Tesy EV12S17S50075 - Indirect Hot Water Cylinder with Dual Heat Exchangers (500 L)

High-capacity hot water production for modern heating systems

The Tesy EV12S17S50075 is a powerful 500-liter indirect hot water cylinder equipped with two large, high-output heat exchangers. Designed for systems that combine multiple heat sources—such as heat pumps, solar thermal collectors or a traditional boiler for peak demand—it delivers exceptional efficiency and reliable hot water production. The datasheet confirms the generous coil surfaces of 1.8 m² and 1.95 m², making this model ideal for high-performance installations.

Dual coils for superior system flexibility

The two heat exchangers allow installers to integrate different heat sources within the same system, enabling a wide range of hydraulic configurations, including:

• Heat pump + solar thermal
• Solar + gas/oil boiler backup
• Heat pump + electric immersion heater (optional)

The cylinder delivers excellent hot water performance, achieving 691–715 liters ≥ 40 °C per coil, and up to 724 liters when both coils are combined, according to the datasheet. This makes it ideal for larger homes, guesthouses, multi-bathroom dwellings and commercial applications.

Outstanding energy efficiency and low heat losses

The 500 L model features 50 mm polyurethane insulation, ensuring minimal standby losses of only 95 W (ΔT 45K). Given its size, this is a remarkably efficient result that helps reduce operating costs and boosts system performance. The unit is classified as Energy Class C, placing it among the more efficient tanks in its volume category.

CrystalTech PRO enamel for long-term durability

The internal tank surface is coated with CrystalTech PRO enamel, described in the Tesy product documentation as a highly durable and corrosion-resistant protective layer. Combined with the two integrated magnesium anodes, it ensures excellent longevity even in areas with challenging water conditions or high mineral content.

Installer-friendly design with practical service features

Professionals will appreciate the thoughtful construction of the EV12S17S50075. Key installation and service advantages include:

• A large service opening for easy cleaning and inspection
• An integrated recirculation connection for instant hot water delivery
• Clear, standardized hydraulic connections (G1")
• Compatibility with electric immersion heaters
• Robust construction suitable for high-demand environments

The cylinder is therefore easy to integrate into existing or new systems, especially when combined with Hewa’s range of heat pumps, solar boiler systems and installation materials.

Ideal for high-demand domestic and commercial installations

With its large capacity and excellent recovery rate, the EV12S17S50075 is well suited for:

• Homes with multiple bathrooms or simultaneous usage
• Domestic hot water recirculation systems
• High-output solar thermal installations
• Heat pump systems with elevated DHW priorities
• Small commercial environments such as gyms, guesthouses or kitchens

Tesy – proven engineering and reliable performance

Tesy cylinders are known for their build quality, strong enamel-coated steel, excellent insulation and dependable long-term operation. The EV12S17S50075 continues this tradition, offering engineers and installers a robust, high-efficiency solution for projects where reliability and capacity are critical.

Technical support & system design by Hewa

Hewa provides installers with expert system advice, dimensioning assistance and ready-to-deploy hydraulic concepts. Whether you plan to integrate the cylinder into a heat pump system, a solar-assisted setup or a hybrid configuration, our team is happy to support you. Contact us for specifications, stock availability or a tailored quotation.