Heat exchanger KOSPEL SB-501 L with 2 coils (vertical) – model 10.5.02.005.02

KOSPEL SB-501 L with 2 coils (vertical) is a stainless-steel buffer and indirect water heater designed for separation of primary and secondary circuits. The cylinder includes two internal heat-exchange coils that allow simultaneous connection of two heat sources or staged heat transfer from one source to multiple consumer circuits. The vertical layout and internal coil arrangement make this heat exchanger suitable for domestic hot water systems, buffer storage and integration with boilers, solar thermal collectors or heat pumps.

Advantages

The dual-coil configuration permits independent connection of two heat sources, increasing installation flexibility and enabling prioritized or parallel heat supply. The vertical design reduces footprint and facilitates natural stratification for improved thermal layering. Constructed from corrosion-resistant materials and designed for indirect heating, the unit provides hygienic separation between heating medium and potable water. The internal coil geometry ensures efficient energy transfer and supports integration with various external systems.

Suitable for

• Domestic hot water production in residential buildings
• Buffer storage for heating systems and heat pumps
• Integration with solar thermal systems
• Combined systems where two separate heat sources are used (e.g., boiler + solar)
• Systems requiring sanitary separation of primary and secondary circuits

Key specifications

• Configuration: vertical cylinder with two internal heat-exchange coils
• Function: indirect heating / heat exchange between primary and secondary circuits
• Material: corrosion-resistant construction suitable for potable water applications
• Coil arrangement: two separate coils to allow connection of two heat sources or circuits
• Application: domestic hot water, buffer storage, solar thermal and heat pump integration

How to use

Connect the primary heat source(s) to the designated coil inlets and the secondary circuit to the tank outlets according to the installer’s piping layout. Commission the system following the manufacturer’s instructions and local regulations, including flushing, filling and ventilating the circuits and verifying correct flow directions. Use appropriate safety devices, pressure relief valves and expansion vessels on the primary and secondary sides as required by the installation. Maintain recommended operating temperatures and perform regular checks for leaks, insulation integrity and correct pump operation.

Usage recommendations

For reliable performance, match the coil heat-exchange capacity with the connected heat sources and maintain correct flow rates through each coil. Ensure routine maintenance of external heat sources and check connections for scaling or sediment if using hard water. When integrating solar collectors or a heat pump, include appropriate controllers and sensors to optimize charging of the buffer and prevent short-cycling.