Which type of insulation is commonly used for hot water pipes?

Fiberglass or foam insulation is commonly used for hot water pipes due to its excellent thermal resistance properties and its ability to effectively reduce heat loss. This type of insulation helps maintain the temperature of the water inside the pipes, ensuring that hot water is delivered quickly and reduces energy costs associated with heating the water. Fiberglass insulation is lightweight, easy to install, and can be found in various thicknesses to accommodate different pipe sizes.

Foam insulation, on the other hand, provides a high R-value (a measure of insulation's effectiveness) and is often used in both residential and commercial settings. Additionally, foam insulation can conform tightly around the pipes, minimizing heat transfer more effectively than other materials might. Its use is particularly beneficial in areas where condensation could form, as it minimizes moisture buildup.

While other materials like bubble wrap or polystyrene may offer some insulation qualities, they are not commonly recognized as effective long-term solutions for hot water pipes. Mineral wool, while a good insulator, is typically not used for hot water pipe insulation due to its density and moisture absorption characteristics. Hence, fiberglass or foam insulation stands out as the preferred choice for this application.