Hitze Insights
Piping & Heating Technical Guides
Specification, certification and sourcing guides for wholesalers, contractors and private-label brands — written from the Hitze engineering desk.
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Latest technical guides
Virgin vs Recycled PPR Pipe Material: What Buyers Can Verify
The ISO 15874 clause that governs recycled content, the melt flow rate limits that expose blending, and the four documents to request…
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PPR Fittings List to BOQ: Counting Pipe, Fittings and Waste
PPR fittings list to BOQ: the NRM2 rule on whether fittings are priced at all, the four count triggers, fusion-depth pipe loss,…
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PPR Pipe vs PEX: What to Specify for Hot Water
PPR pipe vs PEX judged on the same ISO 10508 service class, not brochure numbers — the PEX code digit and PP-R…
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PPR Pipe Support Spacing & Thermal Expansion for Hot Runs
PPR pipe support spacing by pipe size and wall temperature, the vertical 1.2 correction, and expansion-loop sizing worked from real manufacturer tables.
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PPR Pipe Pressure Test: Correct Pressure, Duration, Record
Test PP-R at 1.1x design pressure, not 1.5x its PN class. EN 806-4 procedures, why the gauge falls without a leak, and…
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PPR Pipe Flow Rate Chart: Size a Line Without Losing Pressure
PP-R flow rate chart from ISO 15874-2 Table 5 bores: pressure drop per metre and EN 806-3 velocity limits, for specifiers sizing…
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PPR Fusion Failures: What Joint Evidence Can Tell You
Inspect PP-R socket failures: assess colour and leak timing carefully, verify manufacturer parameters and record the approved re-test method.
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PPR Pipe Advantages and Disadvantages: The Limits, With Numbers
A distributor calls because a hotel job has started weeping at the fittings on the top two floors. The pipe is PP-R,…
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PEX Pipe-in-Pipe Relining: Sizing, Clearance and When It Beats Repiping
Pex pipe in pipe relining pulls a smaller PEX tube through an existing host pipe and terminates it at both ends. The…
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Flexible Hot Water Pipe Options For Plumbing Systems
Table of Contents Why Flexible Hot Water Pipes Matter in Modern Plumbing PEX (Cross-Linked Polyethylene) Hot Water Pipes PPR (Polypropylene Random Copolymer)…
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