Which type of joints should hydronic piping connections between steel tubing and fittings use?

The correct choice for joints in hydronic piping connections between steel tubing and fittings is mechanical or welded joints. These types of connections are essential for ensuring the integrity and durability of the system, particularly in hydronic applications where high pressures and temperatures may be involved.

Mechanical joints offer flexibility and ease of assembly, allowing for connections that can be disassembled and reassembled without significant effort or tools. These joints typically utilize fittings that allow pipes to be fitted together securely, which is advantageous for maintenance and repairs in hydronic systems.

Welded joints, on the other hand, provide a permanent connection that is strong and leak-proof, making them well-suited for high-pressure environments often found in hydronic systems. This type of joint eliminates potential failure points that could arise from mechanical connections over time, ensuring a more reliable and robust installation.

Using soldered or brazed joints can be inappropriate in certain hydronic applications due to the potential for overheating, which can weaken the integrity of the connections when dealing with steel tubing under pressure. Threaded or compression joints may not provide the same level of robustness and can be susceptible to leaks under high pressure. Flanged or clamp connections, while useful in certain scenarios, can also be less reliable when compared to welded or mechanically joined