The main materials used in air source heat pumps vary depending on their core components and functional requirements. Below are the main materials used for key components:

Compressor: Typically uses a high-strength cast iron or aluminum alloy casing. Internal moving parts often use wear-resistant alloy steel to withstand high pressure and high-speed operation.

Evaporator (Finned Heat Exchanger):

Pipes: Commonly uses low-finned internally threaded copper tubes to enhance heat exchange efficiency.

Fin Material: Mostly hydrophilic aluminum foil or smooth aluminum foil. Some high-end products use titanium-plated aluminum foil to improve corrosion resistance.

Condenser (Shell-and-tube Heat Exchanger):

Inner Tubing: Commonly made of copper or 316 stainless steel; the latter offers better corrosion resistance in complex water environments.

Outer Tubing: Mostly made of seamless steel pipe, galvanized to enhance rust resistance and pressure resistance.

Connecting Piping:

Refrigerant Piping: Commonly uses copper pipes; small household models typically use 6.35mm or 9.52mm diameter pipes.

Water Piping: PPR pipes (easy to connect) or seamless steel pipes (high strength) are optional.

Insulation Material: Commonly uses PEF rubber-plastic insulation cotton, typically 15–25mm thick, effectively reducing heat loss.

Outer Shell: Mostly uses corrosion-resistant coated steel plates or stainless steel plates; some products utilize five-fold rust prevention technology to extend lifespan.