DHW Cylinder for Heat PumpuniSTOR plus VIH RW 300-500 l

Large-capacity cylinders ensuring durable hot-water comfort with heat pumps.

High hot-water comfort for family homes
Perfect combination with heat pumps
Excellent heat retention for lasting warmth
High quality made in Germany — built to last
Available in multiple sizes for 4 to 10 people
Clear temperature information

Our uniSTOR plus VIH RW hot-water cylinders provide high comfort and energy efficiency in combination with heat pumps. Their advanced technology allows full use of the heat pump’s low operating costs for heating domestic water. With a capacity range from 300 to 500 litres, they are the ideal solution for single- and two-family homes, ensuring perfect hot-water comfort even during simultaneous use. Thanks to B-rated insulation technology (A–F scale), heat loss remains remarkably low. Made from high-quality materials and protected against corrosion by a replaceable magnesium anode, the uniSTOR plus VIH RW stands out for its reliable performance and long-lasting durability.

Ideal for:

Hot water

Technical data table overline

Technical data table headline

uniSTOR plus
VIH RW 300/3 BR	VIH RW 400/3 BR	VIH RW 500/3 BR

ErP

ErP Energy Efficiency Class Hot Water Storage Tanks	ErP Energy Efficiency Class Hot Water Storage Tanks

uniSTOR plus
VIH RW 300/3 BR	VIH RW 400/3 BR	VIH RW 500/3 BR

Cylinder

Cylinder Nominal Capacity	Cylinder Nominal Capacity	281 l	375 l	460 l

Heat Exchanger

Heat Exchanger Heating (Heating Area / Heat Exchanger Content)	Heat Exchanger Heating (Heating Area / Heat Exchanger Content)	3,12 m² / 20,4 l	4,42 m² / 28,9 l	5,90 m² / 38,6 l

Domestic Hot Water

Initial Domestic Hot Water Output (flow = 45 °C) (Tcyl = 60 °C)	Initial Domestic Hot Water Output (flow = 45 °C) (Tcyl = 60 °C)	377 l/10min	504 l/10min	618 l/10min
Continuous Domestic Hot Water Output (flow = 45 °C) (Tcyl = 60 °C) / Heat Output	Continuous Domestic Hot Water Output (flow = 45 °C) (Tcyl = 60 °C) / Heat Output	1.063 l/h / 43 kW	1.531 l/h / 62 kW	2.041 l/h / 83 kW
NL-Figure (Tcyl = 60 °C)	NL-Figure (Tcyl = 60 °C)	3,8	6,1	8,9

Insulation And Heat Loss

Standby Heat Loss	Standby Heat Loss	1,40 kWh/24h	1,54 kWh/24h	1,84 kWh/24h

Connections

Connection Dimension Cold Water, Domestic Hot Water	Connection Dimension Cold Water, Domestic Hot Water	R ¾″	R ¾″	R ¾″
Connection Dimension Circulation	Connection Dimension Circulation	R ¾″	R ¾″	R ¾″
Connection Dimension Heating (Flow, Return)	Connection Dimension Heating (Flow, Return)	R 1″	R 1″	R 1″

Dimensions

Height / Width / Depth	Height / Width / Depth	1.804 mm / 650 mm / 755 mm	1.502 mm / 790 mm / 900 mm	1.802 mm / 790 mm / 900 mm
Weight	Weight	141 kg	181 kg	235 kg
Weight Ready for Operation	Weight Ready for Operation	422 kg	556 kg	694 kg
Tilt Dimension	Tilt Dimension	1.903 mm	1.684 mm	1.954 mm

Limitations

Operating Pressure Domestic Hot Water (max)	Operating Pressure Domestic Hot Water (max)	10 bar	10 bar	10 bar
Operating Pressure Heating (max)	Operating Pressure Heating (max)	10 bar	10 bar	10 bar
Temperature Domestic Hot Water (max)	Temperature Domestic Hot Water (max)	85 °C	85 °C	85 °C
Temperature Heating (max)	Temperature Heating (max)	110 °C	110 °C	110 °C