DHW CylinderuniSTOR plus VIH SW 400-500l

Large-capacity cylinders for long-lasting hot-water comfort with solar and heat pump systems.

High hot-water comfort for family houses
Perfect match for heat pump and solar systems
Effective heat retention for long-lasting performance
High quality made in Germany — built to last
Available in multiple sizes for 4 to 10 people
Clear and convenient temperature display

Our uniSTOR plus VIH SW hot-water cylinders provide both high comfort and efficiency when combined with heat pumps and solar systems. Their advanced design makes full use of free solar energy and the low operating costs of a heat pump when sunlight is limited. With a capacity of 400 L or 500 L, they are the ideal solution for single- and two-family homes, ensuring perfect domestic comfort even in cases of simultaneous hot-water use. Thanks to B-rated insulation technology (on a scale from A to F), heat loss remains remarkably low. Made from high-quality materials and protected against corrosion by a replaceable magnesium anode, the uniSTOR plus VIH SW stands out for its long-lasting reliability and consistent performance over many years.

Ideal for:

Hot water

Technical data table overline

Technical data table headline

uniSTOR plus
VIH SW 400/3 BR	VIH SW 500/3 BR

ErP

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

uniSTOR plus
VIH SW 400/3 BR	VIH SW 500/3 BR

Cylinder

Cylinder Nominal Capacity	Cylinder Nominal Capacity	372 l	456 l

Heat Exchanger

Heat Exchanger Solar (Heating Area / Heat Exchanger Content)	Heat Exchanger Solar (Heating Area / Heat Exchanger Content)	1,47 m² / 9,6 l	2,07 m² / 13,5 l
Heat Exchanger Heat Pump (Heating Area / Heat Exchanger Content)	Heat Exchanger Heat Pump (Heating Area / Heat Exchanger Content)	3,24 m² / 21,2 l	4,42 m² / 28,9 l

Domestic Hot Water

Initial Domestic Hot Water Output (Tcyl = 60 °C) (Draw-off Temperature 45 °C)	Initial Domestic Hot Water Output (Tcyl = 60 °C) (Draw-off Temperature 45 °C)	266 l/10min	330 l/10min
Continuous Domestic Hot Water Output (flow = 60 °C) (Draw-off Temperature 45 °C) / Heat Output	Continuous Domestic Hot Water Output (flow = 60 °C) (Draw-off Temperature 45 °C) / Heat Output	1.091 l/h / 44 kW	1.530 l/h / 62 kW
NL-Figure (Tcyl = 60 °C)	NL-Figure (Tcyl = 60 °C)	1,5	2,8

Insulation And Heat Loss

Standby Heat Loss	Standby Heat Loss	1,58 kWh/24h	1,85 kWh/24h

Connections

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

Dimensions

Height / Width / Depth	Height / Width / Depth	1.502 mm / 790 mm / 900 mm	1.802 mm / 790 mm / 900 mm
Weight	Weight	189 kg	249 kg
Weight Ready for Operation	Weight Ready for Operation	561 kg	703 kg
Tilt Dimension	Tilt Dimension	1.684 mm	1.954 mm

Limitations

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

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Operating Instructions

uniSTOR plus VIH SW 400-500l Operating InstructionVIH SW 400/3 BR, VIH SW 500/3 BRPDF (1.48 MB)