High-temperature circuits need more than plain PPR. Bekaatherm supplies fiberglass- and aluminum-composite PPR pipe engineered for low thermal expansion, plus matched manifolds, radiator valves and solar sets from one Turkish manufacturer. SKZ / ISO / CE / WRAS certified. Exporting to 118+ countries.
We supply complete heating systems wholesale to integrators, contractors, importers and distributors, not single-item retail installs.
Cold-water plumbing is forgiving. Underfloor heating and solar hot-water circuits are not: water runs hot, temperatures cycle up and down every day, and plain PPR responds by expanding, sagging between clips, stressing fusion joints, and eventually leaking where the customer least wants it: under a finished floor or on a rooftop solar loop. A single failed joint under screed can mean lifting a whole room. On a rooftop solar collector, stagnation temperatures push the return line even harder. The three failures integrators fear most are all avoidable with the right specification, chosen before, not after, the pipe is buried.
The fix is not a heavier pipe or more clips, it is the right composite structure, the right PN pressure class, and a matched system documented against SKZ / ISO / CE / WRAS. That is exactly what this page walks you through.
| The fear on high-temp circuits | Why it happens | How the right system prevents it |
|---|---|---|
| Expansion cracking / sagging | Plain PPR moves too much when hot; repeated heat cycling fatigues the wall | Composite core (fiberglass or aluminum) cuts thermal expansion by a large factor |
| Mismatched, pieced-together parts | Pipe, manifold, valves bought from different sources with different threads and brass grades | One matched PPR system, pipe, fittings, manifold, valves, solar set, same resin family |
| Failing sign-off / customs | Pressure class or certification not proven on paper | PN20/PN25 rating + SKZ / ISO / CE / WRAS documentation on request |
| Oxygen ingress into closed loops | Plain plastic lets oxygen diffuse in, corroding boilers and steel components | Aluminum-composite (PPR-AL-PPR) adds an oxygen barrier for closed heating loops |
Both of our composite PPR pipes are built to cut the thermal expansion that ruins hot circuits, the difference is how. Fiberglass-composite (PPR-FG) knits a reinforcing middle layer into the wall for lower expansion and higher strength while staying all-plastic and light to weld. Aluminum-composite (PPR-AL-PPR) sandwiches an aluminum layer that further limits expansion and adds an oxygen barrier, useful on closed heating loops. We manufacture both in PN20 and PN25, sizes 20–63mm, in our green / white / coffee series, from 100% high-standard raw material.
| Spec | Fiberglass-Composite (PPR-FG) | Aluminum-Composite (PPR-AL-PPR) |
|---|---|---|
| Core layer | Fiber-glass reinforced middle layer | Aluminum layer (PPR-AL-PPR) |
| Thermal expansion | Reduced vs plain PPR | Further reduced |
| Oxygen barrier | , | Yes (closed heating loops) |
| Welding | All-plastic, standard heat fusion, light to weld | Some layers need peeling before fusion, per fitting type |
| Pressure class | PN20 / PN25 | PN20 / PN25 |
| Sizes | 20–63mm | 20–63mm |
| Article no. | BK-13–18 (PN20) · BK-19–24 (PN25) | BK-01–06 (PN20) · BK-07–12 (PN25) |
| Best for | Hot water, radiator & underfloor heating | Underfloor heating & solar, closed loops |
This is the hard data behind the choice. Below is the full outside-diameter × wall-thickness table for our fiberglass-composite and aluminum-composite pipe across the 20–63mm range in both PN20 and PN25. Wall thickness climbs with the pressure class, which is why PN25 is the safer pick for hotter solar and closed-loop circuits. All values are taken from the Bekaatherm product catalogue; per-size temperature/pressure limits are confirmed on the datasheet for your operating conditions.
| OD (mm) | Fiberglass PN20 (OD×wall) | Fiberglass PN25 (OD×wall) | Aluminum-Composite PN20 (OD×wall) | Aluminum-Composite PN25 (OD×wall) |
|---|---|---|---|---|
| 20 | 20×2.8 | 20×3.4 | 20×3.1 | 20×3.4 |
| 25 | 25×3.5 | 25×4.2 | 25×3.3 | 25×4.2 |
| 32 | 32×4.4 | 32×5.4 | 32×4.1 | 32×5.4 |
| 40 | 40×5.5 | 40×6.7 | 40×5.0 | 40×6.7 |
| 50 | 50×6.9 | 50×8.4 | 50×5.5 | 50×8.4 |
| 63 | 63×8.6 | 63×10.5 | 63×7.0 | 63×10.5 |
A quick look at the components that build a heating circuit, composite pipe, brass-core valves, manifold-ready fittings and matched sets, cut on our own tooling in the same resin family and colour.
The second failure on heating projects isn’t the pipe, it’s the parts around it. When the manifold comes from one source, the valves from another, and the pipe from a third, you get mismatched threads, brass quality you can’t vouch for, and no single supplier to hold accountable. Bekaatherm builds the whole circuit as one matched PPR system, same material family, brass inserts where they carry load, cut on our own tooling (10,000 molds).
| Component | Article no. | Configurations / sizes | Role in the circuit |
|---|---|---|---|
| Underfloor manifold (2–5 way) | BK-206–213 | 32/40 × 1/2″F × 2W / 3W / 4W / 5W | Splits supply and return across heating loops |
| Manifold with female thread | BK-214–219 | 32/40 × 1/2″F × 2W–5W | Threaded manifold body for valve/actuator mounting |
| Radiator valve, straight / elbow | BK-257–276 | S/L 20/25 × 1/2–3/4″M | Connects and isolates radiators on the loop |
| Solar and radiator set | BK-281–282 | 25 × 1/2–3/4″ | Matched set for solar hot-water & radiator connections |
| PPR filter (brass nut) | BK-236–241 | 20 · 25 · 32 · 40 · 50 · 63 | Protects the circuit from debris |
| Plug with air valve | BK-254–256 | 25 · 32 · 40 | Bleeds trapped air from the loop |
| Brass double-union ball valve | BK-197–202 | 20 · 25 · 32 · 40 · 50 · 63 | Serviceable isolation with a brass core |
| Hot-melt welding machine | BK-222 | 20–63mm | On-site heat fusion of the composite pipe |
Full article ranges, weights, packing and price: available on request. Larger loop counts and custom manifold builds: on request.
Tell us the job and we match the composite pipe, pressure class and matched parts to it, so the circuit is specified, not guessed, before a single meter ships.
Underfloor heating, radiators or solar hot-water, plus your operating conditions and target market.
Fiberglass (PPR-FG) or aluminum-composite (PPR-AL-PPR), we advise by circuit and closed-loop needs.
PN20 or PN25, 20–63mm, matched to loop pressure and temperature margin.
Manifold sized to your loop count, radiator valves and solar set, same material family, brass inserts.
SKZ / ISO / CE / WRAS documentation and pricing for your quantity, market and timeline.
The same composite backbone and matched parts cover the full spread of heating and hot-water work. Whichever circuit you’re building, the pipe, PN class and connections come from one family, so specification stays consistent from the manifold cabinet to the rooftop collector.
Low-expansion composite pipe stays put under screed, feeding a 2–5 way manifold sized to the room count. Fiberglass or aluminum-composite, PN20/PN25.
Rooftop collector loops see high return temperatures. Aluminum-composite with its oxygen barrier and PN25 margin, plus a matched solar-and-radiator set.
Straight and elbow radiator valves (20/25mm) and threaded fittings connect the loop cleanly, brass inserts where the load and heat sit.
On a heating or solar project, “trust me” doesn’t pass sign-off. We treat pressure and certification as documented specs, not claims. Every composite pipe is manufactured to a PN pressure class, PN20 or PN25, with PN25 carrying more margin for hotter circuits, from 100% high-standard raw material. The system carries the certifications importers and inspectors ask for, and SKZ oversight covers both the product and the production line behind it.
| Proof point | What it covers | For your project |
|---|---|---|
| PN20 / PN25 | Pressure class, 20–63mm | Match rating to loop pressure & temperature |
| SKZ (Germany) | Product quality + production oversight (industry’s strictest, per our catalogue) | Premium quality assurance |
| ISO TYPE-5 | Quality system | Consistent, audited process |
| CE | European conformity | Customs clearance & project sign-off |
| WRAS | Potable-water safety | Clean-water compliance |
Certificate numbers: available on request. Test reports for your project’s operating conditions: on request.
A great pipe that can’t reach your market is no help. Bekaatherm has 30 years of manufacturing behind the range, a 120,000 m² plant, 1,000+ staff and an international export team that ships to 118+ countries, with the CE/SKZ/WRAS documentation that keeps composite heating pipe moving through customs from the Gulf to East Africa to Eastern Europe. Whether you’re specifying underfloor heating in the UAE, Saudi Arabia or India, or stocking solar hot-water pipe for a regional market, the system is export-ready.
Spec the right composite pipe for each circuit and order the manifold, radiator valves and solar set matched to it. One system, one point of accountability, no more chasing threads that don’t fit.
Valves & ManifoldsPN-rated pipe, batch consistency, and the technical file your inspector wants, from PN20/PN25 composite pipe to matched parts, delivered on your schedule.
Projects & ContractorsThe complete heating range under your brand, OEM fully supported, with regional exclusivity available. Low MOQ, one supplier for pipe, fittings, valves and sets.
OEM & Private LabelFor the Integrator: Use a composite PPR pipe, not plain PPR. Fiberglass (PPR-FG) or aluminum-composite (PPR-AL-PPR) cut thermal expansion so hot loops don’t sag or stress joints. Both come in PN20 and PN25, 20–63mm. Aluminum-composite also adds an oxygen barrier for closed heating loops.
For the Project Buyer: Yes. Underfloor-heating manifolds (2–5 way, BK-206–219), radiator valves (straight/elbow, BK-257–276) and solar-and-radiator sets (BK-281–282) are matched to the same PPR system, same material family, brass inserts, one supplier. You size the manifold to your loop count; exact configurations are on request.
For the Contractor: Composite PPR is rated for continuous hot-water service, classed as PN20 or PN25, PN25 gives more margin on hotter circuits. As a reference, PN20 ≈ 20 bar and PN25 ≈ 25 bar at 20°C. Exact temperature/pressure limits per size are in the datasheet; request the spec sheet with your operating conditions and we’ll confirm the right class.
For the Integrator: Underfloor-heating manifolds come in 2-way, 3-way, 4-way and 5-way outlets on 32mm and 40mm bodies with 1/2″ female connections (BK-206–213), plus a female-threaded version (BK-214–219). Size the manifold to the loops on each floor; larger or custom loop counts are available on request.
For the Contractor: Both cut expansion. Choose fiberglass (PPR-FG) for radiator and underfloor heating where all-plastic, easy heat fusion matters. Choose aluminum-composite (PPR-AL-PPR) for closed loops and solar, where the oxygen barrier and the lowest expansion count. Both are PN20/PN25, 20–63mm; see the dimensions table above.
For the Importer: Yes, SKZ (Germany), ISO TYPE-5, CE and WRAS. WRAS supports potable-water safety; CE/SKZ help customs clearance and project sign-off across the 118+ countries we export to. Certificate numbers are available on request.
For the OEM Brand: Yes, OEM is fully supported (your colors, logo, packaging) and regional exclusivity is available. With 10,000 molds and a 120,000 m² plant we back your brand with consistent quality. MOQ, lead time and pricing are available on request.
This heating solution pulls together several product lines and guides. Compare the two composite pipes, go into the fittings and manifolds it uses, and read the head-to-head guides that back the specification choices on this page.
Tell us your application (underfloor heating, radiators, solar hot-water), pipe type (fiberglass or aluminum-composite), sizes and PN class, quantity, target market and timeline. Our export team will come back with specs, certifications and pricing.
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