PEX EVOH has much lower thermal conductivity
PEX EVOH pipes have a thermal conductivity of 0.39 W/m·K. Copper pipes have 401 W/m·K. This is a 1000-fold difference. Example: PEX EVOH is a thermal insulator; copper is a thermal conductor.
Heat loss comparison
Copper pipes lose heat quickly in hot water systems. The pipe conducts heat to the surrounding air. This causes energy loss in heating systems. PEX EVOH pipes retain heat much more effectively.
Insulation advantage
PEX EVOH pipes require less external insulation. The pipe material itself provides insulation. This reduces insulation thickness and cost. PEX EVOH pipes are naturally insulating.
Cold water condensation
Copper pipes can cause condensation in cold water systems. Cold copper pipes sweat and drip. PEX EVOH pipes do not condense as easily. PEX EVOH pipes reduce the risk of condensation.
Energy efficiency
Hot water systems lose less energy with PEX EVOH. The pipe keeps the water hot during distribution. This saves energy and reduces heating costs. PEX EVOH pipes improve system efficiency.
Example: hot water distribution
A building uses PEX EVOH pipes for hot water. The water stays hot over long distances. Copper pipes would lose heat quickly. Example: more efficient hot water delivery.
Example: underfloor heating
Underfloor heating uses PEX EVOH pipes at 40-60°C. The pipe retains heat for the floor. Copper pipes would lose heat to the concrete. Example: better heat transfer to the floor.
Example: chilled water systems
A chilled water system uses PEX EVOH pipes. The pipe does not sweat or condense. Copper pipes would drip in humid conditions. Example: a dry, efficient cooling system.
Thermal bridging
Copper pipes create thermal bridges in buildings. They conduct heat through insulation. PEX EVOH pipes do not create these bridges. PEX EVOH pipes improve building thermal performance.
System design differences
Copper systems need more insulation and pipe tracing. PEX EVOH systems require less. This simplifies installation and reduces costs. PEX EVOH pipes are easier to design.
Fire safety considerations
Copper is non-combustible and conducts heat. PEX EVOH is combustible but has lower thermal conductivity. This affects fire safety design. PEX EVOH pipes have different fire characteristics.
Final thermal conductivity summary
PEX EVOH pipes have very low thermal conductivity (0.39 W/m·K). Copper pipes have extremely high conductivity (401 W/m·K). This makes PEX EVOH an excellent thermal insulator. Copper pipes lose heat quickly in hot water systems. PEX EVOH pipes retain heat and improve energy efficiency. They also reduce condensation in cold water systems. PEX EVOH pipes require less insulation than copper. They are more energy-efficient for hot water distribution. Example: a more efficient and cost-effective piping choice.