A Guide To Finding The Right Size Of Tankless Water Heater

Before you purchase a tankless water heater, you’ll want to make sure that it’s the right size for your home. A smaller heater can sometimes work better than a larger one, but there are several factors that affect the size of your tankless water heater. If you don’t pick the right size, you might end up spending a lot of money on hot water repairs in Canberra.

The first thing to know about sizing is how much hot water you will use when taking into account all of the faucets, showers and appliances in your home — this will help give you an estimate on how big of an appliance is needed for your space.

Measure the Size of Your Home

The size of your home is important when you are choosing a tankless water heater. The reason for this is that they only heat up water when needed, so the larger your home is and the more people who use hot water in it, the larger the capacity unit you should buy.

Knowing how to measure your home can help you find the right size tankless water heater for it. To do this, take measurements from room to room using a measuring tape or ruler and make sure you note measurements for both width and length. After that, calculate the square footage by multiplying the width by length (width times length = square footage).

Once you have calculated square footage for each room in your house, add them all together to get total square feet which will tell us how large our homes are overall. This number helps determine what kind of heating system would work best in our homes based on average usage patterns throughout the year with medium temperature settings at home during summer months where we don’t need much hot water since outside temperatures rise above 40 degrees Celsius during those periods where everyone prefers cold drinks over ice cream bars instead!

Measure The Water Fixtures

To get the right size tankless water heater, you will need to measure your water fixtures. You can do this by measuring the flow rate of each fixture and adding up the flow rates to get an average. The flow rate is measured in gallons per minute (GPM). The average GPM of your home’s fixtures will tell you how much hot water an installed tankless system should be able to deliver for multiple uses at once.

If you have a large family or use a lot of hot water throughout your house, consider getting a larger unit with higher capacity than what’s recommended by default.

Measure Water Supply

When you’re measuring the water supply, it’s best to measure in gallons per minute (GPM) and not gallons per second (GPS). The reason for this is that many tankless models are able to heat up your water to a temperature where they can create steam, which means they no longer need to be attached directly to your plumbing system.

If you have an actual tankless model with an integrated pump and heater, then it will give you no problems when switching between hot and cold water flow rates or pressure. However, if your unit has been plumbed into your existing plumbing system—even if only temporarily so that it can be adjusted—then it will still operate at its full capacity even when there isn’t enough pressure behind that flow rate.


In the end, it’s important to remember that different tankless water heaters have different capacities and energy requirements. Selecting the right one will ensure that you don’t spend a lot of money on hot water repairs in Canberra. Some have higher flow rates than others, and some require less heat input to heat water more quickly. It all depends on what you need from your new unit!

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