PE-RT pipe Termojet 16×2, 6 bar, 70°C (500m)

Termojet PE-RT 16×2 pipe — a polyethylene raised-temperature-resistance pipe for laying underfloor heating system circuits. Outer diameter 16 mm, wall thickness 2 mm, working pressure 6 bar, maximum coolant temperature 70°C. The pipe is supplied in a coil of 500 m — the optimal volume for installing underfloor heating in a house with an area of 150–250 m². The protective EVOH layer prevents oxygen diffusion through the pipe walls and protects the metallic system components from corrosion.

Technical Specifications

Operating Principle in the System

The PE-RT 16×2 pipe is laid in the screed in a serpentine or snail pattern with a spacing of 100–200 mm, forming a closed circuit between the supply and return manifold. The coolant circulates through the pipe at a temperature of 30–45°C — it transfers heat through the screed to the floor and returns to the manifold cooled down. PE-RT (Polyethylene Raised Temperature resistance) is a polyethylene with a modified molecular structure that provides resistance to elevated temperatures without a cross-linking process. The pipe retains flexibility during installation and lies snugly against the insulation, does not spring back and requires no additional fastening during manual installation, although it is more convenient to use tacker staples for an even laying pitch.

Application Scenarios

• Wet screed. Classic installation: insulation → foil film with grid markings → pipe → concrete screed 60–80 mm.
• Dry system (without screed). The pipe is laid in the grooves of heat-distribution plates between joists or in a special underlay — lower structural floor weight.
• Heat pump system. The heat pump delivers coolant at 35°C — the PE-RT pipe operates with a fivefold temperature safety margin, guaranteeing reliability for decades.
• Large house or multiple floors. A 500 m coil covers the needs of a large project without unnecessary joints; number of coils = total length of all circuits ÷ 500.

PE-RT vs. PE-Xa — an honest comparison

PE-Xa (cross-linked polyethylene) has a higher peak service life at temperatures above 70°C and "shape memory" after bending. For an underfloor heating system where the temperature never exceeds 45–50°C and the pressure is 3–4 bar, these PE-Xa advantages do not materialise in practice. The PE-RT 16×2 pipe fully meets the underfloor heating requirements at working conditions of 6 bar / 70°C — with a twofold safety margin — and costs less. The EVOH oxygen-corrosion barrier is present in both types.

Underfloor Heating and Heat Pumps

An air-to-water heat pump generates coolant at 35–45°C — this is precisely the working range of underfloor heating. At these temperatures the COP of the heat pump reaches 4–5: for every kWh of electricity consumed, the system produces 4–5 kWh of heat. Radiators require 60–70°C — the COP drops to 2–3. The PE-RT 16×2 pipe in the screed is the heat-exchange surface that allows the heat pump to realise its full potential. For the selection and design of a heat pump system, visit the Termojet heat pump website.

Frequently Asked Questions

How many metres of pipe are needed per 1 m² of underfloor heating?
At a laying pitch of 150 mm — approximately 6.7 m/m². At 100 mm — 10 m/m², at 200 mm — 5 m/m². Standard formula: circuit length = room area ÷ pitch (in metres) + allowance for connections to the manifold (usually 5–10 m per circuit). A 500 m coil at a 150 mm pitch will cover approximately 65–70 m² of usable floor area, including connection runs. The pipe connects to the manifold via a 16×2 Euro cone.

Does the Termojet PE-RT pipe have an oxygen barrier?
Yes. The pipe is equipped with an EVOH layer — an anti-diffusion barrier that prevents oxygen from the surrounding environment from penetrating through the pipe wall. This protects the steel and cast-iron components of the system (manifold, pump, boiler) from corrosion. View all accessories for system installation in the Termojet underfloor heating system catalogue.