{"id":10201,"date":"2026-07-31T14:52:44","date_gmt":"2026-07-31T14:52:44","guid":{"rendered":"https:\/\/ifanultra.com\/ppr-pipe-for-hot-water.html"},"modified":"2026-07-31T14:52:44","modified_gmt":"2026-07-31T14:52:44","slug":"ppr-pipe-for-hot-water","status":"publish","type":"post","link":"https:\/\/ifanultra.com\/pt\/ppr-pipe-for-hot-water.html","title":{"rendered":"PPR Pipe for Hot Water: Which Class You Must Specify"},"content":{"rendered":"

Nearly every spec sheet for PPR pipe for hot water carries the same number: 95°C. It appears on catalogue pages, on supplier blogs, and in the WhatsApp message your factory contact sends when you ask whether the pipe will handle a hot line. The number is real.<\/p>\n\n

It is also the most misread figure in the category, because 95°C is not a service temperature. In ISO 10508:2006<\/a> it is T<\/em>mal<\/sub>, the malfunction temperature, allowed 100 hours across a 50-year design life — roughly two hours a year of thermostat failure. It is what the pipe survives, not what it runs.<\/p>\n\n

The temperature the pipe actually runs at continuously is T<\/em>D<\/sub>, and for hot-water supply that is either 60°C for 49 years (Class 1) or 70°C for 49 years (Class 2). Choosing between those two classes — and then choosing the wall thickness that satisfies the one you picked at your own working pressure — is the entire hot-water buying decision. Everything else on the datasheet is downstream of it.<\/p>\n\n

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