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• HDPE double wall corrugated pipe has a corrugated outer wall and a smooth inner wall. It is lightweight, flexible, and designed for buried drainage and sewerage applications where high ring stiffness is needed.

• PE pipe (solid-wall HDPE pipe) is flexible, tough, and resistant to chemicals and abrasion. It is widely used for water supply, gas distribution, and slurry transport.

• PPR pipe (Polypropylene Random Copolymer) is a rigid, smooth-walled pipe with excellent thermal resistance. It is mainly used for hot and cold potable water systems in buildings.

• PVC pipe (Polyvinyl Chloride) is a rigid, economical pipe that is resistant to corrosion and chemicals. It is common in drainage, sewer, irrigation, and low-pressure water supply.

In short: HDPE double wall corrugated = drainage/stormwater (buried); PE = flexible pressure pipes; PPR = hot/cold building plumbing; PVC = general low-pressure rigid piping.

• PPR pipe is often preferred for indoor hot and cold drinking water due to its non-toxic nature, high temperature resistance (up to 95°C), and long-term durability.

• PE pipe (especially HDPE) is also widely approved for potable water, particularly for buried water mains and service lines, because of its flexibility, leak-free jointing, and resistance to chemicals and UV (when black).

• PVC pipe can be used for cold drinking water supply but is not suitable for hot water; some older PVC formulations raised health concerns, though modern uPVC is generally safe.

• HDPE double wall corrugated pipe is never used for drinking water because its corrugated exterior is not designed for pressure applications, and it is intended for non-potable drainage.

Recommendation: For hot water inside buildings → PPR. For cold water mains and buried lines → PE. For budget cold water only → PVC.

• HDPE double wall corrugated pipe: Primarily joined with bell-and-spigot with rubber gaskets or couplers with elastomeric seals. Lightweight design allows quick push-fit assembly without heat or solvents.

• PE pipe: Most reliable method is butt fusion (heating ends and pressing together) or electrofusion (using a fitting with embedded wires). Mechanical compression fittings are also used for smaller diameters.

• PPR pipe: Joined by socket fusion (heat fusion) – a special heating tool melts the pipe and fitting simultaneously, then they are pushed together to form a homogeneous, leak-proof joint.

• PVC pipe: Typically joined with solvent cement (chemical welding) for rigid applications, or threaded/gasket joints for certain installations. Solvent welding is fast and low-cost but requires proper curing.

Note: Different joining methods mean these pipes are not interchangeable without transition fittings.

• PPR pipe is excellent for hot water – it can handle continuous temperatures up to 70–80°C and short-term peaks up to 95°C. It is the standard choice for building hot water plumbing.

• PE pipe (including HDPE) is not suitable for hot water. Standard PE begins to soften at around 60°C and loses mechanical strength; it is rated for cold water only (typically below 40°C).

• PVC pipe is also unsuitable for hot water; it starts to deform above 60°C and can release hazardous fumes at high temperatures. Maximum service temperature is about 50–60°C for short periods.

• HDPE double wall corrugated pipe is not designed for pressure or hot fluids; it is strictly for non-pressurized drainage at ambient temperatures (typically <45°C).

Conclusion: For hot water, choose PPR. For cold water or ambient drainage, the other pipes are fine within their temperature limits.