Hot water supply
in building

Domestic Hot Water Supply

• Sanitation standards required hotels, restaurants and other similar establishments to provide hot water facilities. Today, even the humblest small dwellings are enjoying this type of convenience for human comfort.

2 Types of Hot Water Distribution:

• The Up-Feed Gravity Return System
• The Overhead Feed and Gravity Return System

v  The Up-Feed Gravity Return System

It is used in small residential houses and other industrial installations with the following features:

1. It provides constant circulation of hot water.
2. Hot water is quickly drawn from the fixtures at any time desired.
3. Provide economical circulating return of unused hot water
4. Eliminate waste of water

Construction of the Up-Feed Gravity Return System

• The heating unit and the storage tank are placed below the distribution pipeline.
• The heating unit should be near accessible to the pipe system.
• The distribution main pipe is suspended from the ceiling of  the basement.

• The distribution main pipe is connected to the tapping on top of the storage tank.
• The flow riser is provided with a drip and its base for draining

v  The Overhead Feed and Gravity Return System

§  The distribution pipe is connected to the top of the riser.

• The horizontal runs of the riser should be short, direct and equal in length as possible.
• The horizontal riser branch is connected to the main distribution pipe.
• The horizontal riser branch is equipped with a valve installed closer to the main.

• The Overhead Feed and Gravity Return SystemIs an efficient type of hot water distribution.
• The operating principles are as follows:
• 1. Water distribution is dependent on the expansion of hot water and gravity.

§  2. That water will circulate, even if there may be defect in the mechanical construction

Construction of the Overhead Feed and Gravity Return System

§  The storage heating unit is placed at the lowest point of the distribution pipe.

• The overhead feed is connected to a tapping fitting located on top of the storage tank.
•  As much as possible, the riser should be extended direct and free from offsets.
• The distribution pipe is connected to the top of the riser.
• The riser is extended downward through the different  storey of the building where the lavatories, shower bath and like are connected.
• The gate valve and a drip are connected at the base.