ท่อทำความร้อนพื้น PEX เทียบกับท่อทองแดง /PE-RT

‌ในระบบทำความร้อนใต้พื้นแบบกระจายอุณหภูมิต่ำ, ท่อเปรียบเสมือนหลอดเลือดของร่างกายมนุษย์, ส่งผลโดยตรงต่อประสิทธิภาพการทำความร้อน, การใช้พลังงานและประสบการณ์การใช้งานในระยะยาว. With the advancement of material technology, เพ็กซ์ (crosslinked polyethylene) ท่อ, copper pipe and PE-RT (high temperature resistant polyethylene) pipe have become mainstream choices. ในบทความนี้, we will compare the four dimensions of ‌ material characteristics, ความต้านทานการกัดกร่อน, thermal conductivity efficiency and installation cost ‌ to help you make cost-effective decisions.

อันดับแรก, material comparison: ความยืดหยุ่น, life and environmental protection

1.‌PEX floor heating pipe: balance of flexibility and durability ‌

PEX pipes are crosslinked to form a three-dimensional mesh structure that combines the flexibility and strength of polyethylene. Its advantages include:

• ‌ดีeformation resistance: -70℃~110℃ tolerance range, can resist the floor heating cycle cold and hot shock.
• ‌มemory resilience: it can recover by itself after accidental flattening during construction to reduce the risk of leakage.
• ‌Environmental protection: no risk of heavy metal precipitation, in line with European Union RoHS standard.

2.คopper pipe: the limitations of traditional metal pipe ‌

Copper pipe is known for its high thermal conductivity, but there are obvious shortcomings:

• ‌ชมigh hardness, difficult to bend: need a large number of joints, increase the potential leakage.
• โอxidation and electrolytic corrosion: especially in alkaline or sulfur-containing water easy to produce patina.
• ‌คost-sensitive: The price of raw materials is significantly affected by the fluctuations of international copper price.

3.‌PE-RT tube: the middle choice of cost-effective ‌

PE-RT improves temperature resistance through molecular structure modification, but compared with PEX:

• วeak pressure resistance: it is easy to creep under long-term high temperature, and its service life is about 20-30 ปี (PEX can reach more than 50 ปี).
• ‌ลimited application scenario: more suitable for low temperature heating system below 60℃.
• บทสรุป: PEX wins in life and adaptability, especially suitable for complex pipe distribution.

ความต้านทานการกัดกร่อน: the ultimate test of water quality and environment

‌PEX tube: the king of chemical inertia ‌

No reaction to acid, alkali and salt solution (pH 2-12), chloride ions, no need to clean regularly.

กรณี: 90% of the floor heating in Northern Europe uses PEX pipes to deal with high mineral groundwater without pressure.

Copper pipe: potential minefield of corrosion risk ‌

• อีlectrochemical corrosion: it is easy to form local battery effect in water with high oxygen content.
• สulfide corrosion: the water in some areas of China is high in sulfur, which is easy to form black copper sulfide scale.
• Maintenance cost: need to add corrosion inhibitor regularly, annual maintenance cost of about 300-500  /100㎡.

‌PE-RT tube: stability is inferior to PEX‌

After long-term use, it may cause embrittlement due to oxidation, and the joint is easy to crack.

บทสรุป: PEX is almost maintenance-free, especially suitable for complex water quality environment in China.

Thermal conductivity Efficiency: The misunderstood “metal advantage”

1.ดีata comparison ‌

2.Metal thermal conductivity ≠ actual advantage ‌

• ตhermal inertia: copper pipe has strong heat storage, leading to slow temperature rise/cooling, which is not conducive to accurate temperature control.
• โอffset by heat loss: the copper tube requires additional insulation (20% more cost), and PEX has low thermal conductivity.
• คุณniformity: PEX tubes can be densely-coiled to compensate for thermal conductivity differences and achieve more balanced heat dissipation.
• บทสรุป: The actual heating effect of PEX is close to that of copper tube, and the energy saving is improved by 10%-15%.

ค่าติดตั้ง: a money-saving code for hidden projects

คomprehensive cost comparison (taking 100㎡ house as an example) ‌

‌PEX construction advantages ‌

• ‌สingle pipe continuous laying: no joint design to reduce 90% leakage points.
• ตool simplification: special clamping tool instead of copper pipe welding, shorten the construction period by 40%.
• ชมigh fault tolerance: support non-professional DIY repair (such as the use of hot melt sleeve).
• บทสรุป: The comprehensive cost of PEX is only 1/3 of that of copper pipe, and the later maintenance is almost zero investment.

Final Choice: Why is PEX the future Trend?

1.Trends from industry data ‌

PEX will account for 68% of the global floor heating pipe market in 2025 (data source: GIA report).

The adoption rate of PEX in newly installed residential floor heating systems in China jumped from 32% ใน 2015 ถึง 79% ใน 2025.

2.สcenario-based recommended ‌

Preferred PEX‌: suitable for 90% of families, especially the transformation of old houses and complex units.

Carefully select copper pipe: It is only recommended for commercial places (such as gyms) with UHF start and stop, and soft water system is required.

‌PE-RT alternative: southern areas with extremely limited budgets and short heating seasons.

The iterative nature of underfloor heating pipe is an upgrade in user value — PEX achieves higher reliability at lower cost, which is the perfect combination of materials science and engineering wisdom.

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