QUADROFLEX QFDS 1 300 Heat Pump Storage Tank

Product detailed description

This storage tank is commonly integrated into heat pump systems in residential, commercial and light industrial buildings. It supports both domestic hot water (DHW) and space heating circuits, acting as a buffer and thermal accumulator. Installers typically work with systems where precise sizing and hydraulic balance are essential for maintaining system efficiency. The unit is intended for use with low-temperature heat sources and is suitable for closed-loop heating systems.

In installations, the tank is positioned between the heat pump and the distribution system (radiators, underfloor heating, DHW circuits). The high-surface-area heat exchanger ensures rapid heat transfer, reducing cycling of the heat pump and improving overall system stability. Proper insulation and positioning are critical to avoid thermal losses and ensure efficient operation.

Technical parameters

Real volume	300 L
Constant DHW flow rate at ΔT 35°C (60-80°C) S1	1932 L/h
V40	302 L
Energy rating class ERP	B
Height	1420 mm
Width	650 mm
Warranty	2 years
Net weight	102 kg
EAN	3800879302963
Code	301397
Brand	QUADROFLEX

The real volume of 300L indicates the usable capacity for storing heated water. The constant flow rate of 1932 L/h at a temperature differential of 35°C reflects the tank’s ability to supply DHW efficiently. The V40 value of 302L refers to the volume of water at 40°C after heat exchange, which helps determine the sizing for DHW demand. The energy rating class B means the tank meets higher efficiency standards for DHW preparation compared to lower-rated models.

Installation and connection

Installers should begin by selecting a location near the heat pump and circulation pumps to minimize piping losses. The tank should be mounted vertically with sufficient clearance for inspection and access to connections. All connections must be verified for correct orientation and sealing before commissioning.

• Connect the heat pump circuit to the primary side of the heat exchanger using appropriate pipe sizes and fittings.
• Ensure the secondary side (DHW or space heating) is connected with the required flow rates and pressure drops considered.
• Mount expansion vessels and safety valves according to local regulations and manufacturer guidelines.
• Verify all electrical connections are grounded and insulated correctly.

Common installation errors include incorrect orientation of the heat exchanger, undersized piping leading to restricted flow, and failure to insulate exposed surfaces. These can lead to reduced efficiency and premature component wear.

Compatibility and accessories

The QFDS 1 300 is compatible with most modern heat pump systems that operate within standard DHW and heating circuit parameters. For complete system integration, additional components such as circulation pumps, expansion vessels and safety valves may need to be sourced separately. Always refer to the heat pump manufacturer's recommendations for matching system components.

Technical background for designers

The tank operates via indirect heat transfer through a built-in heat exchanger. The large surface area allows for more effective heat transfer than conventional systems, ensuring stable operation even during partial load conditions. The tank is constructed with durable materials suitable for long-term exposure to heated water and system pressures.

The design accommodates both continuous and intermittent heat input from the heat pump. Efficient heat retention is achieved through insulation and the use of high-density materials. The integration into a system requires careful balancing of flow rates and temperatures to avoid overloading the heat pump or reducing DHW availability.

Service and operation

Maintenance includes regular checks of the heat exchanger for scaling and corrosion, especially in areas with hard water. The tank is covered by a 2-year warranty, so any defects in manufacturing or material should be reported promptly. No specific service intervals are provided in the brief, but annual inspections are recommended for optimal performance.

Frequently asked questions

Can the QUADROFLEX QFDS 1 300 be connected to a solar thermal system?
It can be integrated into hybrid systems if the solar circuit is properly balanced with the heat pump and DHW requirements.

What is the recommended minimum distance between the tank and the heat pump unit?
There is no specific distance stated in the brief, but a close proximity is advised to reduce thermal losses and piping complexity.

Does the tank require an external expansion vessel for DHW circuits?
Yes, depending on the system configuration, an expansion vessel should be installed to accommodate pressure changes during operation.

Is the tank suitable for use with underfloor heating systems?
Yes, the tank is compatible with underfloor heating when the system is designed with appropriate flow and return temperatures.

Documents for download

• Dokument na stiahnutie (PDF)