Secondary Heat Exchangers

Heat Exchangers for Boilers and DHW Systems

A modern domestic hot water (DHW) system represents a standard of quality living, production efficiency, and engineering excellence. At the heart of this system lies the secondary heat exchanger — a key component responsible for transferring heat from the heating circuit to the water used in daily life and industrial processes.

Teplo-Polis is a manufacturer of high-quality heat exchangers, custom-made to meet the individual requirements of each client.

What Is a Secondary Heat Exchanger and Why Is It Needed

Unlike a primary heat exchanger, which is directly heated by a thermal source (such as a burner in a boiler), a secondary heat exchanger receives heat from the heating system and transfers it to the water for DHW needs.

This operating scheme plays a crucial role in systems with double-circuit boilers, individual heating substations (IHS), and central heating substations (CHS). In these systems, the secondary heat exchanger separates the heating and DHW circuits. This is essential to prevent sanitary water contamination from corrosion products and sediment from the heating system, and to protect heating components from the effects of mains water.

Advantages of Teplo-Polis Heat Exchangers

Using secondary heat exchangers produced by Teplo-Polis provides several significant advantages:

• The design of Teplo-Polis heat exchangers ensures a high heat transfer coefficient, enabling fast and efficient DHW heating.
• High-quality materials resistant to corrosion and high temperatures are used in production, ensuring long service life of the equipment.
• Modern plate heat exchangers are compact and lightweight, which simplifies installation and maintenance.

Teplo-Polis offers custom-designed heat exchangers, allowing for the optimal solution for each specific system and site.

Applications of DHW Heat Exchangers

Secondary heat exchangers are widely used across various facilities:

• In IHS of apartment buildings, heat exchangers ensure independent DHW generation for residents’ needs.
• As part of DHW preparation systems for various consumer types.
• Hotels, shopping centres, and office buildings use DHW heat exchangers to provide comfort for visitors and staff.
• Industrial facilities with local DHW systems — to support technological processes and sanitation needs.
• Domestic double-circuit boilers — for heating water in flats or private houses.

How to Select and Purchase a Heat Exchanger for a Boiler or DHW

Purchasing a heat exchanger is an engineering task — a mistake can result in unnecessary expenses, frequent maintenance, or, in the worst case, system shutdown. This is especially critical when working with boilers, IHS, and DHW systems, where stable hot water supply directly depends on precise calculation.

To ensure a boiler heat exchanger or secondary DHW heat exchanger functions effectively, the following must be taken into account:

• Thermal load — how much energy the system must transfer to the water. Overestimating or underestimating leads to uneven heating, heat losses, and unstable water temperatures.
• Type of heat carrier — water, antifreeze, steam. Depending on the medium, plate material, soldering, sealing, and resistance to aggressive environments are selected.
• System pressure and temperature — these determine the construction type, required plate thickness, and reliability of joints.
• Connection type and dimensions — important for compatibility with existing equipment and ease of installation.

There are no universal solutions in this field. A standard “off-the-shelf” heat exchanger might work — or might not. Even water hardness or seasonal load differences impact the calculation. This is especially true in systems with unstable pressure or in areas with hard water, where channels of standard models clog quickly.

Why It Is More Profitable to Order a Custom Calculation

Teplo-Polis offers free calculation of heat exchangers for DHW and boiler systems. Our engineers take into account:

• all initial data (temperature, pressure, volumes);
• real operating conditions;
• the specific features of the customer’s equipment.

For the customer, this means:

• no overpayment for unnecessary capacity “reserves”;
• no risk of breakdowns due to incorrect capacity selection;
• optimal balance of price, efficiency, and service life.

By choosing Teplo-Polis, you receive a reliable and efficient DHW solution tailored to your individual needs. Submit your request — and get an accurate calculation from Teplo-Polis engineers within 24 hours.