How Water Heaters Came into Being

Traditionally, before water heaters were invented, people used to store water in containers and heat them on fire placed on woods, whether they wanted to use water for bathing or cooking purposes. Today, the scenario is different.

The real inventor of water heaters is not known, however, it is popularly believed to be the invention of the Romans— dating back to 306 AD. The struggle of moving large containers of water to boil and use was tough. Therefore, the invention of water heater is seen as a breakthrough equipment in human history.

water heater

Water heaters: Timeline

The Romans

It is believed that Romans were the first one to design large baths with hot water. However, these were not made individually in the form of a water heater, but are essentially known to be the first step towards the process.

The 1860’s

After many centuries, the second half of the 18th century saw major advances in water heating in the works of Benjamin Waddy, an English painter. He was the first one to patent the water heater. The Gas Gyser (water heating system) was first introduced by him. It was not safe to use initially as it was not equipped with a vent. This water heating appliance was used to heat water in tubs.


This was the era of Edmund Rudd. He upgraded the initial idea used by Waddy. His design was more popular as it involved safety features and developed into a modern water heater, known as the instantaneous water heaters.

These were not equipped with a tank and were far more efficient and superior than previous water heating styles. This kind of water heater is also referred to as an ‘in-line’ water heater, because it only heated water that passed through the equipment. Hence—saving energy, as extra water is not heated all day long.

1890- till date

During the past two centuries, many modern day water-heating devices have been developed. Many manufacturers are turning towards the idea of innovation and efficiency. Today, water heaters are available to store and heat large amount of water with little amount of energy, unlike in the past.

According to this source one of the most common types of water heating device in the modern world is the solar water heater. If you are living in an area with abundance of sunshine, then this is the most cost efficient water heating appliance to use. These are generally installed on the exterior, such as on the roof to help absorb energy from the sun. At nighttime, solar water heaters make use of sensors (automatic) to keep the water heated.

Additionally, in winters you can make use of solar water heaters (Evacuated Tube Solar Collectors) that work efficiently in winter as it contains heat operated poles.


Humidifiers are devices that supply moisture (steam) to the air in order to prevent dryness. It has however been researched that while humidifiers have lots of benefits such as helping to relieve dry skin, cracking lips, dry nose and much more, it can also have a negative impact on an individual’s health if it is too high. A high level of humidity can lead to or worsen respiratory problems. Humidifiers usually come in various sizes, such as portable or personal size and console size.

The portable size, as the name implies is actually the smallest unit of a humidifier and often regarded as the best option for a traveler. The console size, on the other hand, is large and has a wheel attached to it which can be moved from one place to another. It is often used to steam or moisturize the entire house.

While humidifiers come in various sizes, it is very much interesting to know that there are various types as well, of which the steam, ultrasonic and evaporative humidifiers are the three major types, while other types are the central humidifiers and impeller humidifiers. Choosing a humidifier that will suit an individual needs depends on a certain number of factors, some of which include:


Steam humidifier is also known as a vaporizer or a warm mist humidifier. It is often referred to as an ideal humidifier for people suffering from a respiratory disorder. It is a humidifier that works with electricity as it cools water after heating it before discharging it to the air. This type of humidifier emits clean moisture into the air due to the water heating process which kills all forms of germ and it is less expensive and portable. However, a steam humidifier that has a humidistat might actually cost a little more than one without a humidistat.

The purpose of the humidistat is to help control humidity by either increasing or decreasing the heat that is creating the steam and it does that based on the environment current level of humidity. The major weakness attributed to a steam humidifier falls in the area of its energy consumption, as it consumes more energy than other types of humidifier.

Asides its energy consumption rate, it also carries a high risk of burns. It should, however, be noted that when a steam humidifier is not in use, the water in it should be drained out and the humidifier should be cleaned and properly dried. Likewise, the whitish substance known as a lime scale usually caused by the effect of heat on water should be cleaned and taken out of the humidifier from time to time.


Evaporative humidifier is also known as a wick or cool mist humidifier and it is referred to as the most common handy or portable humidifier among others. Unlike the steam humidifier, this type of humidifier consumes lesser energy. Water is emitted into the air through the evaporation of moisture. Once evaporation occurs, it retains any particles back in the humidifier and discharges the cleaner part of the water into the air giving room for a hygienic environment. Despite this great advantage of restricting particles from going into the air, this restriction requires regular replacement of the filter to prevent it from smelling, as the retained particles by the humidifier stores in the filter.


One of the disadvantages of an evaporative humidifier is that it does not multitask, that is, it has been designed to work only in one place at a time and it may sometimes discharge excess moisture into the air which could be a problem for asthmatic patients. The Everlasting Comfort Ultrasonic Humidifier: For All Seasons is often regarded as the best humidifier for children. Sometimes referred to as a spray humidifier, it is known as the most affordable type of humidifier among others and requires little energy to operate as well as little maintenance. This type of humidifier has both cool and warm mist.

The ultrasonic humidifier consists of a water reservoir and a vibrating plate. The pressure of the vibrating plate allows the water to break into smaller units, which is then blown out of the vent into the room with the aid of a fan in the humidifier.

Central Humidifier

A major disadvantage of this type of humidifier is that, it releases dust into the air which eventually settles in the room making the environment less clean and hygienic and thus creating complications for a person with a respiratory problem.T his type of humidifier is more expensive than every other type of humidifier. It is usually constructed directly inside the air conditioning appliance of one’s home and it spreads humidity to the whole house.

Impeller Humidifier: 

This type of humidifier has no prospect of burns attached to it and thus among one of the humidifiers that is safe for children. It uses a rotating disc which operates at a high rate to throw fine drops of water into the air. The impeller generates a louder noise than other types of humidifiers discussed above.