Things You Didn’t Know About Hot and Cold Water Supply Systems

Recirculation and gravity system

This type of system can be found in many commercial buildings. The cold water is brought into the building via a rising main. Once inside, it is stored in an intermediary tank.

The cold water is pumped from the tank via gravity to the points of usage without any recirculation. Coldwater is drawn from the storage tank into the calorifier, a hot water cylinder. It is then heated (electrically or via a boiler/heat exchanger). A continuous flow of hot water flows from the calorifier/cylinder to the calorifier and back to it.

This ensures hot water can be quickly accessed at any tap, regardless of its distance from the calorifier.

The circulation pump has been designed to ensure that the return water temperature to the calorifier does not fall below 50°C.

Without recirculation, the gravity system

This system can be found in many houses and small buildings. It does not have a hot-water loop and recirculating pump but is very similar to the above system.

The cold water may be drawn from the mains, or it may be fed directly by gravity from the cold storage tanks.

Mains pressure (closed) systems

Coldwater is directly fed from the mains. It’s heated and then delivered to the point where it is needed. A safety valve and an expansion vessel are needed because water will expand when heated. Both pressurized and recirculation systems can use a hot-water distribution from pressurized systems.

These systems are often found in combination (combi), boiler-equipped houses.

Heat banks are becoming more familiar with the rise in green technologies. These heat banks store a volume heated using solar, ground-source, wind, or other methods. The heat bank receives mains water, which is heated immediately upon demand.

The heats bank liquid can be used to heat the central heating system.

The risk of Legionella in the mains pressure system is decreased because there is no water storage to which people are regularly exposed.


Mains pressure systems can remove some of the Legionella risk factors present in gravity hot water systems.

This requires confidence in the reliability of the mains supply and may not work in all cases.

Point of use water heaters with minimal storage can solve problems like maintaining hot water temperature throughout distribution systems and responding to changes in demand.

Always contact specialists like αποφραξεις περιστερι, don’t act on your own because these systems are kind of complicated

Different Types of Drainage Pipes

For wastewater to be disposed of from our homes and in industrial areas, drain pipes are needed. There are several types of drainage pipes that can be used for various purposes.

A drainage pipe is a pipe that allows water to be transferred from one place into another.

They are essential as they perform the most important task of disposing of water from houses and industries. They are essential for preventing flooding caused by soil erosion and swamp-like conditions.

Different drainage pipes can be used for different drainage issues. PVC and polyethylene drainage pipes are today the most popular drainage pipes. Other than these, there are other pipes that can manipulate the flow and control wastewater.

Drainage pipes made of corrugated polyethylene

For drainage systems that require strong and durable pipes, corrugated drainage pipes can be a cost-effective solution. Polyethene, a chemically inert material, is resistant to abrasion and is highly corrosive. Resilient to extreme weather conditions and harsh environments. About 90% of drainage pipes are made from corrugated polyethylene.

PVC Drainage Pipes

Because they are durable, inexpensive, and easy to assemble, polyvinyl chloride pipe is popular for drainage systems. About 75% of the wastewater mains are made up of PVC pipes. These pipes can withstand any pressure, only requiring glue to join two pieces together. This saves time and doesn’t require soldering or welding. These PVC pipes have one drawback: they cannot be bent to any desired shape.

Concrete Drainage Pipes

Concrete pipes are easy to install as they are used most often in construction material. Concrete pipes are the most popular choice for drainage because of their strength, durability, cost-effectiveness, and availability in local areas. These pipes are also widely used due to their eco-friendly nature, non-flammable properties, and low cost.

Clay Drainage Pipes

Clay drainage pipes are also more eco-friendly and more substantial than plastic. These pipes are durable and environmentally friendly, but they have to be replaced every few years as cracks develop from extreme weather and high water pressure. The clay pipework has been covered with concrete to make it more rigid and durable.

Cast Iron Drainage Pipes

Cast iron pipes are used for home sewage applications. They are installed below ground to allow water to flow through them and the purification center to be recycled. They are well-known for their toughness and durability. These pipes are popular because they can be installed and forgotten about by municipalities. It is easy to maintain and repair and can last more than 100 years.

Copper Drainage Pipes

Copper pipes were once widely used to supply water and drainage lines in residential homes. These pipes are now being replaced with PVC or plastic because copper is expensive and tends to rust over time. These pipelines are not able to withstand cold temperatures and can burst if water freezes. They are therefore rarely used in drainage systems.

Galvanized Drainage pipes

In the early 1900s, galvanized pipes were widely used as drains. Because they were inexpensive and readily available, they were prevalent. These pipes were soon replaced by plastic or PVC pipes due to leakage, high maintenance, and discoloration problems. These pipes are rarely used for drainage purposes.

Each drainage pipe is unique. Before you buy a drainage pipe for your home, consult a professional.

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