PPR material itself has no hot or cold distinction. PPR pipes are inherently 'all-rounders', and their molecular structure can maintain stability within the range of -10℃ to 95℃. This means:
The same PPR pipe can be cut into both cold water and hot water fittings.
The same fittings can be used for both standard cold water systems (0-40℃) and hot water systems (40-80℃).
The real difference lies in the wall thickness design; hot water fittings are typically 1-2mm thicker than cold water fittings.
The Practical Logic Behind Color Labels The common gray/white/green PPR fittings on the market actually hide some secrets:
Gray: Mostly used in high-temperature hot water systems, due to the addition of anti-aging agents, resulting in a metallic gray color.
White: Commonly used in cold water systems, with better light transmission for easy observation of water quality.
Green: Fittings specifically for underfloor heating systems, containing a special oxygen barrier layer to prevent microbial growth.
Three Golden Rules for Purchasing Remembering these points will make your piping system more reliable:
Check the wall thickness: Choose 4.2mm or thicker for hot water pipes, 3.5mm is sufficient for cold water pipes.
Test the toughness: A high-quality fitting will not show white marks when bent 180°.
Check the certification: Look for fittings marked with the raw material grade PN2.0/PN2.5.
