What is the difference between brass and steel manifolds? When should you choose which option?

An underfloor heating manifold is an essential component of this type of heating system for apartments and houses. Its primary function is to distribute the heating medium to individual circulation loops in order to transfer heat to the rooms. They ensure that proper operating parameters are maintained independently for each circuit of the underfloor heating system.

Which underfloor heating manifold should you choose?

Currently, there are various types of manifolds available on the market, differing not only in the material from which they are made but also in their components. The main components of a manifold are the distribution bars. They can be made of brass, stainless steel, or, less commonly, plastic. Depending on their intended use, manifolds may be equipped with thermostatic valves, manual control valves, ball shut-off valves, reducer nipples, compression fittings, rotameters, air vents, and drain valves. Given the wide variety of such products, those considering a purchase often wonder whether to choose a brass or steel manifold. In this article, we present the characteristics of these two types of underfloor heating manifolds.

What are the characteristics of CW617N brass?

CW617N brass is characterized by excellent properties in terms of strength, hardness, wear resistance, and corrosion resistance. It is the material most commonly used for water fittings. Stainless steel also has excellent properties. The AISI 304 grade is highly resistant to rust as well as to most oxidizing acids, making it widely used

in industry, including the food industry.

What should you keep in mind when choosing a manifold?

It is important to remember that manifolds operate in a relatively non-aggressive environment. Most often, underfloor heating is a closed-loop system—that is, one where the fluid is not exposed to air and where extreme temperatures do not occur—which contributes to the manifolds’ very long service life.

The material used for the manifold body does not significantly affect the manifold’s performance. It should be noted that a steel manifold is lighter than a brass one, which may make it easier to install.

Are you wondering which manifold to choose for your underfloor heating system? When selecting a solution, you should first and foremost consider the manifold’s features and the quality of its components. It’s worth checking whether the manifold comes pre-assembled from the factory and includes a leak-tightness warranty, or if it requires additional work by an installer during installation.