What material is recommended for joints in hydronic systems?

Using approved dielectric fittings for joints in hydronic systems is crucial due to the specific requirements these systems present. Hydronic systems often involve the circulation of water through piping, and different metals within the system can lead to corrosion if they come into direct contact with one another, especially in the presence of an electrolyte. Dielectric fittings are designed to electrically isolate these metals to prevent galvanic corrosion, thus extending the life of the system and ensuring safe operation.

Approved dielectric fittings are constructed to withstand the pressures and temperatures typical in hydronic applications while also providing the needed insulation between dissimilar metals. This characteristic is especially important in systems where copper and steel pipes might be connected, as the risk of corrosion becomes pronounced without proper isolation.

Other materials such as rubber, PVC, or steel are not suitable for use in these contexts due to their inability to provide the necessary electrical isolation or compatibility with the temperature and pressure conditions prevalent in hydronic systems. Rubber, for instance, may degrade over time; PVC cannot typically withstand the high temperatures of hot water systems; and connecting steel directly to other metals without an isolating fitting can enhance the potential for corrosion. Therefore, the use of approved dielectric fittings is essential for maintaining the integrity and longevity of hydronic systems.