PE-Xa vs PE-RT vs Multilayer Pipe: How to Choose the Right Pipe

　　Three families, one decision Ritable manufactures three piping families for hydronic and plumbing systems: PE-Xa Series Pipe, PE-RT Series Pipe and Multilayer Series Pipe. All three are corrosion-free, flexible and long-lasting — but they are engineered for different jobs. This guide explains the differences so you can specify the right one the first time.

　　1. PE-Xa — the performance benchmark PE-Xa is produced by the Engel peroxide method, which creates a homogeneous molecular structure across the pipe wall. Because the cross-linking is uniform (not concentrated at the surface as with PEX-b or PEX-c), PE-Xa delivers the most stable long-term properties of the three PEX types and the highest resistance to temperature and pressure cycling.

　　Best for: underfloor heating, radiator circuits, hot and cold potable water, district heating, industrial and commercial projects

　　Why specify it: shape memory supports cold-expansion connections; proven in large public projects; manufactured at scale — Ritable's PE-Xa lines have run since 2001 with 40+ million metres per year

　　Variants: PE-Xa Pipe with EVOH Layer for oxygen-barrier circuits; PE-Xa/AL/PE-RT Pipe for shape-retaining runs

　　2. PE-RT — the cost-effective workhorse PE-RT (raised-temperature polyethylene) needs no cross-linking, so it is simpler to produce and more economical per metre. It is flexible and corrosion-resistant, and is the default choice for large, straightforward radiant floors where the highest thermal rating is not required.

　　Best for: residential underfloor heating, large-area circuits, cold water plumbing

　　Why specify it: lower material cost for comparable service life in heating applications; easy to handle on site

　　Variants: PE-RT Pipe; PE-RT Pipe with EVOH Layer for oxygen-tight systems

　　3. Multilayer — the shape-keeper Multilayer pipe bonds a welded aluminium core between inner and outer polymer layers. The aluminium core gives it something the other two cannot offer: it holds the bend. That eliminates the need for clips on many runs and makes neat, straight pipe routing possible.

　　Best for: visible plumbing runs, radiator connections, renovation work, systems where pipe must hold its shape

　　Why specify it: bend retention, full oxygen tightness from the aluminium layer, low thermal expansion

　　Variants: PEX-Al-PEX Pipe; PERT-AL-PERT Pipe

　　4. Head-to-head

　　5. Choosing by application

　　Large radiant floor, cost-driven → PE-RT

　　Radiant floor with oxygen-tight requirement → PE-RT/EVOH or PE-Xa/EVOH

　　High-temperature, high-cycling or public/commercial project → PE-Xa

　　Exposed plumbing that must look straight → Multilayer

　　A single project can mix all three: PE-Xa on the main risers, PE-RT on the floor circuits, Multilayer on the visible connections.

　　Not sure which pipe fits your project? Ritable's engineers will review your drawings and recommend the specification.