Frequently asked questions about the Water pipes category
Water pipes — what are they and what are they used for?
Water pipes are polyethylene, PEX-AL-PEX, PVC or metal tubes used to distribute cold and hot water in buildings. Sitypro carries PE pressure pipes (PN12.5), PEX-AL-PEX heating pipes and corrugated installation pipes for internal water supply.
What water pipe sizes are commonly sold and how to choose diameter?
Common sizes include 16 mm (PEX/PE-RT), 20–32 mm for PE pressure pipes and 18x1.2 mm for steel tube. Choose diameter based on water demand and run length: 16–20 mm for fixture feeds, 25–32 mm for main house lines.
Are PND (PE) pipes suitable for cold water supply?
Yes, PE pressure pipes (PE80) at Sitypro are suitable for cold water supply and rated for PN12.5 working pressure. They are flexible, corrosion-resistant and come in rolls of 10–50 m depending on diameter.
How do plastic water pipes differ: PVC, PE and PEX-AL-PEX?
PVC is stiffer and used for drainage and cold-water applications; PE is a flexible pressure pipe for cold water (PN12.5); PEX-AL-PEX has an aluminium layer and is suited for hot water and heating due to thermal stability and shape retention.
Which pipes are suitable for internal water distribution in an apartment?
For internal distribution use PEX-AL-PEX or PE-RT/PEX pipes of 16–20 mm and corrugated protective conduit for finishing. PEX-AL-PEX is suitable for hot water and heating; PE-RT/PEX for cold and mixed systems.
Are heated pipes available in the assortment and how do they work?
The range includes protective conduits and heating cables; heated pipe systems are typically implemented with self-regulating heating cables laid alongside the pipe. Properly installed they prevent freezing at low ambient temperatures.
Do you have PVC water pipes and what are they suitable for?
The range includes PVC components typically used for drainage and cold-water installations. For hot water or pressured systems PEX-AL-PEX or certified PE pipes are recommended.
Which cross-linked polyethylene (PEX/PEX-AL-PEX) pipes in the catalogue are best for heating?
For heating Sitypro recommends PEX-AL-PEX pipes (typically 16–20 mm); the aluminium layer provides shape stability and reduces thermal deformation. Choose diameter per your heating design and hydraulic requirements.
What metal water pipes are in the catalogue and where to use them?
The catalogue includes steel tubes (e.g. TERAS TORU SANHA 18x1.2 3m) — suitable for durable mains, risers and applications requiring high mechanical strength. For flexible internal distribution PEX/PE materials are preferred.
How safe are lead water pipes and are they in the assortment?
Lead pipes are unsafe for drinking water due to lead toxicity and are not present in Sitypro’s modern assortment. Use certified PE, PEX-AL-PEX or PVC materials for potable water.