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Hot Water Plumbing Systems

A. Bhatia, B.E.


Course Outline

This 3-hours online course identifies your hot water needs and outlines the type of systems available. Choosing the most appropriate system for your needs, together with the wise system design & use, can considerably lower your hot water costs.

This course is intended to provide basic information on system design, which may be used for conceptual design in the absence of any more appropriate information. The course is suitable for students, architects, plumbers, engineers and the facility designers.

This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of the course materials.

Learning Objective

At the conclusion of this course, the student will:

Course Introduction

Hot water plumbing systems has a) heat source, b) heat transfer equipment, c) a distribution system and d) terminal hot water usage devices.

Heat source may be a) fuel energy b) solar energy c) electrical energy and/or d) waste heat recovery from flue gases, boiler blow down, air-conditioning systems or process waste discharge.

Distribution system transport the hot water produced by the water heating equipment to plumbing fixtures or space heating equipment.

The course is divided as follows:


Course Content

The course content is in a PDF file Hot Water Plumbing Systems . You need to open or download this document to study this course.


Course Summary

The hot water piping systems shall be designed to be consistent with the requirements of various plumbing codes. Local jurisdiction requirements may vary widely and are also important.

The hot water system may be designed as natural gravity system or recirculation system. ASPE recommends recirculation when the distance from the water heater to the furthest fixture exceeds 100 feet or the time lag for hot water to reach a fixture(s) exceeds 30 seconds. Recirculation systems use pumps to rapidly move water from a water heater to fixtures.

The hot water piping system design incorporates both tree and parallel-piping configurations (sometimes referred to as a manifold system).

Storage water heaters are designed to hold a useful quantity of hot water in a thermally insulated tank ready for use throughout the day. Continuous flow systems heat the amount of hot water on demand.

When deciding on which type of hot water system to buy, you may consider the initial purchase cost but remember you can spend between two and fourteen times the initial purchase cost of that system on running energy costs over its lifetime. Check carefully on the fuel & equipment, system design, energy efficiency and safety considerations.


Related Reading

Sizing Plumbing Water System

The 3-hour course "Sizing Plumbing Water System" provides design criteria for estimating potable water use. This course addresses the residential & non-residential portable water demands.



Once you finish studying the above course content, you need to take a quiz to obtain the PDH credits.

Take a Quiz


DISCLAIMER: The materials contained in the online course are not intended as a representation or warranty on the part of PDHonline.com or any other person/organization named herein. The materials are for general information only. They are not a substitute for competent professional advice. Application of this information to a specific project should be reviewed by a registered professional engineer. Anyone making use of the information set forth herein does so at their own risk and assumes any and all resulting liability arising therefrom.