What are the common materials for water pipe fittings in air-to-water heat pump systems?

Release time:

2026-06-04

Author:

Common materials for water pipe fittings in air-to-water heat pump systems mainly include stainless steel, brass, PPR, and various fluoroplastics. Each material has different physical characteristics and is suitable for different installation scenarios.

What are the common materials for water pipe fittings in air-to-water heat pump systems?

Stainless Steel Fittings
Stainless steel fittings offer good corrosion resistance and oxidation resistance, requiring virtually no maintenance in the long term and providing a very long service life. They have high strength, can withstand significant pressure and weight, and offer good safety. Furthermore, stainless steel fittings connected by welding can achieve a permanent, leak-free seal, making them highly suitable for air-to-water heat pump systems that demand high water quality, require maintenance-free operation, or need to resist rust.

Brass (Copper) Fittings
Brass (copper) fittings have good thermal conductivity and strong corrosion resistance, and are not easily affected by water quality or environmental factors such as acids and alkalis. Brass unions or brass fittings are also a common choice for pipeline connections on the water pump side of air-to-water heat pump systems. Common connection methods include compression fittings and welding.

PPR Fittings
PPR fittings are non-toxic, pressure-resistant, and corrosion-resistant, making them suitable for both hot and cold water pipes. Their connection method is typically heat fusion (socket welding), which allows the fitting to fully bond with the pipe, effectively reducing pipe aging and water seepage. PPR material is lightweight, durable, and resistant to aging, making it a widely used material for household hot and cold water piping.

Fluoroplastic Fittings (e.g., PTFE, PFA, PVDF)
Fluoroplastic fittings offer excellent corrosion resistance, high-temperature resistance, and chemical stability. They are primarily used in industries such as chemicals, semiconductors, pharmaceuticals, and water treatment, where fluid transport requires strict control and high purity.

In practical applications, there is no absolute "best" fitting material. Users need to make a comprehensive selection based on the specific medium used in the heat pump system, water quality conditions, pressure requirements, and actual installation circumstances.

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Can pneumatic fittings be used for water circuit connections in an air-to-water heat pump water heater?

It is not recommended to use pneumatic fittings for the water circuit connections of an air-to-water heat pump water heater.