How to choose a water heater

What is a water heater and how does it work?

A water heater is a device that heats up domestic water. It sounds simple, but it does the job. This simple-looking device heats cold water from the mains whenever you need it. This water can also be used for cleaning and cooking. It is important to note that any water unit that gets water from the mains must comply with water supply regulations. Alpha Tradesmen Academy is different from other Online Plumbing Trade School in that it combines online lessons with practical experience in the field to offer a comprehensive technical education.

What is the Difference between Water Heaters and Boilers?

We now know the basics of a water heater. Let’s see how water heaters and boilers differ.

Water heaters deliver hot water from a tank to the taps or directly to them, depending on which technology is used.

Boilers convert water into steam, which makes it easier to heat the house. Vapour is lighter than water, and it takes less effort to push the pipe to the radiators. Steam is also used for heating water for domestic use. Be aware. Water is not always potable.

Although the exterior of this cylindrical appliance appears simple, the inside is complex and difficult for those with little experience. Every water heater has a heating element that is powered by electricity or fuel. The type of fuel used can vary depending on the model. Before we get to the fuel types and models, let’s first discuss the differences between a boiler and a water heater.

Size and capacity

You should take into account the technology and type of water heater you are using when sizing your water heater. You will need to determine the number of hot water-using appliances and taps in order to choose the right size on-demand water heater. Consider the maximum flow rate and temperature rise of your appliances.


Water heaters come in a variety of sizes. But, they also vary by the fuel they use. Water heaters can run on oil, gas, liquid petroleum gas, or electricity depending on their model.

Gas water heaters are generally less expensive than electric ones. However, you will need to book an inspection for a gas safe certificate.


A water heater’s efficiency is the amount of fuel it uses. This is calculated by the heat produced per unit fuel used over a 24-hour period. All modern units must comply with the common efficiency ratings that have been approved by government.

Outages and power

The electric units will shut down instantly if there is a power cut. You will lose hot water until you restore power. You can connect your water heater with a backup power supply as an alternative.

Gas water heaters do not require electricity. Gas powers the flame or coil, which makes them able to function even in power outages.


Heating appliances are a large investment that can involve many variables. Price of water heater units varies depending on brand, type and size.

You should also consider the cost of the fuel used to power your appliance. You might find that some fuels are more cost-effective than others if you compare them. You should also consider the cost of installation and any extra building work required to install a water heater.