Solar DHW CylinderauroSTEP plus VIH S2 150-350l

Solar cylinder for cost-efficient hot water preparation.

Energy-saving domestic hot water generation
Sustainable solar station with drain-back technology
Three storage tank sizes to suit every household
Compatible with boilers and electric backup
High-efficiency pump with automatic flow control
Space-saving solar module with built-in components

The auroSTEP plus domestic hot water solar cylinder provides an ultra‑convenient hot water supply for up to seven people. By using solar energy you can reduce water heating costs by 60% or more. The auroSTEP plus requires minimal space, as the solar controller and drain‑back station are integrated into a single module mounted on the storage tank. The solar controller ensures efficient operation of the solar system and offers numerous comfort and protection functions, including Legionella prevention and overheating protection. When sunlight is insufficient, the auroSTEP plus allows you to connect and operate backup systems for water heating, ensuring a reliable supply for your home all times.

Ideal for:

Hot water

Technical data table overline

Technical data table headline

auroSTEP plus
VIH S2 250/4 B	VIH S2 350/4 B

ErP

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

auroSTEP plus
VIH S2 250/4 B	VIH S2 350/4 B

Cylinder

Cylinder Nominal Capacity	Cylinder Nominal Capacity	246 l	330 l
Cylinder Part Capacity, Standby Content	Cylinder Part Capacity, Standby Content	117 l	138 l
Cylinder Part Capacity, Solar	Cylinder Part Capacity, Solar	129 l	192 l

Heat Exchanger

Heat Exchanger Solar (Heating Area / Heat Exchanger Content)	Heat Exchanger Solar (Heating Area / Heat Exchanger Content)	1,3 m² / 8,9 l	1,6 m² / 10 l
Heat Exchanger Heating (Heating Area / Heat Exchanger Content)	Heat Exchanger Heating (Heating Area / Heat Exchanger Content)	0,8 m² / 5 l	0,7 m² / 5 l

Domestic Hot Water

Initial Domestic Hot Water Output (flow = 45 °C)	Initial Domestic Hot Water Output (flow = 45 °C)	155 l/10min	203 l/10min
NL-Figure	NL-Figure	1,2	2,2

Insulation And Heat Loss

Standby Heat Loss	Standby Heat Loss	1,56 kWh/24h	1,7 kWh/24h

Connections

Connection Dimension Heating (Flow, Return)	Connection Dimension Heating (Flow, Return)	R 1″	R 1″
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	1.596 mm / 600 mm / 600 mm	1.778 mm / 690 mm / 690 mm
Weight	Weight	123 kg	163 kg
Weight Ready for Operation	Weight Ready for Operation	384 kg	512 kg
Tilt Dimension	Tilt Dimension	1.650 mm	1.835 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)	3 bar	3 bar
Operating Pressure Solar (max)	Operating Pressure Solar (max)	6 bar	6 bar
Temperature Domestic Hot Water (max)	Temperature Domestic Hot Water (max)	85 °C	85 °C
Temperature Solar (max)	Temperature Solar (max)	130 °C	130 °C
Temperature Heating (max)	Temperature Heating (max)	90 °C	90 °C