Tesy V11S50075HYG5.0C - Hygienic Cylinder with 1 Heat Exchanger & Stainless Steel Coil (500 L)

High-performance hygienic hot water generation combined with modern heating systems

The Tesy V11S50075HYG5.0C is a versatile 500-liter hygienic buffer tank designed for installations where space heating and instantaneous, legionella-safe domestic hot water (DHW) production are required. Thanks to the combination of a powerful stainless-steel hygienic coil and an integrated heat exchanger, this model is ideal for heat pump systems, solar thermal installations and hybrid configurations. The datasheet confirms that the hygienic coil provides an impressive 5 m² heat exchange area and 26 liters of internal volume, ensuring rapid and consistent DHW delivery.

Hygienic stainless-steel coil – safe domestic hot water

Unlike traditional DHW cylinders, a hygienic tank does not store potable hot water inside the vessel. Instead, cold water flows through the AISI 316L stainless-steel coil, where it is instantly heated by the surrounding buffer water. This ensures:

• No stagnation zones → legionella-safe DHW
• Continuous high-flow DHW production
• Reduced scaling thanks to stainless-steel construction
• Excellent corrosion resistance in all water conditions

Integrated heat exchanger for energy-efficient system integration

The unit includes a 1.65 m² heat exchanger for connecting to a heat source such as:

• heat pumps (ideal due to large buffer volume)
• Solar boiler systems (high temperature potential)
• Gas or biomass boilers

The DHW coil is engineered for high output and is rated at 10 bar, allowing the tank to support strong flow rates even with varying mains water pressures.

Energy efficiency and low heat losses

The cylinder features 50 mm polyurethane foam insulation, achieving a standby loss of only 95 W at ΔT 45K, as stated in the datasheet For a 500 L tank, this represents an excellent result and contributes to reduced energy consumption throughout the year.

Installer-focused design

The V11S50075HYG5.0C includes several features that simplify installation and maintenance:

• 4 hydraulic connections for heating sources and returns
• 4 sensor pockets for precise system control
• A large service opening for maintenance
• Compact footprint with a 750 mm diameter
• Installation height requirement of 182.5 cm (unit height 167.7 cm)

Perfect fit for hybrid and renewable systems

This hygienic buffer tank is an excellent match for modern heating concepts, including:

• Heat pump systems requiring buffer stabilization
• Solar thermal installations delivering high temperatures
• Hybrid boiler + heat pump setups
• Systems with high domestic hot water demands

By pairing this tank with Hewa system components—such as heat pumps, buffer tanks and installation materials—installers can create efficient, future-proof energy systems.

Applications

The Tesy hygienic tank is suitable for buildings with increased comfort needs, including:

• Large residential houses with multiple bathrooms
• Properties with rainfall showers or high draw-off rates
• Commercial environments such as offices or guesthouses
• Projects requiring legionella-safe DHW generation

Tesy quality and reliability

With durable construction, corrosion-resistant materials and precise engineering, Tesy hygienic tanks are designed for long service life and consistent performance. The V11S50075HYG5.0C continues this tradition with its robust coil system, strong insulation and generous buffer volume.

Professional support from Hewa

Hewa supports installers with system design, sizing recommendations and hydraulic schematics tailored to individual projects. Contact us for technical documentation, availability or a custom system configuration.