{"product_id":"intatec-zero1sw-heat-pump-anti-freeze-valve-1-male-1-female-swivel","title":"Intatec ZERO1SW Heat Pump Anti-Freeze Valve – 1\" Male × 1\" Female Swivel","description":"\u003cdiv style=\"font-family: Arial, sans-serif; color: #1a1a1a; max-width: 900px; line-height: 1.7;\"\u003e\n\u003c!-- Header bar --\u003e\n\u003cdiv style=\"background: #008377CF; color: #fff; padding: 14px 20px; border-radius: 4px; margin-bottom: 24px;\"\u003e\n\u003cp style=\"margin: 4px 0 0; font-size: 11px; opacity: 0.7;\"\u003e1\" Male × 1\" Female Swivel — Water-Sensing Thermostatic Anti-Freeze Valve — Part L Compliant\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Intro --\u003e\n\u003cp style=\"font-size: 15px;\"\u003eThe \u003cstrong\u003eIntatec ZERO1SW\u003c\/strong\u003e is a patented water-sensing thermostatic anti-freeze valve engineered to protect air source heat pump systems from freeze damage. Unlike ambient air-sensing valves, the Zero's wax thermostatic element sits directly in the water flow — it reacts to the actual system water temperature, not the surrounding air temperature. This means it operates correctly when fully insulated, in compliance with Building Regulations Part L, which requires all external heat pump pipework and fittings to be fully insulated and sealed.\u003c\/p\u003e\n\u003cp style=\"font-size: 15px;\"\u003eThe valve discharges when the water temperature drops to 3°C and closes again at 4°C, draining just enough water to prevent ice formation without unnecessary water loss. Sold individually; Inta recommend fitting one valve on both the flow and return pipework.\u003c\/p\u003e\n\u003c!-- Badge strip --\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0;\"\u003e\n\u003cspan style=\"background: #008377CF; color: #fff; padding: 7px 13px; border-radius: 20px; font-size: 12px; font-weight: bold;\"\u003eMPN: ZERO1SW\u003c\/span\u003e \u003cspan style=\"background: #008377CF; color: #fff; padding: 7px 13px; border-radius: 20px; font-size: 12px; font-weight: bold;\"\u003eOpens at 3°C\u003c\/span\u003e \u003cspan style=\"background: #008377CF; color: #fff; padding: 7px 13px; border-radius: 20px; font-size: 12px; font-weight: bold;\"\u003ePart L Compliant\u003c\/span\u003e \u003cspan style=\"background: #008377CF; color: #fff; padding: 7px 13px; border-radius: 20px; font-size: 12px; font-weight: bold;\"\u003eWater-Sensing Element\u003c\/span\u003e \u003cspan style=\"background: #008377CF; color: #fff; padding: 7px 13px; border-radius: 20px; font-size: 12px; font-weight: bold;\"\u003eR290 Compatible\u003c\/span\u003e \u003cspan style=\"background: #008377CF; color: #fff; padding: 7px 13px; border-radius: 20px; font-size: 12px; font-weight: bold;\"\u003ePatented Design\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c!-- Connection callout --\u003e\n\u003cdiv style=\"background: #f0faf9; border-left: 4px solid #008377CF; padding: 12px 16px; margin: 0 0 18px; font-size: 14px; border-radius: 0 4px 4px 0;\"\u003e\n\u003cstrong style=\"color: #008377cf;\"\u003eConnection note:\u003c\/strong\u003e The female swivel outlet allows the valve to be oriented without rotating the male inlet — ideal for connecting to flexible pre-insulated hose (Intaflex) where the hose end can be rotated into alignment during tightening.\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border-left: 4px solid #008377CF; padding: 12px 16px; margin: 0 0 24px; font-size: 14px; border-radius: 0 4px 4px 0;\"\u003e\n\u003cstrong style=\"color: #008377cf;\"\u003eWhy a swivel connection?\u003c\/strong\u003e The swivel connection is the defining feature of the 1SW\/14SW variants. Unlike the inline ZERO001\/ZERO114, the swivel allows rotational alignment of the outlet fitting — essential for Intaflex hose connections and tight-space installations where a fixed outlet would cause torsional stress on pipework.\u003c\/div\u003e\n\u003c!-- Size note callout --\u003e\n\u003cdiv style=\"background: #f0faf9; border-left: 4px solid #008377CF; padding: 12px 16px; margin: 0 0 24px; font-size: 14px; border-radius: 0 4px 4px 0;\"\u003e\n\u003cstrong style=\"color: #008377cf;\"\u003eWhen to choose the ZERO1SW:\u003c\/strong\u003e Best choice when connecting to pre-insulated flexible hose on 28mm \/ 1\" circuits. The female swivel prevents hose twisting during installation.\u003c\/div\u003e\n\u003c!-- Independently tested performance --\u003e\n\u003ch2 style=\"color: #fff; background: #008377CF; padding: 10px 16px; border-radius: 4px; font-size: 16px; margin: 28px 0 16px;\"\u003eIndependently Tested Insulation Performance\u003c\/h2\u003e\n\u003cp style=\"font-size: 14px;\"\u003eInta independently tested the Zero valves at a controlled ambient temperature of -1°C to +1°C with a starting water temperature of 10°C:\u003c\/p\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 24px;\"\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 6px; padding: 14px 16px; text-align: center;\"\u003e\n\u003cp style=\"margin: 0 0 6px; font-weight: bold; color: #008377cf; font-size: 14px;\"\u003eWithout Insulation\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 13px;\"\u003eDischarge temperature: \u003cstrong\u003e2.49°C\u003c\/strong\u003e\u003cbr\u003eTime to discharge: \u003cstrong\u003e1 hour 4 minutes\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #008377CF; border-radius: 6px; padding: 14px 16px; text-align: center; color: #fff;\"\u003e\n\u003cp style=\"margin: 0 0 6px; font-weight: bold; font-size: 14px;\"\u003eWith Insulation ✓\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 13px;\"\u003eDischarge temperature: \u003cstrong\u003e2.03°C\u003c\/strong\u003e\u003cbr\u003eTime to discharge: \u003cstrong\u003e4 hours 3 minutes\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp style=\"font-size: 13px; color: #555; margin-bottom: 24px;\"\u003eInsulation delays discharge (giving more time for the system to respond) and results in a slightly lower discharge temperature — confirming the valve functions correctly and reliably when fully insulated.\u003c\/p\u003e\n\u003c!-- Technical specifications --\u003e\n\u003ch2 style=\"color: #fff; background: #008377CF; padding: 10px 16px; border-radius: 4px; font-size: 16px; margin: 28px 0 16px;\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 14px; margin-bottom: 24px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #008377CF; color: #fff;\"\u003e\n\u003cth style=\"padding: 10px 12px; text-align: left; border: 1px solid #006b62;\"\u003eParameter\u003c\/th\u003e\n\u003cth style=\"padding: 10px 12px; text-align: left; border: 1px solid #006b62;\"\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold;\"\u003eMPN \/ Product code\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003eZERO1SW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold;\"\u003eInlet connection\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003eG1\" male BSP (inlet — to heat pump port or HPBV ball valve)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold;\"\u003eOutlet \/ discharge\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003eG1\" female swivel (outlet — to flexible hose or system pipe) + discharge port downward\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold;\"\u003eKv value\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003e33 m³\/h\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold;\"\u003eMax inlet pressure (static)\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003e10 Bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold;\"\u003eMin inlet pressure\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003e0.5 Bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold;\"\u003eOpening temperature\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003e3°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold;\"\u003eClosing temperature\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003e4°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold;\"\u003eSensitivity\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003e±1°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold;\"\u003eWorking temperature range\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003e0°C to 80°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold;\"\u003eAmbient temperature range\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003e-30°C to 60°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold;\"\u003eMax discharge flow rate @ 3 Bar\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003e1.5 L\/h\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold;\"\u003eMedium\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003eWater\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold;\"\u003eDimensions\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003e74mm tall × 58mm wide (swivel body)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold;\"\u003eThread standard\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003eBS EN ISO 228\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold;\"\u003eValve body material\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003eBrass — BS EN 12165 CW617N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold;\"\u003eSpring\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003eStainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold;\"\u003eTemperature element\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003eWax\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold;\"\u003eInternal seals\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003eEPDM peroxide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold;\"\u003eInternal parts\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003eBrass — BS EN 12164 CW617N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold;\"\u003eR290 refrigerant compatible\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold;\"\u003eManufacturer\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003eIntatec Ltd, Hixon, Staffordshire ST18 0PF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!-- Key features grid --\u003e\n\u003ch2 style=\"color: #fff; background: #008377CF; padding: 10px 16px; border-radius: 4px; font-size: 16px; margin: 28px 0 16px;\"\u003eKey Features\u003c\/h2\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 14px; margin-bottom: 24px;\"\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 6px; padding: 14px 16px;\"\u003e\n\u003cp style=\"margin: 0 0 5px; font-weight: bold; color: #008377cf; font-size: 14px;\"\u003eWater-sensing — not air-sensing\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 13px;\"\u003eThe wax thermostatic element sits directly in the water flow. The valve responds to actual system water temperature — not ambient air — so it operates accurately regardless of weather conditions, wind chill, or the insulation layer around the valve body.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 6px; padding: 14px 16px;\"\u003e\n\u003cp style=\"margin: 0 0 5px; font-weight: bold; color: #008377cf; font-size: 14px;\"\u003eFully insulatable — Part L compliant\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 13px;\"\u003eBuilding Regulations Part L requires all external ASHP fittings to be fully insulated. Because the Zero element sits in the water (not the air), the valve can be completely encased in insulation and sealed — maintaining system efficiency while still discharging reliably at 3°C.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 6px; padding: 14px 16px;\"\u003e\n\u003cp style=\"margin: 0 0 5px; font-weight: bold; color: #008377cf; font-size: 14px;\"\u003eDebris-resistant cartridge design\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 13px;\"\u003eA protective ring around the thermostatic cartridge prevents system debris from settling into the operating mechanism. Double O-rings with reduced-friction surface treatment ensure correct valve operation and reliable sealing even after extended periods without activation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 6px; padding: 14px 16px;\"\u003e\n\u003cp style=\"margin: 0 0 5px; font-weight: bold; color: #008377cf; font-size: 14px;\"\u003eVacuum breaker with ZEROGUARD option\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 13px;\"\u003eThe built-in vacuum breaker prevents backflow contamination and must remain clear at all times. The optional ZEROGUARD cover (sold separately or as part of a ZG bundle) fits over the vacuum breaker, protecting it from debris, insects, and the elements while allowing air flow and annual inspection without disturbing the insulation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 6px; padding: 14px 16px;\"\u003e\n\u003cp style=\"margin: 0 0 5px; font-weight: bold; color: #008377cf; font-size: 14px;\"\u003eChamfered discharge edge\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 13px;\"\u003eThe discharge outlet has a chamfered edge that prevents water droplets forming and freezing at the tip — a subtle but important design detail that maintains free discharge even in sub-zero ambient temperatures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 6px; padding: 14px 16px;\"\u003e\n\u003cp style=\"margin: 0 0 5px; font-weight: bold; color: #008377cf; font-size: 14px;\"\u003eServiceable thermostatic cartridge\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 13px;\"\u003eThe thermostatic cartridge and vacuum breaker are both replaceable in the field using standard spanners (26mm A\/F for cartridge, 20mm A\/F for vacuum breaker), without removing the valve body from the pipework. Replacement parts available from Intatec.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Installation requirements --\u003e\n\u003ch2 style=\"color: #fff; background: #008377CF; padding: 10px 16px; border-radius: 4px; font-size: 16px; margin: 28px 0 16px;\"\u003eInstallation Requirements\u003c\/h2\u003e\n\u003cp style=\"font-size: 14px;\"\u003eThe Zero valve must be installed \u003cstrong\u003eoutdoors, vertically, with the discharge port facing directly downward\u003c\/strong\u003e — never horizontal or inverted. Install as close to the heat pump as possible, on both flow and return pipes. Minimum 150mm clearance between the discharge port and the ground to prevent discharged water refreezing and blocking the outlet. If installing two valves on adjacent pipes, leave at least 100mm between them so discharge from the upper valve cannot fall onto the lower valve.\u003c\/p\u003e\n\u003cp style=\"font-size: 14px;\"\u003eFlush all pipework thoroughly before installation. Do not allow debris, PTFE tape, or metal particles to enter the valve. Avoid installing near heat sources (boilers, flues) which could interfere with the thermostatic element. Avoid any upstream elbow that creates a water trap below the valve, which would prevent complete drainage.\u003c\/p\u003e\n\u003cdiv style=\"background: #fff8e1; border-left: 4px solid #f59e0b; padding: 12px 16px; margin: 14px 0 24px; font-size: 14px; border-radius: 0 4px 4px 0;\"\u003e\n\u003cstrong style=\"color: #b45309;\"\u003eCritical insulation warning:\u003c\/strong\u003e If the ZERO1SW is insulated, \u003cem\u003eall\u003c\/em\u003e external pipework and fittings on the circuit must also be fully insulated and sealed. Partial insulation creates cold spots that can freeze even if the valve itself operates correctly. The anti-vacuum valve (vacuum breaker) must remain clear at all times — use ZEROGUARD to protect it. Inspect insulation and re-seal all joints annually.\u003c\/div\u003e\n\u003c!-- Compatible accessories table --\u003e\n\u003ch2 style=\"color: #fff; background: #008377CF; padding: 10px 16px; border-radius: 4px; font-size: 16px; margin: 28px 0 16px;\"\u003eCompatible Accessories (Intatec)\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 14px; margin-bottom: 24px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #008377CF; color: #fff;\"\u003e\n\u003cth style=\"padding: 10px 12px; text-align: left; border: 1px solid #006b62;\"\u003eCode\u003c\/th\u003e\n\u003cth style=\"padding: 10px 12px; text-align: left; border: 1px solid #006b62;\"\u003eDescription\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold; color: #008377;\"\u003eZEROGUARD\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003eAnti-vacuum valve protector — two-part push-fit cover for the vacuum breaker\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold; color: #008377;\"\u003eINSULZERO28SW\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003ePre-formed insulation jacket specifically for 1\" swivel Zero valve (ZERO1SW)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold; color: #008377;\"\u003eINSULBOND\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003e290ml Bond \u0026amp; Seal — for sealing insulation joints around the valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold; color: #008377;\"\u003eZERO1SWZG\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003eZERO1SW pre-bundled with ZEROGUARD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3; font-weight: bold; color: #008377;\"\u003eHPBV11\u003c\/td\u003e\n\u003ctd style=\"padding: 9px 12px; border: 1px solid #c8e6e3;\"\u003eHeat pump extended key ball valve 1\" — installs between heat pump and ZERO1SW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!-- FAQ --\u003e\n\u003ch2 style=\"color: #fff; background: #008377CF; padding: 10px 16px; border-radius: 4px; font-size: 16px; margin: 28px 0 16px;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv style=\"margin-bottom: 14px; border-left: 3px solid #008377CF; padding-left: 14px;\"\u003e\n\u003cp style=\"font-weight: bold; color: #008377cf; margin-bottom: 4px;\"\u003eHow many ZERO1SW valves do I need?\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 14px;\"\u003eInta recommend fitting one valve on both the flow and return pipework — so a standard heat pump installation requires two ZERO1SW valves. The valve is sold individually; order two for a complete installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 14px; border-left: 3px solid #008377CF; padding-left: 14px;\"\u003e\n\u003cp style=\"font-weight: bold; color: #008377cf; margin-bottom: 4px;\"\u003eDoes the ZERO1SW need to be insulated?\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 14px;\"\u003eBuilding Regulations Part L requires all external heat pump pipework and fittings to be fully insulated. Use the INSULZERO28SW pre-formed insulation jacket (sold separately) with INSULBOND 290ml Bond \u0026amp; Seal to fully encapsulate the valve. Only the ZEROGUARD-protected vacuum breaker and the discharge port tip should remain exposed. Insulation must be inspected and resealed annually.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 14px; border-left: 3px solid #008377CF; padding-left: 14px;\"\u003e\n\u003cp style=\"font-weight: bold; color: #008377cf; margin-bottom: 4px;\"\u003eWhy does the ZERO1SW have a ZEROGUARD version (ZERO1SWZG)?\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 14px;\"\u003eThe ZERO1SWZG is simply the ZERO1SW supplied pre-paired with a ZEROGUARD vacuum breaker cover. Inta recommend always using a ZEROGUARD, so the ZG bundle saves a separate order and ensures the correct cover is to hand at installation. The cover can also be purchased separately if you already have the valve.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 14px; border-left: 3px solid #008377CF; padding-left: 14px;\"\u003e\n\u003cp style=\"font-weight: bold; color: #008377cf; margin-bottom: 4px;\"\u003eWhat does the vacuum breaker do and can it be serviced?\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 14px;\"\u003eThe vacuum breaker (anti-vacuum valve) prevents a negative pressure siphon from drawing contaminated water back into the system after discharge. It must remain clear and unobstructed at all times. It can be removed for inspection or replacement using a 20mm A\/F spanner — without removing the valve body from the pipework. The plastic vacuum cap should fall free when the body is inverted; if it does not, the vacuum breaker needs replacing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 14px; border-left: 3px solid #008377CF; padding-left: 14px;\"\u003e\n\u003cp style=\"font-weight: bold; color: #008377cf; margin-bottom: 4px;\"\u003eCan the thermostatic cartridge be replaced on site?\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 14px;\"\u003eYes — using a 26mm A\/F spanner to unscrew the cartridge from the valve body. Only fit genuine Inta replacement cartridges. If the valve keeps discharging without the water temperature dropping to 3°C, check that the valve is not located near a heat source, that the vacuum breaker is not blocked, and that insulation has not been applied incorrectly. If the fault persists, replace the cartridge.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Warning box --\u003e\n\u003cdiv style=\"background: #fff8e1; border-left: 4px solid #f59e0b; padding: 12px 16px; margin: 0 0 24px; font-size: 14px; border-radius: 0 4px 4px 0;\"\u003e\n\u003cstrong style=\"color: #b45309;\"\u003eDo not install indoors, horizontally, or inverted.\u003c\/strong\u003e The ZERO1SW must be installed outdoors, vertically, discharge pointing down. Indoor installation prevents the valve from operating when the heat pump stops — the water inside will not cool to 3°C as quickly indoors. Installing horizontally or inverted prevents discharged water from draining freely and can cause the discharge port to freeze.\u003c\/div\u003e\n\u003c!-- Related products footer --\u003e\n\u003cdiv style=\"background: #008377CF; color: #fff; padding: 16px 20px; border-radius: 4px; margin-top: 32px; font-size: 14px; line-height: 1.9;\"\u003e\n\u003cstrong\u003eRelated Products:\u003c\/strong\u003e\u003cbr\u003eIntatec ZERO14SW Anti-Freeze Valve 1¼\" swivel companion for 35mm \/ larger port systems | Intatec ZEROGUARD Anti-Vacuum Valve Protector | INSULZERO28SW Insulation Jacket | INSULBOND 290ml Bond \u0026amp; Seal | Intatec HPBV11 Heat Pump Ball Valve | Intatec IntaKlean HP Magnetic Filter\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Inta","offers":[{"title":"Default Title","offer_id":63899230994781,"sku":"ZERO1SW","price":135.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/IntatecZERO1SWHeatPumpAnti-FreezeValve_1Malex1FemaleSwivel.webp?v=1773807944","url":"https:\/\/qualityheating.co.uk\/products\/intatec-zero1sw-heat-pump-anti-freeze-valve-1-male-1-female-swivel","provider":"AIZO Quality Heating","version":"1.0","type":"link"}