Tesy V30065F41P4 – Buffer Tank (300 L)

High-efficiency buffer tank for stable and reliable heating systems

The Tesy V30065F41P4 is a robust and efficient 300-liter buffer tank designed for closed heating installations. With excellent insulation, a compact footprint and long-lasting construction, it is ideal for heat pump systems, boiler installations and hybrid configurations where thermal stability and system efficiency are essential.

Why every heat pump benefits from a buffer tank

Heat pumps achieve their highest efficiency when allowed to run with long, stable operating cycles. Without a buffer tank, the heat pump may switch on and off frequently, causing unnecessary wear and tear, unstable flow temperatures and a significant reduction in efficiency. By adding a buffer tank, the system gains a thermal reserve that:

• reduces short cycling,
• provides a stable flow temperature,
• improves hydraulic balancing across all heating circuits,
• extends the lifetime of the heat pump.

This results in improved comfort for the user and a more reliable, efficient heating system overall.

Energy-saving PU insulation for minimal heat losses

The V30065F41P4 is equipped with 50 mm PU foam insulation, ensuring low heat losses and excellent energy performance. With a standby loss of just 68 W (ΔT 45K), this buffer tank belongs to the more efficient options in the 300-liter range. The insulation maintains stable water temperatures and helps reduce the operating hours of the heat source.

Installer-friendly design with four sensor pockets

This buffer tank is engineered with practicality in mind. It includes four integrated sensor pockets, allowing installers to place control, thermostat and heat pump sensors at optimal locations. This feature is especially important for advanced control systems where temperature accuracy directly impacts system efficiency.

The relatively small 650 mm diameter makes the tank easy to manoeuvre through doorways and ideal for installation in compact technical rooms.

Compatible with multiple heating technologies

The Tesy buffer tank can be integrated into a wide variety of heating systems, such as:

• Heatpumps – to stabilize flow temperatures and reduce cycling,
• Buffer tanks as part of multi-stage systems,
• gas, oil or biomass boiler systems,
• hybrid systems combining heat pumps with solar thermal energy.

It is suitable for both underfloor heating and radiator circuits and supports hydraulic decoupling, improving the performance of pumps, mixing valves and distribution manifolds.

Ideal for residential and light commercial installations

The 300-liter capacity makes this model ideal for:

• single-family homes using heat pumps or boilers,
• systems with variable daily heat demand,
• installations with multiple heating zones,
• renovation projects where hydraulic stability is required.

The durable construction ensures long-term performance even under demanding operating conditions, making this buffer tank suitable for both new and retrofit systems.

Advantages for installers

Professionals benefit from:

• quick and straightforward installation,
• a clear and logical connection layout,
• four accessible sensor wells,
• a long-lasting, low-maintenance design.

In combination with components such as connection materials and heatpumps, installers can build efficient and future-proof heating systems tailored to any residential or small commercial application.

Professional guidance from Hewa

Hewa provides technical support, system optimisation advice and product selection guidance for installers and end users. If you would like to discuss how this buffer tank fits into your heating system, reach out for expert assistance or a tailored quotation.