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10sqm Twin-wall Panel Underfloor Heating - PP Tacker System
Guides · PE-RT · PE-Xa · Multilayer Composite Pipe · EVOH · DIN 4726
Heating Pipes for Underfloor Heating 2026 – PE-RT, PE-Xa & Multilayer Composite Pipes Compared
Heating pipe on 200 m / 600 m reel – available directly from stock
EVOH oxygen barrier layer mandatory according to DIN 4726 – prevents corrosion throughout the entire system
PE-RT, PE-Xa & Multilayer Pipes – the right pipe for every application
Optimized for heat pumps – 16 x 2 mm and 17 x 2 mm, 30–45 °C flow temperature, GEG § 60 compliant
Heating pipe for underfloor heating
Which heating pipe is the right one – and why is the EVOH barrier layer mandatory?
The heating pipe is the basis of every underfloor heating system: Without the right pipe, neither a heat pump nor a condensing boiler can work efficiently. The most important technical requirement is oxygen tightness according to DIN 4726: The EVOH barrier layer prevents atmospheric oxygen from diffusing through the pipe wall into the heating water – the oxygen would corrode all steel components (boiler, pump, manifold) from the inside.
Three pipe types are available: PE-RT EVOH (from €0.48/m) – inexpensive, flexible, standard for tacker plates. PE-Xa EVOH (from €0.66/m) – cross-linked, higher continuous temperature resistance up to 95 °C, ideal for higher operating pressures. PE-RT-ALU-PE multilayer composite pipe (from €0.70/m) – dimensionally stable after bending, minimal thermal expansion (0.025 mm/m·K instead of 0.14 mm/m·K for PE), SKZ and DVGW certified.
For heat pump systems with 30–45 °C flow temperature, all three types are suitable – the decisive factor is the installation system: Tacker and KLETT with 16 × 2 mm, clamping rail with 16 × 2 or 17 × 2 mm, wet screed constructions with up to 20 × 2 mm.
16 × 2 mm
Standard Dimension
70–95 °C
max. continuous operation
10 bar
Operating pressure
5 × OD
Minimum bending radius
≤ 0.1 mg
O₂ permeability/m²·d·bar
200 m
Standard roll length
Common heating pipe errors
Your problem – our solution
Making the right technical decisions when it comes to heating pipes can save expensive renovations later on.
Problem
No oxygen barrier: Heating pipe without an EVOH barrier layer allows atmospheric oxygen to diffuse through the pipe wall – boiler corrosion, rust sludge in the system, blockage of the heating circuit manifold.
Lösung
EVOH barrier layer according to DIN 4726: Oxygen permeability ≤ 0.1 mg/(m²·d·bar). All pipe types (PE-RT, PE-Xa, multi-layer composite pipe) with integrated EVOH layer or aluminum barrier layer.
Problem
Incorrect diameter: 16 x 2 mm for circuits > 100 m overloads the circulation pump – pressure loss too high, uneven heating, noise generation in the pipe system.
Lösung
Dimensioning by circuit length: 16 × 2 mm up to 100 m, 17 × 2 mm up to 120 m, 20 × 2 mm up to 140 m. Hydraulic balancing at the manifold (GEG § 60) compensates for remaining differences.
Problem
Wrong material for heat pump: PE-RT without an aluminum layer expands significantly (0.14 mm/m·K) – for 600 m of pipe in the screed, this can lead to length changes of up to 8 cm, which can cause cracks in the screed.
Lösung
Multilayer composite pipe PE-RT-ALU-PE: only 0.025 mm/m·K thermal expansion – six times less than simple PE. Or correct expansion joint planning according to DIN 18560 for single-layer pipes.
Pros & Cons
Pros & Cons: Heating pipe for underfloor heating
All three pipe types honestly evaluated – for the right purchasing decision.
Benefits
- EVOH Oxygen Barrier Layer according to DIN 4726 – protects the entire heating system against corrosion
- Three material types for every application: PE-RT (cost-effective), PE-Xa (flexible/high-temperature), Multi-layer Composite (dimensionally stable)
- Heat pump optimized: 30–45 °C flow temperature, all pipe types suitable for low-temperature systems
- 16 × 2 mm & 17 × 2 mm: suitable for all common installation systems (tacker, hook and loop, clamp rail, studded mat)
- 200 m and 600 m rolls: fewer connection points, faster installation, lower leakage risk
- Tested according to EN ISO 22391, EN ISO 15875, DIN EN ISO 21003 – compliant with all European standards
Disadvantages
- PE-Xa: Stiffer pipe – compared to PE-RT, higher force required for laying in tight radii
- Multilayer composite pipe: heavier weight, higher material price – often oversized for straightforward new builds
- Pipes in screed permanently inaccessible – dimensioning and installation errors must be corrected before concreting
Applications
Which heating pipe is suitable for which project?
From heat pumps in new builds to gas floor heating in old buildings – making the right choice.
Heat pump
OptimalAll pipe types for 30–45 °C; multi-layer composite pipe preferred for long circuits (less expansion)
New screed
OptimalPE-RT EVOH 16 × 2 mm: most affordable and most commonly used pipe for tacker plates
Drywall renovation
OptimalPE-Xa 16 × 2 mm: high flexibility for tight radii, low installation height, clamp rail system
HOOK AND LOOP system
OptimalKLETT PE-RT or PE-Xa: specially matched to the MC Therm KLETT laying system
Commercial / Large-scale
Geeignet20 x 2 mm metal composite pipe: up to 140 m circuit length, lower pump load for large areas
Thin-layer / Dry system
OptimalPE-Xa 16 × 2 mm: tight bending radius 80 mm, ideal for system panels with pre-formed grooves
Gas/oil heating
GeeignetPE-Xa 95 °C continuous operation also easily covers higher supply temperatures up to 55 °C
Old building high temperature
GeeignetPE-Xa EVOH: 95 °C continuous operation, 110 °C short-term – also suitable for old boilers with high flow temperatures
Optimal
Geeignet
Bedingt
Nicht geeignet
Prices & Costs
How much does underfloor heating pipe cost?
Price Overview 2026 – PE-RT, PE-Xa and Multilayer Composite Pipe Compared.
0.48 – 0.70
€/m
PE-RT EVOH from €0.48/m (200 m roll). PE-Xa EVOH from €0.66/m. PE-RT-ALU-PE multilayer composite pipe from €0.70/m. For 100 m² living space with 15 cm pipe spacing: approx. 670 m pipe ≈ €320–470 material.
Lower the price
- PE-RT EVOH: Easiest Processing, Lowest Material Price – Ideal for Standard Projects
- 600 m large roll saves 15–20% vs. 200 m roll – worthwhile from 3+ heating circuits
- DIY Installation: no tools other than a staple gun or pliers – no tradesperson required
Raises the price
- PE-Xa instead of PE-RT: approx. +€0.18/m – for high temperatures, tight radii or dry construction
- Multi-layer composite pipe: approx. +0.22 €/m compared to PE-RT – recommended for very long circuits (> 80 m)
- 17 x 2 mm instead of 16 x 2 mm: higher material requirements, but possible up to 120 m circumference
- Screed Heating Instructions (Heat-Up Protocol): one-time fee of approx. €80–150 – for new builds, provided by the screed layer
Prices are based on current list prices 2026. Details in the cost guide.
Standards & Regulations
Standards & legal requirements for heating pipes
DIN 4726
Oxygen Barrier Plastic Pipes
Core requirement for heating pipes: Oxygen permeability ≤ 0.1 mg/(m²·d·bar). An EVOH layer (PE-RT, PE-Xa) or ALU layer (multi-layer composite pipe) fulfills this requirement. Pipes without a barrier layer may not be used in closed heating circuits.
EN ISO 22391
PE-RT pipes for hot/cold water
Specifies material requirements, dimensions, and test methods for PE-RT (polyethylene of raised temperature resistance). Two types: PE-RT Type I (linear polymer, up to 70 °C continuous operating temperature) and Type II (modified, up to 90 °C).
EN ISO 15875
PE-Xa pipes for hot/cold water
Regulates requirements for peroxide-crosslinked PE-Xa (Engel method). Higher continuous operating temperature (95 °C), higher pressure resistance, shape memory after deformation. Mandatory proof: Cross-linking degree ≥ 70 % (PE-Xa according to ISO 10147).
DIN EN ISO 21003
Multi-layer composite pipe PE/ALU/PE
Standard for PE-RT-ALU-PE and PE-Xa-ALU-PE multilayer composite pipes. Regulates layer structure, adhesive bond between plastic and aluminum, pressure testing, and heat resistance. SKZ and DVGW certification confirms conformity to the standard.
DIN 18560 / EN ISO 11855
Screed & Underfloor Heating Design
DIN 18560 regulates screed constructions including the heating protocol (screed drying phase). EN ISO 11855 regulates the design, heating load calculation, and circuit length determination for surface heating systems.
DIN 4726 is the most important standard for heating pipes: No plastic pipe without an EVOH or ALU barrier layer may be installed in closed heating circuits. All offered pipes (PE-RT EVOH, PE-Xa EVOH, PE-RT-ALU-PE) comply with DIN 4726, EN ISO 22391/15875 and are approved for use in GEG-compliant low-temperature systems with heat pumps.
Guides & Knowledge
All Heating Pipe Guides for Underfloor Heating
All guidesMaterial comparison, installation instructions, quantity calculation & costs – the complete guide.
Material Comparison · 10 min
PE-RT vs. PE-Xa vs. Multi-Layer Composite Pipe: Which Heating Pipe is Right for You?
Three pipe types in direct comparison: price, temperature, flexibility, heat pump suitability.
Jetzt lesen → Instructions · 12 minInstalling underfloor heating pipes: Staples, clamping rail & VELCRO instructions
Choose a laying system, set the laying distance, bend and fasten – step by step.
Jetzt lesen → Calculation · 9 minCalculating Underfloor Heating Pipes: Pipe Length, Spacing & Quantity Determination
Meters per m², circumference, roll requirement – with formulas, tables, and calculation examples.
Jetzt lesen → Cost Guide · 8 minHeating Pipe Costs 2026: Prices per meter, m², and complete system
PE-RT from €0.48/m to multi-layer composite pipe €0.70/m – all costs for any system size.
Jetzt lesen →Does it fit?
The complete underfloor heating system
Heating pipe, manifold, installation system and control – all perfectly coordinated.
Duty
Stainless steel manifold for heating circuits
Stainless steel heating circuit distributor with integrated flow meters – the counterpart to the heating pipe for each heating circuit.
Recommended
Installation system
Tacker plates, VELCRO mats, clamping rails, and system panels for professional pipe installation.
GEG Section 61
Actuators & Thermostats
Engo Actuators and Room Thermostats – for individual room control according to GEG § 61.
Frequently Asked Questions
FAQ Heating Pipe Underfloor Heating
For standard projects (new construction, wet screed, tacker system): PE-RT EVOH 16 × 2 mm from €0.48/m – affordable, easy to lay, sufficient for 30–70 °C. For renovation, dry construction, and tight bends: PE-Xa EVOH 16 × 2 mm from €0.66/m – more flexible, higher temperature resistance. For very long circuits and high dimensional stability: PE-RT-ALU-PE multilayer composite pipe from €0.70/m. All three comply with DIN 4726 oxygen tightness.
Plastic pipes without a barrier layer are gas-permeable: atmospheric oxygen diffuses through the pipe wall into the heating water and oxidises all iron parts in the system (boiler, pump, manifold). The consequences: rust sludge, corrosion damage, blockages. DIN 4726 therefore stipulates an oxygen permeability of ≤ 0.1 mg/(m²·d·bar) for all heating pipes in closed systems. An EVOH barrier layer or an aluminium layer fulfils this requirement.
Rule of thumb by laying distance: 10 cm = 10 m/m² (bathroom, edge zone), 15 cm = 6.7 m/m² (standard living areas), 20 cm = 5 m/m² (heat pump, well-insulated new building). For 100 m² living space with 15 cm distance: 670 m + approx. 30 m supply lines = ~700 m. Detailed calculation formula in the calculation guide.
The outer diameter determines the maximum pipe cross-section and thus the maximum circuit length: 16 × 2 mm up to approx. 100 m, 17 × 2 mm up to approx. 120 m. The inner cross-section for 17 × 2 mm (13 mm ID) is slightly larger than for 16 × 2 mm (12 mm ID) – the pressure loss is lower. For typical living rooms up to 20 m², 16 × 2 mm is sufficient. For open living-dining rooms > 30 m² or long supply lines, prefer 17 × 2 mm.
For heat pumps with a low-temperature flow of 30–45 °C, both materials are equally suitable – the operating temperature is well below the limit values. Flexibility is crucial: PE-RT is softer and easier to install, while PE-Xa has less springback after bending. With multi-layer composite pipes, cracks in the screed due to temperature fluctuations are less likely due to the lower thermal expansion (0.025 vs. 0.14 mm/m·K).
Generally no – the same pipe should always be used within a heating circuit. Different materials have different coefficients of thermal expansion and pressure losses, which complicates hydraulic balancing. However, within a building, different circuits can have different pipe materials – e.g., PE-RT for simple rooms, PE-Xa for bathrooms with a tight radius. Connections between pipe types should only be made using compression fittings, never by welding or gluing.
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