{"product_id":"honeywell-home-28mm-2-port-motorised-zone-valve-v4043h1106-u","title":"Honeywell Home V4043H1106 28mm 2-Port Motorised Zone Valve — Large Bore Central Heating Zone Control","description":"\u003cdiv style=\"font-size:16px;font-family:Arial,Helvetica,sans-serif;color:#1a1a1a;max-width:900px;margin:0 auto;line-height:1.6;\"\u003e\n  \u003cp style=\"margin:0 0 18px;\"\u003e\n    The \u003cstrong\u003eHoneywell Home V4043H1106\/U\u003c\/strong\u003e is a \u003cstrong\u003e28mm two-port motorised zone valve\u003c\/strong\u003e for domestic and light commercial central heating systems requiring larger-bore pipework — the 28mm version of the industry-standard V4043H series. Motor open and spring return, with a \u003cstrong\u003enormally closed fail-safe position\u003c\/strong\u003e, a \u003cstrong\u003epotential-free SPST end switch\u003c\/strong\u003e for boiler and pump control, and a \u003cstrong\u003ereplaceable powerhead that does not require draining the system\u003c\/strong\u003e. Suitable for use on main heating flow and return pipework, high-flow primary circuits, and larger domestic installations where 28mm pipework is specified. Manual lever for filling and draining. 1 metre heat-resistant flying lead. Maximum static pressure \u003cstrong\u003e8.6 bar\u003c\/strong\u003e; Kv value \u003cstrong\u003e8.6\u003c\/strong\u003e; fluid temperature \u003cstrong\u003e+5°C to +88°C\u003c\/strong\u003e.\n  \u003c\/p\u003e\n  \u003cdiv style=\"border-left:4px solid #008377CF;background:#e6f4f3;padding:10px 16px;margin-bottom:22px;border-radius:0 6px 6px 0;\"\u003e\n    \u003cstrong style=\"color:#005c54;\"\u003eℹ 22mm vs 28mm — When to use the 28mm valve\u003c\/strong\u003e\u003cbr\u003e\n    The \u003cstrong\u003e22mm V4043H1056\u003c\/strong\u003e is specified for the majority of domestic S-plan and Y-plan zone control applications on standard 22mm branch pipework. The \u003cstrong\u003e28mm V4043H1106\u003c\/strong\u003e is specified where the zone circuit pipework is 28mm — typically on the main heating flow and return in larger properties, heat pump primary circuits, underfloor heating manifold feeds, or any installation where a larger Kv is needed to avoid excessive pressure drop across the zone valve.\n  \u003c\/div\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;font-weight:600;font-size:15px;padding:10px 16px;border-radius:6px 6px 0 0;\"\u003eFeatures \u0026amp; Benefits\u003c\/div\u003e\n  \u003cdiv style=\"display:grid;grid-template-columns:repeat(auto-fill,minmax(255px,1fr));gap:12px;background:#e6f4f3;padding:14px;border-radius:0 0 6px 6px;margin-bottom:22px;\"\u003e\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:13px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;margin-bottom:5px;\"\u003e✔ Motor Open, Spring Return — Fail-Safe Closed\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eThe V4043H uses a \u003cstrong\u003emotor to open the valve and a return spring to close it\u003c\/strong\u003e. When the wiring centre calls for heat and sends power to the valve, the motor drives the valve open over approximately 12 seconds; when the call ends and power is removed, the return spring snaps the valve closed in about 5–6 seconds — no electrical power required to close. This \u003cstrong\u003enormally closed, fail-safe design\u003c\/strong\u003e means that in the event of a power failure or wiring fault, the valve defaults to closed, preventing uncontrolled heating circulation.\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:13px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;margin-bottom:5px;\"\u003e✔ Potential-Free End Switch — Boiler \u0026amp; Pump Control\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eThe \u003cstrong\u003epotential-free (volt-free) auxiliary end switch\u003c\/strong\u003e closes as the valve reaches its fully open position. This switch signal is used to fire the boiler and\/or start the circulating pump — ensuring the boiler only fires when at least one zone valve is fully open and water is circulating. This is the fundamental boiler interlock mechanism in S-plan and Y-plan wiring configurations. The end switch must be wired to the boiler's live connection (via the wiring centre) to achieve Part L-compliant boiler interlock. The 28mm body is suited to \u003cstrong\u003elarger primary circuits, high-flow systems, and main heating flow and return pipework\u003c\/strong\u003e where greater Kv capacity is required.\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:13px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;margin-bottom:5px;\"\u003e✔ Replaceable Powerhead — No Drain-Down\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eThe \u003cstrong\u003emotor head (powerhead) can be removed and replaced without draining the heating system\u003c\/strong\u003e. The valve body remains in the pipework; the motorised head clips or screws on and off independently. If the motor fails — by far the most common V4043 failure — the entire valve does not need to be cut out of the pipework. The powerhead can be swapped in minutes with the system full and under pressure, making maintenance on a live system fast and cost-effective.\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:13px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;margin-bottom:5px;\"\u003e✔ Manual Lever — Filling and Draining\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eA \u003cstrong\u003emanual lever on the valve body\u003c\/strong\u003e allows the valve to be held open manually when filling or draining the heating system — without requiring electrical power to the actuator. This is essential during commissioning (the system needs to circulate water for flushing and chemical treatment) and during drain-down for maintenance on other components. Push the lever to open manually; release to allow the return spring to close.\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:13px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;margin-bottom:5px;\"\u003e✔ Quiet Operation — 5W Power Consumption\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eThe synchronous motor is designed for \u003cstrong\u003enear-silent operation\u003c\/strong\u003e — the only noise during opening is a brief mechanical engagement, not a continuous motor whine. Once fully open, the motor stalls and the end switch holds the boiler on; there is no continuous motor running sound during the heating period. At only \u003cstrong\u003e5W power consumption\u003c\/strong\u003e, the valve adds negligible electrical load — far less than the boiler's control electronics.\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:13px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;margin-bottom:5px;\"\u003e✔ 28mm Compression — Industry Standard\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eStandard \u003cstrong\u003e28mm compression fittings\u003c\/strong\u003e — the V4043H is the most widely installed motorised zone valve in the UK and is the valve that all standard wiring centre diagrams, S-plan and Y-plan configurations, and installer training are based around. Being the default component in UK heating design means replacement availability is guaranteed and any qualified plumber or heating engineer will be able to install, wire, and commission it correctly without reference to unusual procedures.\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;font-weight:600;font-size:15px;padding:10px 16px;border-radius:6px 6px 0 0;\"\u003eTechnical Specifications\u003c\/div\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;margin-bottom:8px;font-size:14px;\"\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;width:44%;border-bottom:1px solid #c8e6e3;\"\u003eManufacturer \/ Part No.\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eHoneywell Home (Resideo) — \u003cstrong\u003eV4043H1106\/U\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eConnection Size\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e28mm compression\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eNumber of Ports\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e2-port (on\/off)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eDe-energised State\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e\n\u003cstrong\u003eNormally CLOSED\u003c\/strong\u003e (spring return)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eAction\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eMotor open — spring return\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e220–240V AC, 50\/60Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003ePower Consumption\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e5W\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eEnd Switch Type\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eSPST — potential-free\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eOpening Time\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e12 seconds (nominal)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eClosing Time\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e5–6 seconds (spring return)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eMax Static Pressure\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e8.6 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eMax Differential Pressure (close-off)\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e0.45 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eKv Value\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e8.6\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eFluid Temperature Range\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e+5°C to +88°C\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eMax Ambient Temperature\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e+52°C\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eElectrical Connection\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e1.0m heat-resistant flying lead, 6-core\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eDimensions (H × W × D)\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e98 × 117 × 60 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;\"\u003eFlow Direction\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;\"\u003eAs per arrow on valve body\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":62799246328157,"sku":"V4043H1106","price":109.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/HoneywellV4043H1056U2PortMotorisedZoneValve22mmV4043H1056U.jpg?v=1764917360","url":"https:\/\/qualityheating.co.uk\/products\/honeywell-home-28mm-2-port-motorised-zone-valve-v4043h1106-u","provider":"AIZO Quality Heating","version":"1.0","type":"link"}