Vaillant uniSTOR plus VIH RW 300/3 BR Hot Water Cylinder for Heat Pumps, 300 L, Energy Class B

The Vaillant uniSTOR plus VIH RW 300/3 BR is a high-quality, floor-standing hot water cylinder specifically designed for use with heat pumps and condensing boilers. With a nominal capacity of 300 litres and energy efficiency class B, this enamelled steel tank ensures reliable hot water supply while minimising standby heat loss. The cylinder features a large heat exchanger surface area of 3.0 m², enabling a continuous output of 40 kW at 80/60/45°C. Its robust construction includes high-quality PU rigid foam insulation and a magnesium anode for corrosion protection, guaranteeing long-lasting performance.

Advantages

Optimised for heat pump systems, the uniSTOR plus offers excellent energy efficiency and low standby heat loss of only 1.4 kWh/24h. The floor-standing design allows for easy installation in utility rooms or basements. The enamelled steel interior ensures durability and hygiene, while the integrated magnesium anode provides effective corrosion protection. The cylinder heats up quickly: from 10°C to 60°C in approximately 22 minutes (with 80/60°C primary flow).

Suitable for

• Heat pump systems (air/water, brine/water)
• Condensing boilers
• New builds and retrofit projects
• Domestic hot water supply for medium to large households

Key specifications

• Nominal capacity: 300 L
• Energy efficiency class: B
• Standby heat loss: 1.4 kWh/24h
• Max. operating pressure (water/heating): 10 bar / 10 bar
• Max. operating temperature (water/heating): 85 °C / 110 °C
• Heat exchanger surface area: 3.0 m²
• Continuous output (80/60/45°C): 40 kW
• Heating-up time (10°C to 60°C): approx. 22 min
• Tank material: Steel, enamelled
• Corrosion protection: Magnesium anode
• Insulation: High-quality PU rigid foam
• Connections: Cold/hot water R 1", heating flow/return R 1", circulation R 3/4", sensor/thermometer R 1/2"
• Installation: Floor standing

Recommendations

For optimal performance, pair the uniSTOR plus with a compatible Vaillant heat pump or condensing boiler. Regular inspection of the magnesium anode is recommended to ensure long service life. Professional installation by a qualified technician is advised.