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Zhejiang Sanli Pipe Technology Co., Ltd.
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Core Underfloor Heating Pipes — SANLI
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Core Underfloor Heating Pipes

Five series · 14 SPUs · 43 SKUs — from standard PE-RT to premium copper-plastic: material, oxygen barrier and structure on one page.

5series14active SPUs43active SKUs
Core Pipe Series

Core Product Series

The five series expand into 14 SPUs; open each SPU to see the active sizes (SKUs). Size tags = OD × wall thickness (mm).

PE-RT Pipes

PE-RT Series

PE-RT (heat-resistant polyethylene) base pipe for underfloor heating: flexible, fusion-weldable and the cost-effective choice for heating projects.

  • S5 pressure class, covering common dn16–dn20 heating sizes
  • Fusion and mechanical joints supported for easy on-site work
  • OD, wall thickness and colour customizable per project
PE-RT Series
PE-RT Standard Underfloor Heating PipeSL-RT-STD2 SKU

Single-layer PE-RT structure — the workhorse and mainstream choice for standard heating loops.

dn16×2.0dn20×2.0
Pressure S5Coil length 100 / 200 / 300 mWeight per metre 8.4–10.7 kg/100m
PEX Pipes

PEX Series

Cross-linked polyethylene pipe: better temperature and creep resistance than PE-RT, suited to high-temperature hot water and long-life design loops; a / b / c denote the cross-linking method, not a grade.

  • Three cross-linking methods: peroxide (a) / silane (b) / electron-beam (c)
  • Single-layer and double-layer structures available
  • Covers dn16–dn32, including large-bore main lines
PEX Series
PEX-a Single-Layer Underfloor Heating Pipe (peroxide cross-linked)SL-PEXA-S4 SKU

Uniform cross-linking and good flexibility for complex coil routing.

dn16×2.0dn20×2.0dn25×2.3dn32×2.9
Pressure S5 / S4Coil length 100 / 200 / 300 mWeight per metre 8.4–25.2 kg/100m
PEX-a Double-Layer Underfloor Heating Pipe (peroxide cross-linked)SL-PEXA-D4 SKU

Co-extruded double layer with a scratch-resistant surface for tough job sites.

dn16×2.0dn20×2.0dn25×2.3dn32×2.9
Pressure S5 / S4Coil length 100 / 200 / 300 mWeight per metre 8.4–25.2 kg/100m
PEX-b Double-Layer Underfloor Heating Pipe (silane cross-linked)SL-PEXB-D4 SKU

Mature silane cross-linking with stable stiffness and pressure performance.

dn16×2.0dn20×2.0dn25×2.3dn32×2.9
Pressure S5 / S4Coil length 100 / 200 / 300 mWeight per metre 8.4–25.2 kg/100m
PEX-c Single-Layer Underfloor Heating Pipe (electron-beam cross-linked)SL-PEXC-S4 SKU

Electron-beam cross-linking leaves no chemical residue in production.

dn16×2.0dn20×2.0dn25×2.3dn32×2.9
Pressure S5 / S4Coil length 100 / 200 / 300 mWeight per metre 8.4–25.2 kg/100m
Oxygen Barrier Pipes

Oxygen-Barrier Series

Co-extruded EVOH oxygen barrier blocks oxygen ingress and protects boilers, manifolds and other metal parts — for closed heating systems with higher anti-corrosion requirements.

  • EVOH barrier meets low oxygen-permeability requirements
  • PE-RT / PEX-a / PEX-b base materials available
  • Protects metal components in closed heating systems
Oxygen-Barrier Series
PE-RT/EVOH Oxygen-Barrier Underfloor Heating PipeSL-RT-EVOH2 SKU

PE-RT base + EVOH barrier: cost-effective oxygen protection for closed systems.

dn16×2.0dn20×2.0
Pressure S5Coil length 100 / 200 / 300 / 400 mWeight per metre 8.4–10.7 kg/100m
PEX-a/EVOH Oxygen-Barrier Underfloor Heating PipeSL-PEXA-EVOH2 SKU

Peroxide-cross-linked base + EVOH: temperature resistance and barrier in one.

dn16×2.0dn20×2.0
Pressure S5Weight per metre 8.4–10.7 kg/100m
PEX-b/EVOH Oxygen-Barrier Underfloor Heating PipeSL-PEXB-EVOH2 SKU

Silane-cross-linked base + EVOH: a mature oxygen-barrier choice.

dn16×2.0dn20×2.0
Pressure S5Weight per metre 8.4–10.7 kg/100m
Aluminum-Plastic Pipes

Multilayer (Aluminum-Plastic) Series

Composite structure with an intermediate aluminum layer (PEX-AL-PEX / PEX-AL-PE-RT): low linear expansion, excellent dimensional stability, straight-wall routing, and no spring-back after tool bending.

  • Two aluminum welding processes: lap-weld / butt-weld
  • Aluminum layer 0.21–0.30 mm — structural oxygen barrier in one step
  • Derivatives: pre-insulated pipe, PEX-a/AL/PE-RT composite pipe
Multilayer (Aluminum-Plastic) Series
PEX-AL-PEX Multilayer Pipe (lap-welded)SL-MLP-LAP4 SKU

Classic lap-welded aluminum layer — multilayer pipe for heating and water supply.

dn16×2.0dn20×2.0dn25×2.5dn32×3.0
Pressure S3.2 / S4Coil length 100 / 200 mWeight per metre 10.0–30.6 kg/100m
PEX-AL-PEX Multilayer Pipe (butt-welded)SL-MLP-BUT5 SKU

Butt-welded aluminum layer with higher seam strength, including dn26.

dn16×2.0dn20×2.0dn25×2.5dn26×3.0dn32×3.0
Pressure S3.2 / S4Coil length 100 / 200 mWeight per metre 10.0–30.6 kg/100m
PEX-AL-PEX Pre-Insulated Multilayer PipeSL-MLP-INS2 SKU

Factory-applied insulation layer saves on-site insulation for direct burial and wall routing.

dn16×2.0dn20×2.0
Pressure S3.2Coil length 100 / 200 mWeight per metre 13.5–16.5 kg/100m
PEX-a/AL/PE-RT Multilayer Composite PipeSL-MLP-A3 SKU

PEX-a cross-linked inner layer with a PE-RT outer: balanced temperature resistance and cost.

dn16×2.0dn20×2.0dn25×2.5
Pressure S3.2 / S4Weight per metre 10.0–19.9 kg/100m
PEX-b/AL/PE-RT Multilayer Composite PipeSL-MLP-B3 SKU

Mature combination: silane-cross-linked PEX-b inner with PE-RT outer.

dn16×2.0dn20×2.0dn25×2.5
Pressure S3.2 / S4Weight per metre 10.0–19.9 kg/100m
High-end Copper-Plastic Pipes

Copper-Plastic Pipe · Premium Series

Premium copper-plastic composite pipe: pure copper inner layer + plastic-coated outer, combining the strength and bacteriostatic property of copper with the corrosion resistance and easy bending of plastic — positioned for high-end residential and exposed heating loops.

  • Pure copper inner layer: outstanding strength and bacteriostatic property
  • Plastic-coated outer: corrosion-resistant, bendable, easy to install
  • Positioned for high-end residential and exposed heating loops
Copper-Plastic Pipe · Premium Series
Copper-Plastic Pipe (plastic-coated copper / copper-plastic composite)SL-CUPLAS2 SKU

Copper core + plastic coating: copper strength with plastic corrosion resistance and workability.

dn16×2.0dn20×2.0
Coil length 100 mWeight per metre ≈ 30–42 kg/100m
Featured Services

Featured Services

Three capabilities beyond the standard range.

Insulation Upgrade

Insulation Upgrade

Factory-applied insulation cotton (red/blue duo available): uncoil and bury or route on walls directly, skipping on-site insulation — ideal for severe-cold regions.

  • Insulated multilayer pipe SL-MLP-INS in mass supply
  • Two-colour insulation tells supply / return apart at a glance
  • Insulation thickness and colour customizable per project
OEM / Customization

OEM / Customization

OD, wall thickness, colour, coil length, packing and logo all customizable; new material combinations and aluminum layer thickness are negotiable too.

  • Common OD 16 / 20 / 25 / 26 / 32 mm, others customizable
  • Free packing size & logo customization from 10,000 m
  • MOQ 10,000 m per size
One-Stop Supply

One-Stop Supply

Nine supply lines — manifolds, valves, fittings, controls and more — matched on one order with a single accountable interface.

  • Nine supply lines matched on one order
  • Consolidated packing and door-to-door logistics on demand
  • Pipes + system components under a single accountable interface
See the one-stop supply platform →
Request a Quote

Submit Your Inquiry

Pick series, size and quantity in the online inquiry form and get a quote with packing plan within 24 hours; or download the Excel product list and parameter sheet for internal evaluation first.

Quote in three steps

  1. Check series and size: match the SPUs / SKUs of the five series on this page
  2. Submit the online inquiry: quantity, lead time and trade terms (EXW / FOB)
  3. Reply within 24 hours: quotation, packing and logistics plan
Open the online inquiry form → AI self-service quoting →

Wired to our quote knowledge base for instant size & quantity estimates

Download Excel product list & parameter sheet ↓ Inquire by email

Quoting basis: calculated by specification, quantity and trade terms; reply within 24 hours. Unit prices are not published on the page.

How Pipes Are Classified

How Underfloor Heating Pipes Are Classified

Three dimensions to understand product differences and grades.

DIM 01

Base Material

Role:The root factor behind fusion weldability, flexibility, pressure resistance and service life — and it determines the connection system (press, push-fit or fusion).

PE-RTPEX-aPEX-bPEX-cCopper
DIM 02

Oxygen Barrier

Role:Oxygen permeation is the main cause of metal-part corrosion and shortened life of manifolds and boilers; whether and how a pipe blocks oxygen directly determines its grade.

No barrierEVOHAluminum layer3-layer structure5-layer structure
DIM 03

Structure Form

Role:Single-layer pipe is flexible to install but expands more linearly; multilayer composite pipe is dimensionally stable, supports straight-wall routing and does not spring back after tool bending.

Single-layerMultilayerPEX-AL-PEXPEX-AL-PE-RTCopper multilayer composite
NOTE PEX-a / b / c are essentially a classification of cross-linking method (peroxide / silane / electron-beam), not high/mid/low grades; select by system design and connection method, not by the letter.

Wholesale, OEM private-label and distribution — leave your requirement and get a quote within 24 hours.

Email sanlipipe@163.com · WhatsApp +86 150 6880 2744 · video factory audit available

1-minute enquiry, quote within 24 hours

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