In residential scenarios where hot water is essential (e.g., showers, kitchen sinks, washing machines), the heat resistance of PP pipes becomes a critical advantage, directly addressing the core demands of stable, safe, and long-lasting hot water supply. Its heat-resistant properties bring multiple benefits tailored to hot water conveyance

First, wide temperature adaptability meets daily hot water needs. PP pipes have a continuous use temperature range of -20°C to 120°C, while the typical hot water temperature in homes (40–60°C) falls well within this range. Unlike some plastic pipes (such as ordinary PVC pipes) that soften, deform, or even melt when exposed to temperatures above 60°C, PP pipes maintain their original shape and structural integrity. This means they can stably convey hot water from water heaters to various household outlets—whether it’s the high-temperature water needed for washing dishes or the moderate-temperature water for showers—without being damaged by routine hot water use, ensuring uninterrupted hot water supply.​

Second, no deformation ensures consistent water flow. When conveying hot water, pipes are prone to thermal expansion and contraction. PP pipes have a low coefficient of thermal expansion compared to other common hot water pipes. This low expansion rate means they only undergo minimal dimensional changes even when switching between cold water (e.g., tap water input) and hot water (e.g., 60°C output from water heaters). There is no excessive expansion that could cause pipe bending, kinking, or blockage of the water flow channel. For residents, this translates to stable water pressure and consistent water flow when using hot water—avoiding the problem of reduced water flow or sudden pressure changes caused by pipe deformation.​

Third, heat resistance prevents material degradation and ensures water safety. When pipes are exposed to long-term hot water, poor heat resistance can lead to material aging, decomposition, or the leaching of harmful additives into the water. However, PP pipes are made of stable polypropylene molecules, and their chemical structure remains unchanged under the typical hot water temperatures of homes. They do not release plasticizers, heavy metals, or other toxic substances into the hot water—even after years of continuous use. This compliance with food-grade standards (e.g., FDA certification) is crucial for hot water safety: residents can safely use the hot water for cooking (e.g., boiling water) or personal hygiene (e.g., bathing) without worrying about water contamination from pipe degradation.​

Fourth, compatibility with hot water system components reduces installation troubles. Residential hot water supply systems often include water heaters (electric, gas, or solar), check valves, and faucets—all of which operate under hot water conditions. The heat resistance of PP pipes allows them to be seamlessly connected to these components using heat fusion technology. The heat fusion joint not only maintains stability under hot water temperatures (unlike some adhesive joints that may fail due to heat) but also forms a leak-proof seal. This avoids the risk of leaks at the joints— a common problem with pipes that have poor heat resistance, which can lead to water damage to walls, floors, or furniture in homes.​

Finally, long service life under hot water conditions cuts maintenance costs. Hot water accelerates the aging of many pipe materials: metal pipes (e.g., copper) may develop scale or corrosion faster when in contact with hot water, while low-quality plastic pipes may become brittle and crack. PP pipes, however, resist aging and corrosion even in long-term hot water environments, with a service life of up to 50 years. This means homeowners do not need to frequently replace pipes due to hot water-induced damage, reducing the high costs of maintenance, repair, and renovation (such as breaking walls to replace old pipes) and saving time and effort in the long run.