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
Balancing an Underfloor Heating Manifold: Flow-Meter Settings
Cold rooms with the pump running? The full manifold balancing procedure: calculate per-loop flow, purge, set the 0-2.5 L/min meters, avoid actuator…
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Fitting Pressure Ratings (PN16/PN25): Why the Joint Sets the Limit
PN16 vs PN25 fitting pressure ratings: temperature derating, EPDM seal limits, EN 1254, and why the system rating is the weakest joint.…
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Galvanic Corrosion in Plumbing: Mixed-Metal Connections Explained
Galvanic corrosion in plumbing explained for contractors: the galvanic series, copper-to-galvanized failure, dielectric unions vs brass transitions, and DZR grades.
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PPSU vs Brass Push-Fit Fittings: Material Trade-Offs
PPSU vs brass push-fit fittings compared for wholesalers: hydrolysis, DZR grades, UV, stress-cracking, price index and certs. A stocking matrix from Hitze.
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Cold Expansion (F1960) vs Crimp (F1807): PEX Connections Compared
F1960 cold expansion vs F1807 crimp for contractors: verified ASTM scopes, flow-path ID math, tool costs, cold-weather behavior and warranty risk.
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Inside PEX-AL-PEX: Why Butt-Welded Aluminium Layers Matter
Not all multilayer is equal: how a butt-welded aluminium core in PEX AL PEX pipe beats overlap welds on concentricity, oxygen barrier…
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PEX Chlorine Resistance: What F876 CL Ratings Mean
What PEX chlorine resistance really means: ASTM F876 CL1/CL3/CL5 classes, F2023 testing, PPI TR-4 and NSF-pw explained for spec engineers.
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Thermal Expansion in Plastic Pipe: PEX vs Multilayer vs PP-R
Grounded coefficients for pipe thermal expansion: PEX ~0.15-0.20, multilayer ~0.025, PP-R ~0.15 mm/(m·K). Worked 30 m riser at ΔT 40 K, loops…
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PPR Pipe Sizes, SDR & PN Ratings: 20mm to 110mm Spec Guide
PPR pipe size chart 20–110mm: SDR 11/7.4/6 walls per DIN 8077, PN ratings at 20°C vs hot derating, and how to match…
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PEX vs Copper for Potable Water: A Trade Buyer’s Comparison
PEX vs copper for potable water: installed cost, chlorine and freeze behavior, theft risk, code acceptance, recirc limits — a trade buyer's…
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