{"product_id":"honeywell-home-du144-22mm-automatic-bypass-valve-straight-pattern-du144a1001","title":"Honeywell Home DU144 22mm Automatic Bypass Valve | Straight Pattern DU144A1001","description":"\u003cdiv class=\"product-description\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eHoneywell Home DU144A1001 22mm Automatic Bypass Valve\u003c\/strong\u003e maintains minimum flow through boilers when TRVs close, preventing low flow alarms and flue gas condensation corrosion. Factory-set to 0.2 bar with adjustable range 0.1-0.6 bar, it ensures proper operation of boiler temperature sensors and external compensating controls.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e22mm compression fittings\u003c\/strong\u003e for straight pipe installation between flow and return.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable differential pressure\u003c\/strong\u003e 0.1-0.6 bar (factory 0.2 bar) via knurled handwheel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtection cap\u003c\/strong\u003e prevents unauthorised adjustment of settings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh flow capacity\u003c\/strong\u003e kvs 2.3 (cv 2.7) up to 1.5 m³\/hour.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrass construction\u003c\/strong\u003e with stainless steel spindle and EPDM seals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpanner flats\u003c\/strong\u003e assist compression fitting tightening.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy Choose Honeywell DU144?\u003c\/h2\u003e\n\u003cp\u003eEssential safety device for modern condensing boilers requiring minimum flow protection, reducing system noise and ensuring reliable operation when most radiators are closed.\u003c\/p\u003e\n\u003cp\u003eSuperior to fixed bypass valves with precise pressure control and rugged industrial design.\u003c\/p\u003e\n\u003ch2\u003eSuitable For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondensing boilers\u003c\/strong\u003e specifying minimum flow requirements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystems with TRVs\u003c\/strong\u003e where return temperature protection is needed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGas water heaters\u003c\/strong\u003e requiring guaranteed minimum circulation.\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\u003eDU144 Straight Automatic Bypass Valve\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMPN: \u003cstrong\u003eDU144A1001\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eConnections: \u003cstrong\u003e22mm compression (straight pattern)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMedium: \u003cstrong\u003eWater\/glycol mix (VDI 2035 compliant)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003epH Range: \u003cstrong\u003e8-9.5\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eOperating Temperature: \u003cstrong\u003e2-130 °C\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMaximum Pressure: \u003cstrong\u003e10 bar\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDifferential Pressure: \u003cstrong\u003e0.1-0.6 bar (factory 0.2 bar)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eFlow Capacity: \u003cstrong\u003ekvs 2.3 (cv 2.7)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMaterials: \u003cstrong\u003eBrass body, stainless spindle, EPDM seals\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDimensions: \u003cstrong\u003e79 x 80 x 60 mm (WxHxD)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWeight: \u003cstrong\u003e0.3 kg\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWarranty: \u003cstrong\u003e1 year\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation \u0026amp; Operation\u003c\/h2\u003e\n\u003cp\u003eInstall between boiler flow and return with arrow indicating flow direction. Adjust handwheel to required differential pressure (typically 0.15-0.3 bar per boiler manual). Valve modulates automatically - closes when TRVs open (normal flow), opens progressively when TRVs close (restricting main circuit flow).\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":62799441035613,"sku":"DU144A1001","price":45.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/du144a1001HoneywellHome22mmAutomaticBy-passValveStraightDU144.jpg?v=1764921806","url":"https:\/\/qualityheating.co.uk\/products\/honeywell-home-du144-22mm-automatic-bypass-valve-straight-pattern-du144a1001","provider":"AIZO Quality Heating","version":"1.0","type":"link"}