal layout provide easy access to major components, helping reduce installation and servicing time. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"3208\" data-end=\"3211\"\u003e\n\u003ch2 data-section-id=\"ex875a\" data-start=\"3213\" data-end=\"3242\"\u003eAdvanced Energy Efficiency\u003c\/h2\u003e\n\u003cp data-start=\"3244\" data-end=\"3419\"\u003eThe ecoTEC Plus 840 combines advanced condensing technology with intelligent combustion monitoring to maximise seasonal efficiency while helping reduce household energy costs.\u003c\/p\u003e\n\u003cp data-start=\"3421\" data-end=\"3627\"\u003eThe boiler is also \u003cstrong data-start=\"3440\" data-end=\"3464\"\u003eHydrogen Blend Ready\u003c\/strong\u003e, allowing operation with gas supplies containing up to \u003cstrong data-start=\"3520\" data-end=\"3536\"\u003e20% hydrogen\u003c\/strong\u003e, helping prepare your heating system for the future. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"3629\" data-end=\"3632\"\u003e\n\u003ch2 data-section-id=\"bvzj9p\" data-start=\"3634\" data-end=\"3672\"\u003eSmart Heating Control Compatibility\u003c\/h2\u003e\n\u003cp data-start=\"3674\" data-end=\"3852\"\u003eCompatible with \u003cstrong data-start=\"3690\" data-end=\"3712\"\u003emyVAILLANT connect\u003c\/strong\u003e and Vaillant's latest smart heating controls, the ecoTEC Plus 840 enables homeowners to monitor and adjust heating remotely via smartphone.\u003c\/p\u003e\n\u003cp data-start=\"3854\" data-end=\"4033\"\u003eIts intelligent modulation and weather compensation capabilities help maximise comfort while improving energy efficiency throughout the year. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"4035\" data-end=\"4038\"\u003e\n\u003ch2 data-section-id=\"19rweb4\" data-start=\"4040\" data-end=\"4082\"\u003eReliable Performance \u0026amp; Easy Maintenance\u003c\/h2\u003e\n\u003cp data-start=\"4084\" data-end=\"4275\"\u003eBuilt with a durable \u003cstrong data-start=\"4105\" data-end=\"4139\"\u003estainless steel heat exchanger\u003c\/strong\u003e and Vaillant's intelligent \u003cstrong data-start=\"4167\" data-end=\"4177\"\u003elinBUS\u003c\/strong\u003e communication technology, the ecoTEC Plus 840 is engineered for dependable long-term performance.\u003c\/p\u003e\n\u003cp data-start=\"4277\" data-end=\"4480\"\u003eThe intuitive commissioning wizard and improved service accessibility make installation, maintenance, and servicing faster and more convenient for heating engineers. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"4482\" data-end=\"4485\"\u003e\n\u003ch2 data-section-id=\"15okmn6\" data-start=\"4487\" data-end=\"4514\"\u003eWarranty \u0026amp; Peace of Mind\u003c\/h2\u003e\n\u003cp data-start=\"4516\" data-end=\"4814\"\u003eThe Vaillant ecoTEC Plus 840 comes with a \u003cstrong data-start=\"4558\" data-end=\"4592\"\u003e5-year manufacturer's warranty\u003c\/strong\u003e as standard. When installed and registered by a \u003cstrong data-start=\"4641\" data-end=\"4671\"\u003eVaillant Advance Installer\u003c\/strong\u003e, the warranty can be extended to \u003cstrong data-start=\"4705\" data-end=\"4717\"\u003e10 years\u003c\/strong\u003e, providing additional long-term protection and confidence. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"4816\" data-end=\"4819\"\u003e\n\u003ch2 data-section-id=\"1nxf9pc\" data-start=\"4821\" data-end=\"4864\"\u003eWhy Choose the Vaillant ecoTEC Plus 840?\u003c\/h2\u003e\n\u003cul data-start=\"4866\" data-end=\"5251\"\u003e\n\u003cli data-section-id=\"kdm78l\" data-start=\"4866\" data-end=\"4894\"\u003ePowerful 40kW combi boiler\u003c\/li\u003e\n\u003cli data-section-id=\"1ml6vqd\" data-start=\"4895\" data-end=\"4929\"\u003eInstant mains-pressure hot water\u003c\/li\u003e\n\u003cli data-section-id=\"ja1h27\" data-start=\"4930\" data-end=\"4972\"\u003eUp to \u003cstrong data-start=\"4938\" data-end=\"4952\"\u003e19.0 L\/min\u003c\/strong\u003e hot water flow rate\u003c\/li\u003e\n\u003cli data-section-id=\"7hhe0m\" data-start=\"4973\" data-end=\"5019\"\u003eIoniDETECT intelligent combustion technology\u003c\/li\u003e\n\u003cli data-section-id=\"wzsry7\" data-start=\"5020\" data-end=\"5053\"\u003eUp to \u003cstrong data-start=\"5028\" data-end=\"5053\"\u003e1:10 modulation ratio\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1fr75s0\" data-start=\"5054\" data-end=\"5082\"\u003eHydrogen Blend Ready (20%)\u003c\/li\u003e\n\u003cli data-section-id=\"dss3bs\" data-start=\"5083\" data-end=\"5106\"\u003eSmart home compatible\u003c\/li\u003e\n\u003cli data-section-id=\"ncbmfu\" data-start=\"5107\" data-end=\"5139\"\u003eStainless steel heat exchanger\u003c\/li\u003e\n\u003cli data-section-id=\"1bt3ywd\" data-start=\"5140\" data-end=\"5176\"\u003eCompact, installer-friendly design\u003c\/li\u003e\n\u003cli data-section-id=\"82it51\" data-start=\"5177\" data-end=\"5251\"\u003eUp to 10-year warranty available\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Mağazam","offers":[{"title":"Default Title","offer_id":49033229566107,"sku":null,"price":1740.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0773\/2091\/3051\/files\/vaillant-ecotec-plus-2023-1_1.webp?v=1784462117","url":"https:\/\/boilerlines.co.uk\/products\/vaillant-ecotech-840-combi-boiler-with-horizontal-flue-15mm-scale-reducer","provider":"Boiler Lines","version":"1.0","type":"link"}