Integrated Heat Pump R290 · GWP 3 200 Litres CoP >3.19 Energy Rating A+ Stainless Steel 1.2kW Titanium Heater G3 Kit Included
The Vaillant aroSTOR VWL B 200/5 UK is a compact, standalone domestic hot water heat pump cylinder from one of the UK's most trusted heating brands. Combining a 200-litre premium stainless steel cylinder with an integrated R290 air-source heat pump, it achieves an A+ ErP rating with a CoP exceeding 3.19 — delivering significant running cost savings versus direct electric water heating. The unit is fully self-contained, requiring no connection to a boiler or existing heating system. It draws ambient room air or external air via flexible or rigid ductwork. The 1.2 kW titanium backup immersion ensures continuous hot water supply even in very cold conditions, and a complete G3 unvented kit is included.
Recovery & Heat-Up Times
5–12 hrs
Full heat-up from cold to 55°C (HP only — varies with air temp)
>3.19
CoP (A7/W55, EN16147)
60°C
Max temp — heat pump only
65°C
Max temp — with backup heater
⏱️ Recovery Note: Vaillant's aroSTOR manual confirms that initial heat-up from cold takes 5 to 12 hours to reach 55°C, depending on ambient air temperature and inlet cold water temperature. At warmer air temperatures (e.g. +15°C) heat-up is towards the lower end; at −7°C conditions it approaches 12 hours. The aroSTOR is designed to trickle-heat overnight and maintain temperature during the day — it should remain energised at all times during normal occupancy.
Key Features
- Standalone integrated heat pump — no boiler, no solar, no additional heat source required; fully self-contained
- A+ ErP energy rating, 132% water heating efficiency — approximately 775 kWh/year annual consumption
- R290 (propane) refrigerant — GWP of 3, zero ODP, 0.15 kg factory charge; future-proof against F-Gas regulations
- CoP >3.19 (A7/W55) — over 3× energy output versus electricity consumed
- Premium 200L stainless steel cylinder — corrosion-resistant, 5-year manufacturer's warranty
- 1.2 kW titanium backup immersion heater — operates when HP output alone is insufficient, or in BOOST mode
- Heats to 60°C on heat pump alone — exceeds Legionella prevention threshold without element use
- Thermal losses 1.61 kWh/24h at 55°C — superior insulation minimises standing heat loss
- 50 dB(A) sound power — relatively quiet for airing cupboard or utility room placement
- Flexible air ducting up to 10m / rigid ducting up to 20m (≥160mm diameter) — flexible installation options
- Multiple operating modes: ECO (HP only), AUTO (HP + backup), BOOST, PROGRAMME, and HOLIDAY
- Photovoltaic (PV) mode via low-voltage signal cable — maximises self-consumption from solar PV
- Built-in anti-legionella cycle, anti-freeze protection, and condensate management
- Onboard rotary control with LCD display — simple interface with timer programming
- Hot Water Association (HWA) member product — full UK unvented compliance support
- Complete G3 kit included: potable expansion vessel, PRV, tundish, and integrated controls
R290 GWP=3 Stainless Steel Standalone 20m Rigid Duct PV Mode G3 Kit Included Titanium Heater
Technical Specifications
What's Included
aroSTOR 200L cylinder with integrated R290 heat pump
1.2 kW titanium backup immersion heater
G3 unvented kit (potable expansion vessel, PRV, check valve, tundish)
Onboard rotary controls with LCD display
Condensate discharge hose
UK installation and operating manual
ℹ️ Standalone Operation: Unlike many integrated HP cylinders that benefit from a boiler backup, the aroSTOR is designed to be entirely self-sufficient. It operates independently — ideal for all-electric properties, off-gas homes, or retrofits where adding boiler connectivity is impractical.
☀️ PV / Photovoltaic Mode: The aroSTOR includes a dedicated PV mode controlled via a low-voltage signal cable. When connected to a PV inverter or energy management system, the unit will prioritise heat pump and/or heater operation during solar surplus periods, maximising self-consumption.
⚠️ Installer Requirements: Must be installed by a G3-qualified person in compliance with Building Regulations Part G3. The R290 refrigerant circuit requires F-Gas certified engineers for any servicing. Duct installation must comply with Vaillant's installation manual specifications for duct length, insulation, and termination.
Frequently Asked Questions
How long does the aroSTOR take to heat from cold to 55°C?
According to Vaillant's manual, initial heat-up from cold water to 55°C takes between 5 and 12 hours on heat pump only, depending on ambient air temperature and inlet water temperature. At warmer conditions (e.g. +15°C air) heat-up is towards 5 hours; in cold winter conditions near −7°C it approaches 12 hours. The aroSTOR is designed to charge overnight and maintain temperature — it should remain energised throughout normal occupancy.
Does the aroSTOR need to connect to a boiler?
No. The VWL B 200/5 is a fully standalone unit. It requires only a mains electrical connection and air supply/exhaust ductwork. No boiler, solar, or secondary heat source is needed. This makes it ideal for all-electric and off-gas properties.
Is it suitable for Legionella prevention?
Yes. The heat pump alone can reach 60°C — above the 55°C storage temperature required for Legionella control. With the backup heater, it reaches 65°C. An automatic anti-legionella cycle can be programmed to run periodically.
What are the ductwork requirements?
The aroSTOR can draw ambient room air (with adequate room volume) or connect via ductwork to external air. Flexible duct can run up to 10m; rigid heat-insulated duct (minimum 160mm diameter) up to 20m. Both intake and exhaust ducts are required. The installation manual specifies insulation requirements and external termination details.
Does it come with a G3 kit?
Yes — the aroSTOR includes a complete G3 unvented kit: potable water expansion vessel, pressure reducing valve, check valve, and tundish. This reduces the additional components an installer needs to source and simplifies G3 Building Regulations compliance.
What warranty does Vaillant provide?
Vaillant provides a full parts and labour guarantee for the duration shown on the enclosed registration card, which must be completed and returned within 30 days of installation. The stainless steel cylinder carries a 5-year warranty. Installation must be by a suitably qualified person complying with all applicable regulations.
