Tesy V50075F42P4 - Buffer tank (500L)

High-capacity buffer tank for efficient and stable heating systems

The Tesy V50075F42P4 is a durable and high-performance 500-liter buffer tank designed to stabilise, optimise and support closed heating systems. Whether used with heat pumps, boilers or hybrid heating configurations, this buffer tank provides the necessary thermal mass to ensure smoother operation, improved energy efficiency and enhanced comfort throughout the property.

Why choose a 500-liter buffer tank?

Systems with medium to high heating loads greatly benefit from a 500-liter water buffer. This storage capacity enables:

• significantly reduced heat pump cycling,
• smoother compressor operation and extended system lifespan,
• stable flow temperatures even under varying demand,
• improved hydraulic separation between primary and secondary circuits.

In hybrid systems — for example, combining a heat pump with a gas or biomass boiler — the buffer tank ensures seamless cooperation between heat sources by storing thermal energy and releasing it when required.

Energy-efficient insulation for low standby losses

The buffer tank features 50 mm thick PU insulation that minimises temperature losses and maintains stored heat for longer periods. With a standby heat loss of 95 W (ΔT 45 K), the V50075F42P4 performs strongly in its category. This results in reduced operational hours for the heat source and lower energy bills for the user.

Designed for professional installation

The buffer tank includes:

• four sensor pockets for accurate control and monitoring,
• multiple connection levels for flexible hydraulic layouts,
• a compact diameter of 750 mm for easy placement,
• a robust, low-maintenance steel body with long-term durability.

These features make installation straightforward, even in retrofit scenarios or tight technical rooms.

Compatible with various heating technologies

The Tesy V50075F42P4 integrates seamlessly into heating setups such as:

• Heat pumps — to stabilise flow temperatures and reduce start-stop cycles,
• solar thermal support systems,
• boiler-driven central heating circuits,
• multi-zone heating systems with mixers and distribution manifolds.

The high thermal mass improves the system’s response time and maintains balanced operation across all heating circuits.

Ideal for residential and light commercial applications

The 500-liter capacity makes this buffer tank suitable for:

• medium to large homes with heat pumps between 10–20 kW,
• properties with fluctuating heating demand,
• installations with multiple heating zones,
• hybrid heating solutions requiring extra thermal storage.

Its ability to stabilise system temperatures results in increased comfort and fewer operational fluctuations, especially during peak heating periods.

Benefits for installers

Installers will appreciate:

• fast installation due to the clear connection layout,
• ample sensor pockets for sophisticated control systems,
• a compact body that fits into constrained spaces,
• a reliable, low-maintenance design.

Combined with connection materials and heat pumps, the buffer tank becomes part of a high-performance, future-ready heating system.

Expert support from Hewa

Hewa provides complete system guidance, including hydraulic design, product selection and on-site configuration. For tailored advice, availability or integration support, contact us.