Ariston Nuos Plus S2 Wi-Fi 200L Heat Pump Water Heater + Unvented Kit
The Ariston Nuos Plus S2 Wi-Fi 200D is a next-generation floor-standing air source heat pump water heater using the natural refrigerant R290 (propane) — with a global warming potential of just 3 — to deliver reliable domestic hot water at up to 80% lower running cost than a conventional electric immersion cylinder. Supplied complete with an unvented safety kit, this 200-litre direct model earns an ErP A+ energy rating (tapping profile L) and achieves a COP of 3.16 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.
Key Features
Uses R290 natural refrigerant 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 future-proofed against F-Gas regulation changes.
Achieves ErP A+ (tapping profile L) and an annual electricity consumption of just 781 kWh under average UK climate conditions — delivering over 80% energy savings compared with a conventional electric storage water heater of the same capacity.
Integrated Wi-Fi gateway connects to the Ariston Net smartphone app (iOS & Android) straight from the box — no separate dongle required. Monitor and adjust temperature, create heating schedules, track energy use, and receive alerts remotely. Optional voice control is supported.
Dedicated SG1/SG2 Smart Grid signal inputs 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.
Operates at just 48 dB(A) — quieter than the previous Nuos generation and comparable to a quiet office environment. An optional Night function reduces fan speed further for overnight operation, making it suitable for utility rooms near living or sleeping spaces.
Offers Green (heat pump only), Green+, Boost (heat pump + element simultaneously for fastest recovery), Comfort, i-Memory (learns four weeks of household hot water habits), weekly programme schedules, and an Anti-Legionella automatic thermal sanitisation cycle.
The enamelled steel tank features Titanshield anti-corrosion enamel technology combined with a replaceable sacrificial magnesium anode. The anode is accessible via a dedicated flange without draining the cylinder, keeping servicing quick and straightforward.
A hot-gas defrost valve prevents condenser freeze-up, allowing continuous heat pump operation down to −10 °C ambient. 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.
Compatible with Ariston BusBridgeNet — 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.
Supplied complete with a G3-compliant unvented safety kit — 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.
Air inlet and exhaust connections accept 150, 160, or 200 mm duct (PVC or PEHD) with up to 189 Pa available static pressure for long duct runs. Can also operate without ducting in rooms of at least 20 m³ — a significantly lower threshold than the previous 30 m³ generation requirement.
The sealed R290 refrigerant circuit is factory-charged and does not require field handling of refrigerant gas — so no F-Gas handling certification 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.
Technical Specifications — Nuos Plus S2 Wi-Fi 200D
| GENERAL | |
| MPN / Product Code | 4057138 |
| Model | Nuos Plus S2 Wi-Fi 200D + Unvented Kit |
| Tank Configuration | Direct (no secondary coil) |
| Rated Tank Capacity | 200 litres |
| ErP Energy Class (DHW) | A+ (tapping profile L) |
| Annual Electricity Consumption (average climate) | 781 kWh/year |
| Weight (empty) | 90 kg |
| Dimensions (H x W x D) | 1671 x 635 x 653 mm |
| Insulation Thickness | approx 50 mm polyurethane (CFC/HCFC-free) |
| Internal Tank Protection | Titanshield enamel + sacrificial magnesium anode |
| Max Operating Pressure | 0.6 MPa (6 bar) |
| Hydraulic Connections | 3/4" BSP — cold inlet / hot outlet |
| HEAT PUMP | |
| Refrigerant | R290 (propane) — GWP = 3 |
| Refrigerant Charge | 0.15 kg |
| COP at 7 C air / 10 C inlet / 55 C set (EN 16147) | 3.16 |
| Heating Time (EN 16147, 7 C air) | 8 hr 08 min |
| Max Electrical Power (heat pump) | 600 W |
| Max Water Temperature (heat pump mode) | 65 C |
| Ambient Operating Range | -10 C to +42 C |
| Mixed Water at 40 C (V40, EN 812/2013) | 278 litres |
| Standing Losses (Pes) | 24 W |
| AIR CIRCUIT | |
| Standard Air Flow Rate | 380 m3/h (auto modulating) |
| Available Static Pressure | 189 Pa |
| Duct Diameters Accepted | 150 mm / 160 mm / 200 mm |
| Minimum Room Volume (unducted) | 20 m3 |
| Indoor Sound Power Level | 48 dB(A) (EN 12102-2, ducted Ø200) |
| ELECTRICAL AND BACKUP ELEMENT | |
| Power Supply | 220-240 V ~ 50 Hz, single phase |
| Max Total Power Consumption | 2400 W |
| Backup Heating Element | 1800 W steatite immersion |
| Max Water Temperature (element mode) | 65 C (factory set) |
| Max Current Consumption | 10.5 A |
| Protection Rating | IPX4 |
Frequently Asked Questions
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Ariston Nuos Plus S2 Wi-Fi 200L Heat Pump Water Heater + Unvented Kit
The Ariston Nuos Plus S2 Wi-Fi 200D is a next-generation floor-standing air source heat pump water heater using the natural refrigerant R290 (propane) — with a global warming potential of just 3 — to deliver reliable domestic hot water at up to 80% lower running cost than a conventional electric immersion cylinder. Supplied complete with an unvented safety kit, this 200-litre direct model earns an ErP A+ energy rating (tapping profile L) and achieves a COP of 3.16 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.
Key Features
Uses R290 natural refrigerant 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 future-proofed against F-Gas regulation changes.
Achieves ErP A+ (tapping profile L) and an annual electricity consumption of just 781 kWh under average UK climate conditions — delivering over 80% energy savings compared with a conventional electric storage water heater of the same capacity.
Integrated Wi-Fi gateway connects to the Ariston Net smartphone app (iOS & Android) straight from the box — no separate dongle required. Monitor and adjust temperature, create heating schedules, track energy use, and receive alerts remotely. Optional voice control is supported.
Dedicated SG1/SG2 Smart Grid signal inputs 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.
Operates at just 48 dB(A) — quieter than the previous Nuos generation and comparable to a quiet office environment. An optional Night function reduces fan speed further for overnight operation, making it suitable for utility rooms near living or sleeping spaces.
Offers Green (heat pump only), Green+, Boost (heat pump + element simultaneously for fastest recovery), Comfort, i-Memory (learns four weeks of household hot water habits), weekly programme schedules, and an Anti-Legionella automatic thermal sanitisation cycle.
The enamelled steel tank features Titanshield anti-corrosion enamel technology combined with a replaceable sacrificial magnesium anode. The anode is accessible via a dedicated flange without draining the cylinder, keeping servicing quick and straightforward.
A hot-gas defrost valve prevents condenser freeze-up, allowing continuous heat pump operation down to −10 °C ambient. 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.
Compatible with Ariston BusBridgeNet — 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.
Supplied complete with a G3-compliant unvented safety kit — 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.
Air inlet and exhaust connections accept 150, 160, or 200 mm duct (PVC or PEHD) with up to 189 Pa available static pressure for long duct runs. Can also operate without ducting in rooms of at least 20 m³ — a significantly lower threshold than the previous 30 m³ generation requirement.
The sealed R290 refrigerant circuit is factory-charged and does not require field handling of refrigerant gas — so no F-Gas handling certification 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.
Technical Specifications — Nuos Plus S2 Wi-Fi 200D
| GENERAL | |
| MPN / Product Code | 4057138 |
| Model | Nuos Plus S2 Wi-Fi 200D + Unvented Kit |
| Tank Configuration | Direct (no secondary coil) |
| Rated Tank Capacity | 200 litres |
| ErP Energy Class (DHW) | A+ (tapping profile L) |
| Annual Electricity Consumption (average climate) | 781 kWh/year |
| Weight (empty) | 90 kg |
| Dimensions (H x W x D) | 1671 x 635 x 653 mm |
| Insulation Thickness | approx 50 mm polyurethane (CFC/HCFC-free) |
| Internal Tank Protection | Titanshield enamel + sacrificial magnesium anode |
| Max Operating Pressure | 0.6 MPa (6 bar) |
| Hydraulic Connections | 3/4" BSP — cold inlet / hot outlet |
| HEAT PUMP | |
| Refrigerant | R290 (propane) — GWP = 3 |
| Refrigerant Charge | 0.15 kg |
| COP at 7 C air / 10 C inlet / 55 C set (EN 16147) | 3.16 |
| Heating Time (EN 16147, 7 C air) | 8 hr 08 min |
| Max Electrical Power (heat pump) | 600 W |
| Max Water Temperature (heat pump mode) | 65 C |
| Ambient Operating Range | -10 C to +42 C |
| Mixed Water at 40 C (V40, EN 812/2013) | 278 litres |
| Standing Losses (Pes) | 24 W |
| AIR CIRCUIT | |
| Standard Air Flow Rate | 380 m3/h (auto modulating) |
| Available Static Pressure | 189 Pa |
| Duct Diameters Accepted | 150 mm / 160 mm / 200 mm |
| Minimum Room Volume (unducted) | 20 m3 |
| Indoor Sound Power Level | 48 dB(A) (EN 12102-2, ducted Ø200) |
| ELECTRICAL AND BACKUP ELEMENT | |
| Power Supply | 220-240 V ~ 50 Hz, single phase |
| Max Total Power Consumption | 2400 W |
| Backup Heating Element | 1800 W steatite immersion |
| Max Water Temperature (element mode) | 65 C (factory set) |
| Max Current Consumption | 10.5 A |
| Protection Rating | IPX4 |
Frequently Asked Questions
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Ariston Nuos Plus S2 Wi-Fi 200D is a next-generation floor-standing air source heat pump water heater using the natural refrigerant R290 (propane) — with a global warming potential of just 3 — to deliver reliable domestic hot water at up to 80% lower running cost than a conventional electric immersion cylinder. Supplied complete with an unvented safety kit, this 200-litre direct model earns an ErP A+ energy rating (tapping profile L) and achieves a COP of 3.16 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.
Key Features
Uses R290 natural refrigerant 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 future-proofed against F-Gas regulation changes.
Achieves ErP A+ (tapping profile L) and an annual electricity consumption of just 781 kWh under average UK climate conditions — delivering over 80% energy savings compared with a conventional electric storage water heater of the same capacity.
Integrated Wi-Fi gateway connects to the Ariston Net smartphone app (iOS & Android) straight from the box — no separate dongle required. Monitor and adjust temperature, create heating schedules, track energy use, and receive alerts remotely. Optional voice control is supported.
Dedicated SG1/SG2 Smart Grid signal inputs 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.
Operates at just 48 dB(A) — quieter than the previous Nuos generation and comparable to a quiet office environment. An optional Night function reduces fan speed further for overnight operation, making it suitable for utility rooms near living or sleeping spaces.
Offers Green (heat pump only), Green+, Boost (heat pump + element simultaneously for fastest recovery), Comfort, i-Memory (learns four weeks of household hot water habits), weekly programme schedules, and an Anti-Legionella automatic thermal sanitisation cycle.
The enamelled steel tank features Titanshield anti-corrosion enamel technology combined with a replaceable sacrificial magnesium anode. The anode is accessible via a dedicated flange without draining the cylinder, keeping servicing quick and straightforward.
A hot-gas defrost valve prevents condenser freeze-up, allowing continuous heat pump operation down to −10 °C ambient. 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.
Compatible with Ariston BusBridgeNet — 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.
Supplied complete with a G3-compliant unvented safety kit — 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.
Air inlet and exhaust connections accept 150, 160, or 200 mm duct (PVC or PEHD) with up to 189 Pa available static pressure for long duct runs. Can also operate without ducting in rooms of at least 20 m³ — a significantly lower threshold than the previous 30 m³ generation requirement.
The sealed R290 refrigerant circuit is factory-charged and does not require field handling of refrigerant gas — so no F-Gas handling certification 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.
Technical Specifications — Nuos Plus S2 Wi-Fi 200D
| GENERAL | |
| MPN / Product Code | 4057138 |
| Model | Nuos Plus S2 Wi-Fi 200D + Unvented Kit |
| Tank Configuration | Direct (no secondary coil) |
| Rated Tank Capacity | 200 litres |
| ErP Energy Class (DHW) | A+ (tapping profile L) |
| Annual Electricity Consumption (average climate) | 781 kWh/year |
| Weight (empty) | 90 kg |
| Dimensions (H x W x D) | 1671 x 635 x 653 mm |
| Insulation Thickness | approx 50 mm polyurethane (CFC/HCFC-free) |
| Internal Tank Protection | Titanshield enamel + sacrificial magnesium anode |
| Max Operating Pressure | 0.6 MPa (6 bar) |
| Hydraulic Connections | 3/4" BSP — cold inlet / hot outlet |
| HEAT PUMP | |
| Refrigerant | R290 (propane) — GWP = 3 |
| Refrigerant Charge | 0.15 kg |
| COP at 7 C air / 10 C inlet / 55 C set (EN 16147) | 3.16 |
| Heating Time (EN 16147, 7 C air) | 8 hr 08 min |
| Max Electrical Power (heat pump) | 600 W |
| Max Water Temperature (heat pump mode) | 65 C |
| Ambient Operating Range | -10 C to +42 C |
| Mixed Water at 40 C (V40, EN 812/2013) | 278 litres |
| Standing Losses (Pes) | 24 W |
| AIR CIRCUIT | |
| Standard Air Flow Rate | 380 m3/h (auto modulating) |
| Available Static Pressure | 189 Pa |
| Duct Diameters Accepted | 150 mm / 160 mm / 200 mm |
| Minimum Room Volume (unducted) | 20 m3 |
| Indoor Sound Power Level | 48 dB(A) (EN 12102-2, ducted Ø200) |
| ELECTRICAL AND BACKUP ELEMENT | |
| Power Supply | 220-240 V ~ 50 Hz, single phase |
| Max Total Power Consumption | 2400 W |
| Backup Heating Element | 1800 W steatite immersion |
| Max Water Temperature (element mode) | 65 C (factory set) |
| Max Current Consumption | 10.5 A |
| Protection Rating | IPX4 |
