QUADROFLEX QFS 1 300 Solar Storage Tank

Product detailed description

Solar storage tanks are essential components in solar thermal systems for domestic hot water and space heating applications. The QUADROFLEX QFS 1 300 model is commonly used in residential and small commercial buildings where solar energy is the primary or supplementary heating source. Installers working with this system typically deal with closed-loop solar circuits, ensuring proper integration with collectors and control systems. This tank supports single-loop configurations, meaning it can be connected to only one external heat source — in this case, a solar thermal array. Additional heating can be achieved via optional electric elements, making it suitable for hybrid systems requiring backup heating during low solar yield periods.

The tank is constructed with a steel body coated with enamel for corrosion resistance and is insulated with polyurethane without CFC. It includes an anode for internal protection against corrosion and a cleaning port for periodic maintenance. The design allows for connection to circulation loops and supports integration with control systems that manage solar input and auxiliary heating. The maximum operating pressure is 0.8 MPa, and the tank is rated for temperatures up to 95°C, making it suitable for a wide range of solar thermal applications.

Technical parameters

Actual volume	300 L
Volume of top heat exchanger	8.8 L
Surface area of top heat exchanger	1.45 m²
Thermal power of top heat exchanger	53 kW
Constant hot water flow at dT 35°C (60-80°C) S1	1248 L/h
Energy efficiency class ERP	B
Height	1420 mm
Diameter	650 mm
Warranty	2 years
Net weight	92 kg
EAN	3800879302697
Code	301394
Brand	QUADROFLEX

The parameters provided are critical for proper system sizing and component selection. The actual volume of 300 L defines the storage capacity for domestic hot water. The heat exchanger has a surface area of 1.45 m² and a thermal power rating of 53 kW, which helps determine the rate of heat transfer from the solar circuit to the stored water. The maximum flow rate of 1248 L/h at a temperature difference of 35°C indicates the tank's ability to deliver heated water under typical operating conditions. These values assist in matching the tank to the size and performance of the solar collector array.

Installation and connection

Installation of the QUADROFLEX QFS 1 300 requires careful planning to ensure compatibility with the existing solar thermal system. The tank should be mounted vertically in a location with sufficient clearance for maintenance access and airflow. Connections are made using standard pipe sizes and thread types appropriate for the system’s pressure and temperature ratings. The heat exchanger is connected to the solar circuit, while the domestic hot water supply is connected to the upper part of the tank.

Installers must verify the correct orientation of the tank and ensure that all valves and safety devices are properly positioned. A pressure relief valve is required and should be connected according to local regulations. Common installation errors include incorrect positioning of the heat exchanger or failure to secure the tank adequately to the mounting frame. It is also important to ensure that the insulation remains intact during installation to maintain thermal efficiency.

Compatibility and accessories

The QUADROFLEX QFS 1 300 is compatible with solar thermal systems designed for single-loop operation. It supports the installation of up to two electric heating elements with a total power of 12 kW, allowing for hybrid operation when solar input is insufficient. Accessories such as a pressure relief valve, circulation pump and control system must be ordered separately and installed according to the manufacturer’s guidelines. The tank is not compatible with multi-source heating systems unless additional components are added to manage multiple inputs.

Technical background for designers

The operating principle of the QUADROFLEX QFS 1 300 relies on indirect heat transfer through a built-in heat exchanger. Solar-heated fluid circulates through the heat exchanger coil inside the tank, transferring thermal energy to the stored water. The enamel-coated steel construction provides durability and resistance to corrosion, while the polyurethane insulation minimizes heat loss. The tank’s performance is influenced by the efficiency of the heat exchanger, the quality of the insulation and the accuracy of the control system managing the solar circuit.

Designers should consider the tank’s maximum operating pressure and temperature limits when integrating it into the system. The tank’s single-loop configuration means it cannot be directly connected to multiple heat sources without additional controls. The inclusion of an anode helps extend the tank’s service life by preventing internal corrosion. Regular maintenance of the heat exchanger and cleaning of the tank interior are important for long-term performance.

Service and operation

Periodic maintenance is recommended to ensure continued performance of the QUADROFLEX QFS 1 300. The cleaning port allows for inspection and removal of sediment buildup in the lower part of the tank. The anode should be checked and replaced if necessary, depending on water quality and usage patterns. The pressure relief valve should be tested annually to confirm proper function. No specific service intervals are provided in the brief, but routine checks are advised to prevent system failures and extend the tank’s operational life.

Frequently asked questions

Can the QUADROFLEX QFS 1 300 be connected to a second heat source?
It can support up to two electric heating elements but cannot be directly connected to a second thermal source such as a boiler or heat pump without additional controls.

Is the tank suitable for use with a circulation loop?
Yes, the tank supports connection to a circulation loop for improved heat distribution and prevention of stratification in the stored water.

What is the maximum allowable operating pressure?
The tank is rated for a maximum operating pressure of 0.8 MPa and a heat exchanger pressure of 6 bar.

How is the tank protected against corrosion?
It features an enamel-coated steel interior and an anode for internal corrosion protection. A pressure relief valve is also included as part of the safety system.

Documents for download

• Dokument na stiahnutie (PDF)