{"product_id":"ariston-nuos-plus-s2-wi-fi-200l-heat-pump-water-heater-unvented-kit","title":"Ariston Nuos Plus S2 Wi-Fi 200L Heat Pump Water Heater + Unvented Kit","description":"\u003cdiv style=\"font-size:16px; font-family:Georgia,'Times New Roman',serif; color:#1a1a1a; max-width:900px; margin:0 auto; padding:0 16px;\"\u003e\n\n  \u003cp style=\"font-size:17px; line-height:1.75; margin:0 0 20px;\"\u003e\n    The \u003cstrong\u003eAriston Nuos Plus S2 Wi-Fi 200D\u003c\/strong\u003e is a next-generation \u003cstrong\u003efloor-standing air source heat pump water heater\u003c\/strong\u003e using the natural refrigerant \u003cstrong\u003eR290 (propane)\u003c\/strong\u003e — with a global warming potential of just 3 — to deliver reliable domestic hot water at up to \u003cstrong\u003e80% lower running cost\u003c\/strong\u003e than a conventional electric immersion cylinder. Supplied complete with an \u003cstrong\u003eunvented safety kit\u003c\/strong\u003e, this \u003cstrong\u003e200-litre direct model\u003c\/strong\u003e earns an \u003cstrong\u003eErP A+ energy rating\u003c\/strong\u003e (tapping profile L) and achieves a \u003cstrong\u003eCOP of 3.16\u003c\/strong\u003e at the EN 16147 test condition of 7 °C air — meaning every unit of electricity drives more than three units of heat into your hot water. No F-Gas handling qualification is required for installation.\n  \u003c\/p\u003e\n\n  \u003cdiv style=\"display:flex; flex-wrap:wrap; gap:12px; margin:0 0 28px;\"\u003e\n    \u003cdiv style=\"flex:1 1 130px; background:#008377CF; color:#fff; border-radius:8px; padding:16px 14px; text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:28px; font-weight:700; line-height:1;\"\u003e3.16\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px; margin-top:4px; opacity:.9;\"\u003eCOP @ 7 °C air\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1 1 130px; background:#008377CF; color:#fff; border-radius:8px; padding:16px 14px; text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:28px; font-weight:700; line-height:1;\"\u003eA+\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px; margin-top:4px; opacity:.9;\"\u003eErP Energy Rating\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1 1 130px; background:#008377CF; color:#fff; border-radius:8px; padding:16px 14px; text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:28px; font-weight:700; line-height:1;\"\u003e200 L\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px; margin-top:4px; opacity:.9;\"\u003eTank Capacity\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1 1 130px; background:#008377CF; color:#fff; border-radius:8px; padding:16px 14px; text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:28px; font-weight:700; line-height:1;\"\u003e48 dB\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px; margin-top:4px; opacity:.9;\"\u003eIndoor Sound Level\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1 1 130px; background:#008377CF; color:#fff; border-radius:8px; padding:16px 14px; text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:28px; font-weight:700; line-height:1;\"\u003eR290\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px; margin-top:4px; opacity:.9;\"\u003eGWP = 3 Refrigerant\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1 1 130px; background:#008377CF; color:#fff; border-radius:8px; padding:16px 14px; text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:28px; font-weight:700; line-height:1;\"\u003e781\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px; margin-top:4px; opacity:.9;\"\u003ekWh\/year (avg climate)\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"border-left:4px solid #c0392b; background:#fdf3f2; border-radius:0 6px 6px 0; padding:13px 16px; margin:0 0 14px;\"\u003e\n    \u003cstrong style=\"color:#c0392b;\"\u003e⚠ Installer Note — R290 Flammable Refrigerant:\u003c\/strong\u003e R290 is a class A3 flammable refrigerant. Installation and commissioning \u003cstrong\u003emust be carried out by a suitably competent engineer\u003c\/strong\u003e trained in safe working with flammable refrigerants (BS EN 378, IEC 60335-2-40 Annex CC). The room must have a \u003cstrong\u003eminimum volume of 20 m³\u003c\/strong\u003e with adequate ventilation. Do not install in a room containing any open-flued gas appliance.\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"border-left:4px solid #e67e22; background:#fef9f0; border-radius:0 6px 6px 0; padding:13px 16px; margin:0 0 14px;\"\u003e\n    \u003cstrong style=\"color:#e67e22;\"\u003e⚡ Unvented System — G3 Competency Required:\u003c\/strong\u003e Supplied with an unvented kit and classified as a G3 unvented hot water storage system. Installation \u003cstrong\u003emust be performed by an approved installer holding a current G3 qualification\u003c\/strong\u003e, notified to Building Control under Part G of the Building Regulations. All discharge pipework must comply with BS 8558.\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"border-left:4px solid #008377CF; background:#e6f4f3; border-radius:0 6px 6px 0; padding:13px 16px; margin:0 0 28px;\"\u003e\n    \u003cstrong style=\"color:#005c54;\"\u003eⓘ 200D — Direct Model:\u003c\/strong\u003e The 200D has a \u003cstrong\u003edirect tank configuration\u003c\/strong\u003e with no secondary coil — heated exclusively by the integrated heat pump and 1800 W backup immersion element. Ideal for \u003cstrong\u003estandalone installation\u003c\/strong\u003e without a solar thermal or boiler circuit. For system integration requiring an indirect coil, see the \u003cstrong\u003e250I (MPN 4057139)\u003c\/strong\u003e.\n  \u003c\/div\u003e\n\n  \u003ch3 style=\"font-size:17px; font-weight:700; color:#005c54; border-bottom:2px solid #008377CF; padding-bottom:6px; margin:0 0 18px;\"\u003eKey Features\u003c\/h3\u003e\n  \u003cdiv style=\"display:grid; grid-template-columns:repeat(auto-fill,minmax(260px,1fr)); gap:14px; margin:0 0 32px;\"\u003e\n\n    \u003cdiv style=\"border:1px solid #d4e8e6; border-radius:8px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#005c54; margin-bottom:6px;\"\u003eNear-Zero Carbon Refrigerant\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:15px; line-height:1.6;\"\u003eUses \u003cstrong\u003eR290 natural refrigerant\u003c\/strong\u003e with a GWP of just 3 — more than 470 times lower than the R134a used in previous-generation models. The factory-sealed, pre-charged circuit contributes to near-zero direct emissions over the product's lifetime and is \u003cstrong\u003efuture-proofed against F-Gas regulation\u003c\/strong\u003e changes.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"border:1px solid #d4e8e6; border-radius:8px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#005c54; margin-bottom:6px;\"\u003eA+ Efficiency — 80% Energy Saving\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:15px; line-height:1.6;\"\u003eAchieves \u003cstrong\u003eErP A+ (tapping profile L)\u003c\/strong\u003e and an annual electricity consumption of just \u003cstrong\u003e781 kWh\u003c\/strong\u003e under average UK climate conditions — delivering over 80% energy savings compared with a conventional electric storage water heater of the same capacity.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"border:1px solid #d4e8e6; border-radius:8px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#005c54; margin-bottom:6px;\"\u003eBuilt-in Wi-Fi \u0026amp; Ariston Net App\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:15px; line-height:1.6;\"\u003e\u003cstrong\u003eIntegrated Wi-Fi gateway\u003c\/strong\u003e connects to the \u003cstrong\u003eAriston Net smartphone app\u003c\/strong\u003e (iOS \u0026amp; Android) straight from the box — no separate dongle required. Monitor and adjust temperature, create heating schedules, track energy use, and receive alerts remotely. \u003cstrong\u003eOptional voice control\u003c\/strong\u003e is supported.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"border:1px solid #d4e8e6; border-radius:8px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#005c54; margin-bottom:6px;\"\u003eIntegrated Solar PV Function\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:15px; line-height:1.6;\"\u003eDedicated \u003cstrong\u003eSG1\/SG2 Smart Grid signal inputs\u003c\/strong\u003e allow the unit to detect surplus solar PV generation and automatically switch to a boosted heating mode — maximising self-consumption without requiring a separate immersion diverter device. The PV setpoint temperature is fully configurable.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"border:1px solid #d4e8e6; border-radius:8px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#005c54; margin-bottom:6px;\"\u003eSuper Quiet — 48 dB(A)\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:15px; line-height:1.6;\"\u003eOperates at just \u003cstrong\u003e48 dB(A)\u003c\/strong\u003e — quieter than the previous Nuos generation and comparable to a quiet office environment. An optional \u003cstrong\u003eNight function\u003c\/strong\u003e reduces fan speed further for overnight operation, making it suitable for utility rooms near living or sleeping spaces.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"border:1px solid #d4e8e6; border-radius:8px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#005c54; margin-bottom:6px;\"\u003eSmart Operating Modes inc. i-Memory\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:15px; line-height:1.6;\"\u003eOffers \u003cstrong\u003eGreen\u003c\/strong\u003e (heat pump only), \u003cstrong\u003eGreen+\u003c\/strong\u003e, \u003cstrong\u003eBoost\u003c\/strong\u003e (heat pump + element simultaneously for fastest recovery), \u003cstrong\u003eComfort\u003c\/strong\u003e, \u003cstrong\u003ei-Memory\u003c\/strong\u003e (learns four weeks of household hot water habits), weekly programme schedules, and an \u003cstrong\u003eAnti-Legionella\u003c\/strong\u003e automatic thermal sanitisation cycle.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"border:1px solid #d4e8e6; border-radius:8px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#005c54; margin-bottom:6px;\"\u003eTitanshield Tank Protection\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:15px; line-height:1.6;\"\u003eThe enamelled steel tank features \u003cstrong\u003eTitanshield anti-corrosion enamel technology\u003c\/strong\u003e combined with a \u003cstrong\u003ereplaceable sacrificial magnesium anode\u003c\/strong\u003e. The anode is accessible via a dedicated flange without draining the cylinder, keeping servicing quick and straightforward.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"border:1px solid #d4e8e6; border-radius:8px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#005c54; margin-bottom:6px;\"\u003eWide Ambient Range: −10 °C to +42 °C\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:15px; line-height:1.6;\"\u003eA \u003cstrong\u003ehot-gas defrost valve\u003c\/strong\u003e prevents condenser freeze-up, allowing continuous heat pump operation down to \u003cstrong\u003e−10 °C ambient\u003c\/strong\u003e. Maximum operating temperature is +42 °C, making it equally suited to warm plant rooms or loft installations. Below the heat pump range, the 1800 W backup element maintains hot water automatically.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"border:1px solid #d4e8e6; border-radius:8px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#005c54; margin-bottom:6px;\"\u003eBusBridgeNet System Integration\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:15px; line-height:1.6;\"\u003eCompatible with \u003cstrong\u003eAriston BusBridgeNet\u003c\/strong\u003e — connects to Sensys HD controllers and other BusBridgeNet-enabled Ariston products (boilers, heat pumps, solar systems) over a single shared bus. This enables coordinated control of heating and domestic hot water from the Ariston Net app or a Sensys HD remote control.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"border:1px solid #d4e8e6; border-radius:8px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#005c54; margin-bottom:6px;\"\u003eComplete Unvented Kit Included\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:15px; line-height:1.6;\"\u003eSupplied complete with a \u003cstrong\u003eG3-compliant unvented safety kit\u003c\/strong\u003e — pressure reducing valve, expansion vessel, temperature and pressure relief valve (TPRV), combination PRV, and tundish — reducing installer procurement time and ensuring all safety components are correctly rated for this cylinder.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"border:1px solid #d4e8e6; border-radius:8px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#005c54; margin-bottom:6px;\"\u003eFlexible 150\/160\/200 mm Ducting\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:15px; line-height:1.6;\"\u003eAir inlet and exhaust connections accept \u003cstrong\u003e150, 160, or 200 mm duct\u003c\/strong\u003e (PVC or PEHD) with up to \u003cstrong\u003e189 Pa available static pressure\u003c\/strong\u003e for long duct runs. Can also operate \u003cstrong\u003ewithout ducting\u003c\/strong\u003e in rooms of at least 20 m³ — a significantly lower threshold than the previous 30 m³ generation requirement.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"border:1px solid #d4e8e6; border-radius:8px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#005c54; margin-bottom:6px;\"\u003eNo F-Gas Qualification Required\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:15px; line-height:1.6;\"\u003eThe \u003cstrong\u003esealed R290 refrigerant circuit is factory-charged\u003c\/strong\u003e and does not require field handling of refrigerant gas — so \u003cstrong\u003eno F-Gas handling certification\u003c\/strong\u003e is needed to install this unit. Installers do need to demonstrate competency in safe handling of flammable refrigerant systems, and a G3 qualification remains mandatory for the unvented works.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\n  \u003ch3 style=\"font-size:17px; font-weight:700; color:#005c54; border-bottom:2px solid #008377CF; padding-bottom:6px; margin:0 0 16px;\"\u003eTechnical Specifications — Nuos Plus S2 Wi-Fi 200D\u003c\/h3\u003e\n  \u003ctable style=\"width:100%; border-collapse:collapse; font-size:15px; margin:0 0 32px;\"\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"background:#008377CF; color:#fff;\"\u003e\n        \u003ctd colspan=\"2\" style=\"padding:10px 12px; font-weight:700; font-size:14px; letter-spacing:.05em;\"\u003eGENERAL\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f5fbfb;\"\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; width:55%;\"\u003eMPN \/ Product Code\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e4057138\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eModel\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003eNuos Plus S2 Wi-Fi 200D + Unvented Kit\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f5fbfb;\"\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eTank Configuration\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003eDirect (no secondary coil)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eRated Tank Capacity\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e200 litres\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f5fbfb;\"\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eErP Energy Class (DHW)\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003eA+ (tapping profile L)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eAnnual Electricity Consumption (average climate)\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e781 kWh\/year\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f5fbfb;\"\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eWeight (empty)\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e90 kg\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eDimensions (H x W x D)\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e1671 x 635 x 653 mm\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f5fbfb;\"\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eInsulation Thickness\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003eapprox 50 mm polyurethane (CFC\/HCFC-free)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eInternal Tank Protection\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003eTitanshield enamel + sacrificial magnesium anode\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f5fbfb;\"\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eMax Operating Pressure\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e0.6 MPa (6 bar)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eHydraulic Connections\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e3\/4\" BSP — cold inlet \/ hot outlet\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#008377CF; color:#fff;\"\u003e\n        \u003ctd colspan=\"2\" style=\"padding:10px 12px; font-weight:700; font-size:14px; letter-spacing:.05em;\"\u003eHEAT PUMP\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f5fbfb;\"\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eRefrigerant\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003eR290 (propane) — GWP = 3\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eRefrigerant Charge\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e0.15 kg\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f5fbfb;\"\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eCOP at 7 C air \/ 10 C inlet \/ 55 C set (EN 16147)\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e3.16\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eHeating Time (EN 16147, 7 C air)\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e8 hr 08 min\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f5fbfb;\"\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eMax Electrical Power (heat pump)\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e600 W\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eMax Water Temperature (heat pump mode)\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e65 C\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f5fbfb;\"\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eAmbient Operating Range\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e-10 C to +42 C\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eMixed Water at 40 C (V40, EN 812\/2013)\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e278 litres\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f5fbfb;\"\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eStanding Losses (Pes)\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e24 W\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#008377CF; color:#fff;\"\u003e\n        \u003ctd colspan=\"2\" style=\"padding:10px 12px; font-weight:700; font-size:14px; letter-spacing:.05em;\"\u003eAIR CIRCUIT\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f5fbfb;\"\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eStandard Air Flow Rate\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e380 m3\/h (auto modulating)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eAvailable Static Pressure\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e189 Pa\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f5fbfb;\"\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eDuct Diameters Accepted\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e150 mm \/ 160 mm \/ 200 mm\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eMinimum Room Volume (unducted)\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e20 m3\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f5fbfb;\"\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eIndoor Sound Power Level\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e48 dB(A) (EN 12102-2, ducted Ø200)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#008377CF; color:#fff;\"\u003e\n        \u003ctd colspan=\"2\" style=\"padding:10px 12px; font-weight:700; font-size:14px; letter-spacing:.05em;\"\u003eELECTRICAL AND BACKUP ELEMENT\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f5fbfb;\"\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003ePower Supply\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e220-240 V ~ 50 Hz, single phase\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eMax Total Power Consumption\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e2400 W\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f5fbfb;\"\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eBackup Heating Element\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e1800 W steatite immersion\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eMax Water Temperature (element mode)\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e65 C (factory set)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f5fbfb;\"\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eMax Current Consumption\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003e10.5 A\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6;\"\u003eProtection Rating\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px; border-bottom:1px solid #d4e8e6; font-weight:600;\"\u003eIPX4\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3 style=\"font-size:17px; font-weight:700; color:#005c54; border-bottom:2px solid #008377CF; padding-bottom:6px; margin:0 0 16px;\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n  \u003cdetails style=\"border:1px solid #d4e8e6; border-radius:8px; margin-bottom:10px; overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF; color:#fff; padding:13px 16px; font-weight:600; cursor:pointer; list-style:none;\"\u003eDoes installation of the Nuos Plus S2 Wi-Fi 200D require F-Gas certification?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px; font-size:15px; line-height:1.7;\"\u003eNo F-Gas handling certificate is required. The \u003cstrong\u003esealed R290 refrigerant circuit is factory-charged\u003c\/strong\u003e — the engineer does not open or handle the refrigerant circuit on site. However, because R290 is class A3 (highly flammable), installers must be \u003cstrong\u003ecompetent in safe working with flammable refrigerant systems\u003c\/strong\u003e in line with BS EN 378 and IEC 60335-2-40 Annex CC, and must ensure the installation environment is free of ignition sources. A \u003cstrong\u003eseparate G3 qualification remains mandatory\u003c\/strong\u003e for the unvented cylinder work.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #d4e8e6; border-radius:8px; margin-bottom:10px; overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF; color:#fff; padding:13px 16px; font-weight:600; cursor:pointer; list-style:none;\"\u003eWhat is the minimum room size for unducted installation?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px; font-size:15px; line-height:1.7;\"\u003eThe unit requires a \u003cstrong\u003eminimum room volume of 20 m³\u003c\/strong\u003e for unducted (free-air) operation — smaller than the previous Nuos generation (30 m³), making it suitable for more compact utility rooms and plant rooms. The space must be \u003cstrong\u003eadequately ventilated\u003c\/strong\u003e and must not contain open-flued gas appliances. For smaller spaces, air intake and exhaust can be ducted to an external wall (150, 160, or 200 mm duct, up to 189 Pa total pressure drop).\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #d4e8e6; border-radius:8px; margin-bottom:10px; overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF; color:#fff; padding:13px 16px; font-weight:600; cursor:pointer; list-style:none;\"\u003eCan the 200D work with a solar PV system?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px; font-size:15px; line-height:1.7;\"\u003eYes. The Nuos Plus S2 Wi-Fi has an \u003cstrong\u003eintegrated photovoltaic function\u003c\/strong\u003e. When a surplus signal is detected via the \u003cstrong\u003eSG1 or SG2 inputs\u003c\/strong\u003e (or a Smart Grid contact), the unit switches to a boosted heating mode to absorb excess solar generation. The target temperature used during PV surplus periods (PV SET parameter) is adjustable by the installer. No separate energy diverter device is required, though one can be used if preferred by the installer.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #d4e8e6; border-radius:8px; margin-bottom:10px; overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF; color:#fff; padding:13px 16px; font-weight:600; cursor:pointer; list-style:none;\"\u003eWhat is the difference between the 200D and the 250I?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px; font-size:15px; line-height:1.7;\"\u003eThe \u003cstrong\u003e200D (MPN 4057138)\u003c\/strong\u003e is a 200-litre \u003cstrong\u003edirect\u003c\/strong\u003e cylinder — heated solely by the integrated heat pump and 1800 W backup element, with no secondary coil. The \u003cstrong\u003e250I (MPN 4057139)\u003c\/strong\u003e is a 245-litre \u003cstrong\u003eindirect\u003c\/strong\u003e cylinder fitted with a \u003cstrong\u003e0.65 m² heat-exchange coil\u003c\/strong\u003e that accepts heat from a solar thermal system, boiler, or other primary heat generator via a closed primary circuit. The 250I is taller (1931 mm vs 1671 mm), heavier (123 kg vs 90 kg), and achieves a higher COP of 3.51 at the same test condition.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #d4e8e6; border-radius:8px; margin-bottom:10px; overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF; color:#fff; padding:13px 16px; font-weight:600; cursor:pointer; list-style:none;\"\u003eHow does i-Memory mode work?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px; font-size:15px; line-height:1.7;\"\u003e\n\u003cstrong\u003ei-Memory\u003c\/strong\u003e is a learning algorithm that monitors the household's actual hot water usage patterns over a \u003cstrong\u003erolling four-week window\u003c\/strong\u003e. During the first week it operates at a constant set-point; from the second week onwards, it automatically adjusts the heating schedule to have sufficient hot water ready whenever it is typically needed — while avoiding unnecessary reheating during low-demand periods. The learned profile can be reset at any time via parameter U9 in the user menu.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #d4e8e6; border-radius:8px; margin-bottom:10px; overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF; color:#fff; padding:13px 16px; font-weight:600; cursor:pointer; list-style:none;\"\u003eWhat is included in the unvented kit supplied with MPN 4057138?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px; font-size:15px; line-height:1.7;\"\u003eThe bundled unvented kit contains the components required for G3-compliant installation as a closed unvented hot water storage system, including a \u003cstrong\u003epressure reducing valve, expansion vessel, temperature and pressure relief valve (TPRV), combination PRV, and tundish\u003c\/strong\u003e. The tundish must be installed vertically within 750 mm of the TPRV and in a position visible to building occupants. Discharge pipework from the tundish to a safe termination point is not included and must be provided on site by the installer.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n\u003c\/div\u003e","brand":"Ariston","offers":[{"title":"Default Title","offer_id":64736294699357,"sku":"4057138","price":2300.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/AristonNuosPlusS2Wi-FiHeatPumpWaterHeater.webp?v=1779179402","url":"https:\/\/qualityheating.co.uk\/products\/ariston-nuos-plus-s2-wi-fi-200l-heat-pump-water-heater-unvented-kit","provider":"AIZO Quality Heating","version":"1.0","type":"link"}