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Choosing The Right Hot Water System Size

Hot water systems come in various sizes to suit different homes and families. The size of your hot water system will affect the amount of water it can store and heat and the number of people it can comfortably supply with hot water. Hot water systems are typically measured in litres, so the bigger the system, the more water it can store.

An average size hot water system is around 250 litres, but it can range from 160 to 400 litres. If there is high demand for hot water in your home, you may need a more extensive system. You can also get smaller systems designed for one or two people.

Components Of A Hot Water System

Water heater

The water heater is the critical component of a hot water system. It heats the water and stores it for use. A gas water heater has a pilot light that ignites the burner. An electric water heater will have heating elements that heat the water. Moreover, both water heaters will have an insulation layer to keep the heat in.

Storage tank

The storage tank is where the hot water is stored until it is needed. It is usually made of steel or another durable material. The size of the storage tank depends on the household size and the amount of hot water used. Storage tanks can be vertical or horizontal.

Hot water pipes

The hot water pipes carry the hot water from the storage tank to the fixtures in the home. The sizes depend on the amount of hot water used and the distance the water travels. Sometimes, the hot water pipes have insulations to keep the heat in.


The fixtures are the devices that use hot water. They have valves that control the flow of hot water. These fixtures include sinks, showers, and tubs; some have thermostats that control the temperature of the water.

Pressure relief valve

This is a safety device installed on all hot water systems. It releases pressure if it gets too high. This prevents the system from exploding and causing damage to the home. The pressure relief valve is usually located near the water heater.


This regulates the temperatures of the water in the system. It is situated near the base of the storage tank. The thermostat is usually adjustable, so you can heat the water to your desired temperature. Once the water reaches the desired temperature, the thermostat will turn off the heating elements or pilot light.

Understanding how the systems work can help you choose the right one for your home. If you're unsure which water system is right for you, talk to a plumber to help you make the best decision.

Choosing The Size Of Your Hot Water System

You may be wondering how much hot water you need. It has a lot to do with personal preference and household size. Laundry, cooking, dishes, baths, and showers use hot water, so it's essential to choose a system that can accommodate your needs. Below are the factors to keep in mind when making your decision on the right size hot water system for you.

Peak demand period

This is the time of day when everyone in your household is likely to be using hot water at the same time. If there are many people using the hot water or if everyone takes showers in the morning, your peak demand period will be higher than if you have a smaller family or if everyone takes showers at different times.

Hot water usage habits

How often do you use hot water each day? If you only take quick showers, you won't need as much hot water as someone who takes long showers or baths. You should also consider whether anyone in your household uses a lot of hot water for things like washing dishes.

Type of home

Do you live in a single-family home, an apartment, or a mobile home? The type of home you live in will affect how much hot water you use. If you live in a larger home, you'll likely use more hot water than someone who lives in a smaller one. And if you have multiple people living in your home, you'll use even more.


Your climate will also affect how much hot water you use. If it's cold where you live, you'll probably take more hot showers and baths to stay warm. This means you'll need a more extensive hot water system than someone who lives in a warmer climate. It would be wise to add about 20 gallons (75.71 L) of capacity for each person in your household if you live in a cold environment.

Water heater location

Where is your water heater located? If it's in the basement, you'll likely have to heat the water longer to get it to the upper floors of your home. This means you'll need a more extensive hot water system than someone with a water heater on the main floor.

Recovery rate

The recovery rate is how quickly your water heater can heat a full tank of cold water. A higher recovery rate means you can get hot water faster, so you won't need as large of a system. But recovery rates are usually only an issue for larger households.

Energy efficiency

More efficient hot water heaters will use less energy to heat the same amount of water. So, if you fancy a more environmentally friendly option, you should choose a more efficient model. But keep in mind that these models usually cost more upfront.


Of course, one of the most important factors to consider is cost. Water heaters can range in price from around $100 to $1000. The size and efficiency of the unit will affect the price and any special features it has. You'll need to factor in installation and annual maintenance costs. Choose the best option for your budget and needs.

Anode rod

Most water heaters have anode rods that need replacement every few years. This is a small rod made of metal that helps to protect the inside of your water heater from corrosion. Replacing an anode rod is a simple and inexpensive task that you can do yourself. But if you're not comfortable doing it, you can hire a plumber to do it for you.

Once you know the factors to consider when choosing a hot water system, you can make the best decision for your needs. Consult with an expert if you're not sure which size or type of water heater is right for you. They can help you choose the perfect system for your home and family.

Installing A New Hot Water System

Once you've chosen the right size of system and tank for your home, it's time to install it. This guide shows you the process step-by-step, so you can get hot water flowing again as soon as possible.

Turn off the power source and water supply

Before starting any work on your hot water system, it's vital to ensure the power is turned off. It will help to prevent any accidents or injuries during the installation process. You should also turn off the water supply to your home and drain the tank to get rid of any water left inside.

Remove the old system

Once you turn off the power and water, you can remove your old hot water system. Start by disconnecting any pipes or wires that are connected to it. Then, use a wrench to loosen the bolts that hold the system in place. Once the bolts are loose, you should be able to lift the old system out of its location.

Prepare the new system for installation

Before installing your new hot water system, you need to ensure that it's properly prepared. Start by reading the instructions that came with your new system. It will guide you on how to approach installations correctly. Next, you'll need to gather the necessary tools and supplies. Ensure you have whatever you need before you begin the installation process.

Install the new system

Begin by attaching the new system to the existing plumbing in your home. Once the system is connected correctly, you can turn on the water supply and fill up the tank. Next, connect the electrical wires to the system and turn on the power. Finally, test your new system to make sure it's working correctly.

Insulate the pipes

Once you've installed the new hot water system, insulating the pipes is essential. This will help to keep the heat from leaking out and prevent your energy bills from going up. You can purchase pipe insulation at most hardware stores.

Bleed the air out of the system

After you've installed and insulated your new hot water system, you need to bleed the air out of the system. Turn on your water supply and open a hot water faucet in your home. Let the water run until it's clear, then close the faucet. It will help to get rid of any air trapped in the system.

Check for leaks

Once you've bled out the air from the system, it's essential to check for leaks. Do this by turning on the water supply and all the hot water faucets in your home. Let the water run for some time, then check all the connections to ensure they're tight. If you notice any water leaking, you'll need to tighten the connections or replace the gaskets.

Enjoy your new hot water system

Now that your new hot water system is installed and working correctly, it's time to enjoy it! Take a hot shower, wash some dishes, or do laundry without worrying about running out of hot water. Your new system will provide you with hot water for years.

Hot Water Systems Brands

There are different types and brands of hot water systems on the market, so how do you find the right one for you? Below is a list of the top hot water system brands to help you make an informed decision.


Rheem is among the top manufacturers of hot water systems in Australia. The Rheem Plus is the premium range of hot water systems with several features, including a stainless-steel tank. A Rheem hot water system is excellent for those looking for a reliable and affordable heating option.


Bosch is another leading manufacturer of hot water systems. Bosch hot water systems are known for their high quality and durability. The brand has a variety of products, from entry-level to premium. The Bosch Therm is their top-of-the-range product and comes with several features, such as a stainless-steel tank and a 12-year warranty.


Dux has been manufacturing hot water systems in Australia for over 100 years. They have quality and reliable products to suit any need. The company also provides a seven-year warranty on all of its products, so you can be sure your investment is protected.


Vulcan has been making hot water systems for over 50 years. They offer a wide range of gas, electric, and solar models. One way Vulcan sets itself apart from the competition is its focus on safety. All of their models come with a safety switch that automatically shuts off the unit if it starts to overheat.

Rinnai Infinity

Rinnai is one of the most popular hot water system brands in Australia. The company offers various products, including gas, electric, and solar hot water systems. Rinnai also has a variety of accessories and parts to keep your system running smoothly. The hot water system brand has been around for over 50 years and is known for its quality products and customer service.

Stiebel Eltron

This German company has been around since 1924 and is a world leader in solar, heat pumps, and electric water heaters. They have a variety of products to meet any need, from small under-sink units to large commercial models. Stiebel Eltron also makes tankless water heaters, which are becoming increasingly popular.

Thermann Hot Water

Thermann is an Australian company that offers a wide range of electric, solar, and gas hot water systems. They strongly focus on energy efficiency and offer some of the most advanced products on the market. Thermann also has a range of tankless water heaters, perfect for those who want instant hot water on demand.

Professional Hot Water System Installations

When it comes to hot water system installations, you want to ensure that you hire a professional. Hot water systems can be hazardous if not installed correctly. While it may appear that it can be a DIY task, the truth is that if you aren't a plumber yourself, it's best not to try it yourself. There is also a risk of the need for emergency plumbing after installing the hot water system. And if you don't have the skills for this, it could end badly.

A professional will have the training and experience necessary to install your hot water system safely and correctly. If emergency plumbing is needed, a professional can also handle this quickly and efficiently. So, if you need hot water system installations, hire a professional! They'll get the job done right and keep you safe.


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