HDPE pipe is a primary alternative to PVC (polyvinyl chloride) pipe for all piping applications. Unlike PVC, HDPE piping does not contain know contaminants such as chlorine and dioxins, it also has a much higher recycling rate.
The delivery of hot water comes at a high price, as gas water heating accounts for about 16 percent of the average California home utility bill, and electric water heating about 28 percent. Read this fact sheet to learn how different water heating options compare in cost, performance, and energy efficiency:
A general overview of tankless water heaters including a discussion of their application in green building, how to select appropriate models, and cost.