How to Choose the Right Size Water Heater for Your Home

how to choose the right size water heater for your home

Choosing the perfect hot water system size for your house can be a bit like trying to hit the bullseye in darts – a touch tricky, but oh-so-satisfying when you get it right. We’ve all had that moment of bracing ourselves for a warm shower, only to cop an unwanted blast of cold water because our old hot water system just couldn’t hack it.

Strewth, we understand how maddening this can be. So we’ve put our heads together and done the hard yards of research to give you top-notch advice on selecting a hot water system that’s spot-on for your lifestyle.

And here’s a hot tip: going too large with your heater isn’t doing your wallet any favours – oversized units can chew through energy faster than a possum up a gum tree!

In this yarn, we’ll walk you through figuring out how much hot water you actually use, what factors come into play when choosing the size of your unit, and how to nail down the right capacity so that every shower feels like bliss rather than budget-busting.

Say hooroo to shivering under the shower head – there are warm days ahead! Stick around; we’re about to spill the beans on keeping cosy without costing the earth.

Key Takeaways

  • Know your household’s hot water usage to pick the best water heater. Count people, baths, and appliances that use hot water.
  • Think about your home size and climate when choosing a heater. Bigger families and colder places need bigger heaters.
  • Look for energy – efficient models to save on bills. High SEER ratings mean less power used.
  • Plan for the future in case you need more hot water one day. If your family grows or you build more rooms, you’ll need a larger system.
  • Use a hot water size calculator to find out what size suits your house best. Consider things like peak use times and how many bathrooms you have.

Understanding Your Water Usage

To determine the right size water heater for your home, it’s crucial to understand your household’s water usage. This includes factors such as the number of people in your household, daily activities that require hot water, and peak usage times throughout the day.

Tips for Determining Water Usage

We need to understand our daily water use before choosing the right size water heater. This helps us find a system that meets our needs without wasting energy.

  • Check past water bills for average usage. Look at the last few months to get a good idea of what you use.
  • Count the number of bathrooms in your home. More bathrooms often mean more water used.
  • Estimate how many hot showers each person takes per day. Add it up for the whole family.
  • Consider the washing machine and dishwasher. How often do you run them with hot water?
  • Think about times when your water use is high—like morning routines or evening baths.
  • Watch out for taps dripping or leaking. Fixing these can reduce your water waste.
  • Track any extra activities that use hot water, like filling a spa or a swimming pool.
  • Plan for guests or new family members. More people in your home will increase hot water needs.

Factors to Consider When Choosing a Water Heater Size

Consider household size, climate, budget, energy efficiency, and future expansion when selecting the right water heater size. Read on to learn more about choosing the perfect

water heater for your home.

Household Size

Consider your household size when choosing a water heater. Larger households need bigger systems to meet hot water demand. Calculate the appropriate size based on the number of

factors to consider when choosing a water heater size

people in your home, ensuring everyone has enough hot water.

When selecting a water heater, think about how many bathrooms and appliances will be using hot water. This information helps determine the capacity required for your household’s needs.

A larger family needs a system with greater capacity to ensure an adequate supply of hot water for daily use.


Now let’s consider the impact of climate on choosing the right size water heater. In Australia, where temperatures can vary significantly between regions, it’s crucial to take into account how much your household’s water usage may fluctuate with the seasons.

Warmer climates might mean less energy is needed to heat water, while in colder areas a larger system may be necessary to meet demand during winter months. Understanding these variations will help you select a water heater that meets your needs all year round.

Additionally, optimising for climate ensures that you’re making an energy-efficient choice for your home – saving money and reducing environmental impact over time.


When considering the budget for a new water heater, it’s essential to weigh the upfront cost against long-term savings. Look for energy-efficient models that may have a higher initial price but can significantly lower your utility bills over time.

Take into account potential installation costs and any rebates or incentives available for choosing environmentally friendly systems.

To ensure you select an appropriate hot water system size without stretching your budget, compare different options based on their lifespan and maintenance requirements. Don’t forget to factor in potential repair and replacement costs down the line when making your decision.

Energy Efficiency

To ensure energy efficiency, consider the EER rating when choosing a new water heater. Look for models with a higher Seasonal Energy Efficiency Ratio (SEER) to reduce energy consumption and save on utility bills.

Insulate your hot water pipes to minimise heat loss and maintain water temperature, which enhances energy efficiency.

Consider tankless or heat pump systems as they are more energy-efficient options compared to traditional tank-based water heaters. These systems provide hot water only when needed, reducing standby heat loss and overall energy usage.

Future Expansion

Consider potential household growth when selecting a water heater size. Plan for future needs by factoring in possible house expansions or additional family members. Account for extra hot water demand and choose a system that can accommodate your anticipated future requirements.

Be proactive in selecting a water heater that will meet the needs of your expanding household, ensuring it remains efficient and cost-effective over time.

Factor in future changes to your household when choosing the right size water heater. Anticipate any increase in hot water usage due to an expanding family or home renovations. Select a system with sufficient capacity to cater to these potential changes, allowing for smooth operation without needing frequent upgrades.

Types of Water Heaters and Their Sizing

When it comes to water heaters, there are various types such as tank-based systems, instant/continuous flow systems, solar water heating systems, and heat pump systems. Each type has its own sizing considerations that are essential for choosing the right system for your home.

To find out more about how each type is sized and which one might be best for you, read on!

Instant/continuous flow systems

Instant/continuous flow systems deliver hot water on demand without needing a storage tank. These systems are energy-efficient as they only heat water when you need it, saving both space and electricity.

They are ideal for small households or properties with limited space as they can be wall-mounted, freeing up valuable floor space.

Choosing the right type of water heater is crucial in ensuring that your household’s needs are met efficiently. Instant/continuous flow systems offer an effective solution for providing hot water without the need for a large storage tank.

Solar water heating systems

Solar water heating systems use the sun’s energy to heat water for your home. These systems are cost-effective and environmentally friendly. They are most efficient in areas with plenty of sunshine, making them a great option for UK households.

Installing a solar water heating system can help you save money on your energy bills while reducing your environmental impact. With proper sizing and installation, these systems can provide ample hot water for your household needs throughout the year.

Heat pump systems

Heat pump systems use electricity and refrigerant to transfer heat from the air or ground into your water. They are highly energy-efficient, making them a great choice for environmentally conscious homeowners.

These systems work well in moderate climates and can save you money on your energy bills over time.

When considering a heat pump system, it’s essential to think about the climate in which you live, as this will affect the system’s efficiency. Additionally, make sure to consider your budget and the long-term cost savings associated with these eco-friendly systems.

How to Determine the Right Size Water Heater

Using a hot water size calculator can help you determine the right size for your household, as well as considering factors like temperature rise and building type. It’s also important to

how to determine the right size water heater

consider energy efficiency and future expansion when choosing the best water heater for your home.

Using Hot Water Size Calculator

Determining right size water heater for your home, use a hot water size calculator.

  1. Input the number of people in your household to gauge the hot water usage.
  2. Consider the number of bathrooms and appliances that use hot water.
  3. Factor in your daily routines and peak hot water usage times.
  4. Take into account any future expansions or changes in your household size.
  5. Review the calculator’s recommendations based on your inputs.
  6. Use this information to guide you in selecting the appropriate water heater size for your family’s needs.

Considering Temperature Rise

Before choosing a water heater, make sure to consider the temperature rise needed for your household. Here’s how to do it:

  1. Evaluate the average incoming water temperature in your area.
  2. Determine the desired hot water temperature at the tap.
  3. Calculate the temperature rise by subtracting the incoming water temperature from the desired hot water temperature.
  4. Factor in any potential future changes in climate or seasonal variations.

Factoring in Building Type and Plumbing Infrastructure

Consider the layout of your home and the plumbing setup when selecting a water heater. The size of your building and the distance to plumbing connections can impact which type of water heater will be most effective.

Ensure that the selected system is compatible with your home’s infrastructure for optimal performance.

Tips for Saving Money and Choosing an Energy-Efficient Water Heater

To ensure that you choose a water heater that not only meets your family’s needs but also helps you save money and energy, consider the following tips:

  1. Select a water heater with a high Energy Star rating to maximise energy efficiency and reduce utility costs.
  2. Consider investing in a heat pump or solar water heating system to take advantage of renewable energy sources and lower long-term operating expenses.
  3. Insulate your hot water pipes to minimise heat loss and enhance the overall efficiency of your water heating system.
  4. Regularly maintain your water heater by flushing out sediment and checking for leaks to prolong its lifespan and maintain optimal performance.
  5. Compare the upfront and operational costs of different water heater models to determine which one offers the best balance of affordability and efficiency for your household.

Recommended Systems for Different Household Sizes

After considering various ways to save money and ensure energy efficiency with your water heater, it’s crucial to look at the recommended systems based on the size of your household. Below is a table that outlines the ideal water heater types for different family sizes, ensuring you get the perfect fit for your home.

House-hold SizeTank-based Systems (Litres)Instant/Continuous Flow (L/min)Solar Water Heating Systems (Litres)Heat Pump Systems (Litres)
1-2 people75-15516-24150-200170-200
3-4 people160-25024-32300-360270-300
5+ people300+32+360+300+

This guide ensures you take a step in the right direction when picking a suitable water heater. Remember, selecting the right size not only provides ample hot water but also optimises energy consumption for your living situation.

Don’t make a sizing mistake – call now to speak with our water heater experts

Understanding your water usage and considering factors such as household size, climate, budget, and future expansion is crucial when choosing the right size water heater.

Practicality is key – using a hot water size calculator and factoring in temperature rise can simplify the process. Have you considered how an energy-efficient water heater could save you money? This decision will impact your everyday comfort and utility bills significantly.

Remember to explore further resources if you need additional guidance. Take charge of your home’s efficiency today!