{"product_id":"air-source-heat-pump-antifreeze-valve-automatic","title":"KIVO AFV001 Heat Pump Antifreeze Valve — 28 mm","description":"\u003cdiv style=\"color:#233746;font-size:16px;line-height:1.7;\"\u003e\n\u003cdiv style=\"background:#f4f6f5;border-left:4px solid #1a636e;padding:16px 20px;margin:0 0 24px;\"\u003e\n\u003ch3 style=\"margin:0 0 8px;font-size:19px;color:#0e2130;\"\u003eConnection size \u0026amp; installation fit\u003c\/h3\u003e\n\u003cp style=\"margin:0;\"\u003eThis listing is for the 28 mm model. Other connection sizes or types require a separate enquiry and are not included with this item.\u003c\/p\u003e\n\u003cp style=\"margin:8px 0 0;font-size:14px;\"\u003ePipe connection size is not the overall product size. For a dimensioned drawing or tight-space installation, email \u003ca href=\"mailto:sales@rockensupplygroup.co.uk\"\u003esales@rockensupplygroup.co.uk\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"font-size:20px;line-height:1.35;color:#0e2130;margin:28px 0 12px;\"\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eAntifreeze Valve\u003c\/strong\u003e is designed to provide automatic frost protection for \u003cstrong\u003eair source heat pump (ASHP) systems and outdoor heating circuits\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eWhen the water temperature falls to approximately \u003cstrong\u003e3°C\u003c\/strong\u003e, the valve automatically opens to discharge water from the system, helping to reduce the risk of freezing and potential damage to heat pumps, pipework and associated components. Once the temperature rises to approximately \u003cstrong\u003e4°C\u003c\/strong\u003e, the valve automatically closes.\u003c\/p\u003e\n\u003cp\u003eManufactured from high-quality \u003cstrong\u003eCW617N brass\u003c\/strong\u003e, the valve offers durable and reliable performance in demanding outdoor heating applications. Its fully mechanical operation requires \u003cstrong\u003eno external power supply\u003c\/strong\u003e, providing dependable freeze protection even during a power failure.\u003c\/p\u003e\n\u003cp\u003eThis listing is the \u003cstrong\u003e28 mm model\u003c\/strong\u003e. Contact KIVO to enquire about other sizes or connection types.\u003c\/p\u003e\n\u003ch3 style=\"font-size:20px;line-height:1.35;color:#0e2130;margin:28px 0 12px;\"\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eAutomatic freeze protection for air source heat pump systems\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eOpens automatically at approximately 3°C\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAutomatically closes when temperature rises to approximately 4°C\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eNo electricity or external power supply required\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eHelps protect heat pumps, pipework and outdoor heating circuits from frost damage\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufactured from durable CW617N brass\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSuitable for exposed outdoor heating installations\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eCompact design for straightforward installation\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e28 mm connection size for this listing\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eConfirm connection compatibility before installation\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"font-size:20px;line-height:1.35;color:#0e2130;margin:28px 0 12px;\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv\u003e\u003cdiv\u003e\u003ctable style=\"width:100%;border-collapse:collapse;font-size:15px;line-height:1.5;\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"background:#0e2130;color:#fff;text-align:left;padding:12px;border:1px solid #dce4e7;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"background:#0e2130;color:#fff;text-align:left;padding:12px;border:1px solid #dce4e7;\"\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:11px 12px;border:1px solid #dce4e7;vertical-align:top;\"\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:11px 12px;border:1px solid #dce4e7;vertical-align:top;\"\u003eCW617N Brass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:11px 12px;border:1px solid #dce4e7;vertical-align:top;\"\u003e\u003cstrong\u003eMaximum Working Pressure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:11px 12px;border:1px solid #dce4e7;vertical-align:top;\"\u003e10 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:11px 12px;border:1px solid #dce4e7;vertical-align:top;\"\u003e\u003cstrong\u003eWorking Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:11px 12px;border:1px solid #dce4e7;vertical-align:top;\"\u003e0°C to 90°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:11px 12px;border:1px solid #dce4e7;vertical-align:top;\"\u003e\u003cstrong\u003eAmbient Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:11px 12px;border:1px solid #dce4e7;vertical-align:top;\"\u003e-30°C to +60°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:11px 12px;border:1px solid #dce4e7;vertical-align:top;\"\u003e\u003cstrong\u003eOpening Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:11px 12px;border:1px solid #dce4e7;vertical-align:top;\"\u003e3°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:11px 12px;border:1px solid #dce4e7;vertical-align:top;\"\u003e\u003cstrong\u003eClosing Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:11px 12px;border:1px solid #dce4e7;vertical-align:top;\"\u003e4°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:11px 12px;border:1px solid #dce4e7;vertical-align:top;\"\u003e\u003cstrong\u003eTemperature Accuracy\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:11px 12px;border:1px solid #dce4e7;vertical-align:top;\"\u003e±1°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:11px 12px;border:1px solid #dce4e7;vertical-align:top;\"\u003e\u003cstrong\u003eConnection Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:11px 12px;border:1px solid #dce4e7;vertical-align:top;\"\u003eConfirm the supplied fitting type before installation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:11px 12px;border:1px solid #dce4e7;vertical-align:top;\"\u003e\u003cstrong\u003eAvailable Sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:11px 12px;border:1px solid #dce4e7;vertical-align:top;\"\u003e28 mm (this listing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:11px 12px;border:1px solid #dce4e7;vertical-align:top;\"\u003e\u003cstrong\u003ePower Supply\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:11px 12px;border:1px solid #dce4e7;vertical-align:top;\"\u003eNot Required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:11px 12px;border:1px solid #dce4e7;vertical-align:top;\"\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:11px 12px;border:1px solid #dce4e7;vertical-align:top;\"\u003eAir Source Heat Pumps \/ Outdoor Heating Systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003ch3 style=\"font-size:20px;line-height:1.35;color:#0e2130;margin:28px 0 12px;\"\u003eApplications\u003c\/h3\u003e\n\u003cp\u003eIdeal for use with:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAir source heat pump systems\u003c\/li\u003e\n\u003cli\u003eOutdoor heating pipework\u003c\/li\u003e\n\u003cli\u003eASHP flow and return circuits\u003c\/li\u003e\n\u003cli\u003eDomestic heating installations\u003c\/li\u003e\n\u003cli\u003eCommercial heat pump systems\u003c\/li\u003e\n\u003cli\u003eExposed heating pipework requiring frost protection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"font-size:20px;line-height:1.35;color:#0e2130;margin:28px 0 12px;\"\u003eWhy Use an Antifreeze Valve?\u003c\/h3\u003e\n\u003cp\u003eAir source heat pump systems often include pipework and components installed outdoors. During freezing conditions, stagnant water within exposed sections of the system can freeze and potentially damage pipework, valves or heat pump components.\u003c\/p\u003e\n\u003cp\u003eThe antifreeze valve provides a \u003cstrong\u003esimple mechanical safeguard\u003c\/strong\u003e, automatically responding to low water temperatures without relying on electricity, sensors or electronic controls.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"KIVO","offers":[{"title":"Default Title","offer_id":58656861815165,"sku":"X0001.028.0000-0000","price":48.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0957\/1405\/0429\/files\/ChatGPT_Image_Jul_29_2026_04_28_56_PM.png?v=1788962332","url":"https:\/\/www.rockensupplygroup.co.uk\/products\/air-source-heat-pump-antifreeze-valve-automatic","provider":"Rocken Supply Group Store","version":"1.0","type":"link"}