Save Money by Making Your Bathroom More Energy Efficient
March 19, 2025
Transforming your bathroom into an energy-efficient space is not just an environmentally responsible choice—it’s also a practical way to lower household expenses. With rising water and electricity costs, implementing sustainable solutions can lead to significant savings over time. Whether you're planning a full-scale renovation or making small upgrades, adopting an energy-conscious approach can enhance comfort, functionality, and long-term efficiency.
Learn about practical strategies for designing bathrooms in Central Coast that prioritise energy efficiency without compromising on style or comfort. Understand the importance of an efficient layout that optimises water and energy usage, helping you make informed decisions during your bathroom design or remodel. In addition, installing water-saving fixtures can significantly reduce your water consumption while enhancing the overall functionality of your space. Discover how to maximise natural light to minimise reliance on artificial lighting and mechanical ventilation. By implementing these strategies, you can enjoy a bathroom that is as kind to your wallet as it is to the environment.
Efficient Layout for Water and Energy Savings
A well-planned bathroom layout is one of the most effective ways to reduce water and energy waste. Poor fixture placement, inefficient plumbing, and poorly designed drainage systems can lead to long wait times for hot water, excessive water use, and unnecessary energy consumption. By making strategic design choices, you can create a bathroom that is both functional and cost-effective.
Smart Fixture Placement
The location of key fixtures—shower, sink, toilet, and bathtub—directly impacts how much energy and water your bathroom consumes. Poorly placed fixtures can result in excessive plumbing lengths, slow hot water delivery, and increased energy use.
Group Fixtures Along One Wall
Installing all major plumbing fixtures along a single wall is one of the most effective ways to reduce water waste and lower energy consumption.
Minimises Plumbing Lengths – When fixtures are scattered across multiple walls, plumbing pipes must run further, increasing water travel time and heat loss before it reaches the fixture. Keeping showers, sinks, and toilets along one wall significantly shortens pipe runs, allowing hot water to reach taps and showers faster.
Lowers Installation and Maintenance Costs – Having a single plumbing wall simplifies installation, requiring less piping and fewer connection points, reducing the risk of leaks and long-term maintenance costs.
Prevents Pressure Loss – A compact plumbing layout maintains consistent water pressure, preventing uneven flow in showers and taps.
Position the Water Heater Close to High-Use Fixtures
The distance between the water heater and fixtures is one of the biggest factors affecting water and energy efficiency.
Shortens Hot Water Delivery Time – The farther hot water has to travel through pipes, the more heat is lost, requiring additional energy to keep the water warm. Placing the heater near showers and sinks ensures faster hot water delivery and reduces heat loss.
Reduces Water Waste – Long plumbing runs mean users must wait longer for hot water, often letting water run unused down the drain. By placing the water heater closer to high-use fixtures, you can cut down on unnecessary water waste.
Best Placement Options – The best location for a hot water system is typically in a central position relative to the bathroom and kitchen, reducing overall pipe lengths.
Consider a Point-of-Use Water Heater
For bathrooms far from the main water heater, a point-of-use water heater (such as an electric or gas-powered tankless heater) can be installed under the sink or near the shower to deliver instant hot water without heat loss.
Best for Large Homes or Remote Bathrooms – If the bathroom is located far from the main hot water system, a point-of-use unit can eliminate long wait times for hot water.
Reduces Energy Use – Instead of keeping water warm in long pipe runs, these heaters only activate when needed, making them more energy-efficient in bathrooms that are used frequently.
Compact and Easy to Install – Small tankless water heaters can be installed discreetly in vanities or storage areas without requiring major renovations.
Efficient Plumbing Design
A well-designed plumbing system delivers hot water quickly and efficiently, minimising heat loss, water waste, and unnecessary energy use.
Minimise Pipe Lengths and Bends
Short, direct pipe runs reduce the time it takes for hot water to reach the tap, cutting down on both water waste and energy use.
Avoid unnecessary bends and detours in plumbing lines, as these create resistance and slow down water flow.
Use larger-diameter pipes where necessary to maintain good water pressure while ensuring efficient hot water delivery.
Use Pipe Insulation
Uninsulated pipes lose a significant amount of heat as hot water travels from the heater to the fixture, making the system less efficient.
Install foam or fiberglass insulation on hot water pipes to reduce heat loss by up to 45%.
Insulating cold water pipes can also prevent condensation buildup, reducing mould risks and potential damage to walls and flooring.
For maximum efficiency, insulate all pipes running through unheated areas such as garages, basements, or exterior walls.
Install a Hot Water Recirculation System
In larger homes, a recirculation system can eliminate the wait for hot water by continuously circulating warm water through the pipes.
Prevents Wasted Water – Instead of running the tap while waiting for hot water, a recirculating system delivers hot water instantly.
Can Be Installed on a Timer or Motion Sensor – Some systems operate only when needed, preventing unnecessary energy use.
Ideal for Homes with Long Plumbing Runs – If your bathroom is located far from the hot water system, a recirculation pump can drastically improve efficiency.
Optimising Drainage for Water Conservation
A well-designed drainage system prevents water pooling, reduces unnecessary water use for cleaning, and improves overall bathroom functionality.
Ensure Proper Floor Sloping
A bathroom floor should be sloped at 1:50 (2%) to direct water effectively into the drain, preventing standing water that requires additional cleaning.
Poor drainage leads to excessive mopping and rinsing, increasing water wastage over time.
Sloped shower floors ensure that water flows directly into the drain, rather than pooling in corners.
Position Drains Strategically
Shower drains should be placed at the lowest point of the floor to ensure efficient water flow.
Linear drains (installed along one edge of the shower) allow for a more even water flow, reducing unnecessary water spread.
Properly placed sink drains prevent water backup, improving water efficiency and reducing plumbing issues.
Consider Greywater Recycling
A greywater system collects used water from sinks, showers, and bathtubs and repurposes it for toilet flushing or outdoor irrigation, reducing freshwater consumption.
Best for Households Looking to Reduce Water Bills – Greywater systems can cut down on water usage by up to 50%, leading to substantial savings.
Requires Proper Filtration and Maintenance – Filtration ensures greywater is safe for non-drinking uses and prevents plumbing blockages.
Ideal for Sustainable Homes – When combined with rainwater harvesting, a greywater system can significantly lower household water demand.
Install Water-Saving Fixtures
Upgrading to water-efficient fixtures is a practical and cost-effective way to lower household water consumption without compromising comfort or functionality. Modern water-saving fixtures are designed to maintain strong water pressure while using significantly less water, leading to lower utility bills and sustainable resource management. Whether you're renovating your bathroom or making small upgrades, choosing WELS-rated water-efficient fixtures ensures compliance with Australian water conservation standards while delivering real-world savings.
Low-Flow Showerheads
Showers account for a significant portion of household water use, with traditional showerheads consuming 15–20 litres per minute. Upgrading to low-flow models can cut this usage to 6–9 litres per minute, saving thousands of litres annually without compromising water pressure.
How to Choose an Efficient Showerhead
Look for WELS-rated models – Select a 3-star or higher WELS-rated showerhead to ensure optimal water efficiency while maintaining comfortable water pressure. The higher the star rating, the greater the savings.
Understand Aerated vs. Laminar Flow Technology –
Aerated showerheads mix air with water to create a softer, more voluminous spray while reducing water use. These are ideal for homes with high water pressure.
Laminar-flow showerheads produce separate, steady water streams, reducing misting and heat loss—better suited for areas with lower water pressure.
Consider Adjustable Flow Options – Some models feature customisable settings, allowing users to switch between water-saving modes and stronger flow options for added comfort.
Installation Tips
Replace old showerheads with a screw-on retrofit model for a quick, affordable water-saving upgrade.
Test water pressure before installation to ensure the chosen model provides effective coverage.
Clean showerheads regularly to prevent limescale buildup, which can restrict water flow and reduce efficiency over time.
Dual-Flush Toilets
Toilets are one of the largest water consumers in a household. Older, single-flush toilets use up to 12 litres per flush, while dual-flush models can reduce water usage by over 60%, making them an essential upgrade for water conservation.
How Dual-Flush Toilets Save Water
Two Flush Options –
Full flush (4.5–6 litres) for solid waste.
Half flush (3 litres) for liquid waste, significantly reducing unnecessary water use.
Designed for Modern Plumbing Systems – Many older toilets use inefficient flushing mechanisms, leading to excessive water use. Dual-flush systems optimise waste disposal with minimal water.
Efficient Flushing Mechanisms – Modern rimless designs and powerful flush technology ensure thorough cleaning with less water per flush.
Installation & Maintenance Considerations
Ensure the toilet is compatible with existing plumbing – Some older homes may require pipe adjustments or tank retrofits to accommodate a dual-flush system.
Check for Leaks Regularly – Even an efficient toilet wastes water if the flapper or flush valve deteriorates. A constantly running toilet can waste thousands of litres per year.
Consider a Retrofit Kit – If replacing the entire toilet isn’t an option, installing a dual-flush conversion kit on an existing tank can provide instant water savings at a lower cost.
Aerated Faucets
Bathroom sinks are used multiple times a day, and unrestricted faucets can waste over 10 litres per minute. Installing aerated faucets can cut water use by nearly 50% while maintaining strong pressure for washing hands, brushing teeth, and general use.
Choosing an Efficient Faucet
Opt for a 4-star or higher WELS-rated model to ensure significant water savings.
Select models with built-in aerators – Aerators mix air with water, creating a full, consistent stream while reducing water flow.
Consider sensor-activated or timed faucets – These automatically shut off after a set period, preventing unnecessary water waste in busy households.
Installation & Maintenance Tips
Aerators can be installed on existing faucets by screwing them onto the tap opening.
Regularly clean aerators to remove mineral buildup that may restrict water flow.
Replace older faucets with newer models featuring flow restrictors to further reduce water use without affecting functionality.
Water-Efficient Bathtubs
Although showers are generally more water-efficient, many households still prefer the comfort of a bath. Choosing a water-efficient bathtub ensures you can enjoy a soak without excessive water waste.
What to Look for in a Water-Efficient Bathtub
Opt for a smaller-capacity bathtub – Traditional tubs can hold up to 200 litres, but water-efficient designs use 130–150 litres while maintaining comfort.
Built-in overflow prevention – Prevents overfilling and eliminates unnecessary water waste.
Insulated Bathtubs – Thermal insulation helps retain heat, reducing the need for additional hot water top-ups during a bath.
Tips for Reducing Bath Water Waste
Fill only what’s necessary – Avoid filling the tub to the brim. Even reducing water by 5–10 cm can save dozens of litres per use.
Use a well-sealed bathtub stopper to prevent leaks and retain water effectively.
Repurpose used bathwater for garden irrigation if using eco-friendly, biodegradable bath products.
Greywater Systems
A greywater system captures and filters lightly used water from showers, sinks, and bathtubs, repurposing it for toilet flushing or outdoor irrigation.
Benefits of Greywater Recycling
Cuts freshwater consumption by up to 50% – Reducing reliance on clean drinking water for non-drinking purposes.
Reduces strain on septic and sewage systems – Less wastewater flows into municipal treatment plants, lowering household environmental impact.
Provides an eco-friendly solution – Ideal for households looking to increase sustainability and lower water bills.
Greywater System Considerations
Professional installation is recommended – Systems must comply with local council regulations and be properly filtered to prevent contamination and odour issues.
Regular maintenance is essential – Filters and pipes should be cleaned periodically to prevent clogs and bacterial buildup.
Use greywater-safe cleaning products – Harsh chemicals in soaps or detergents can damage plants and clog irrigation systems.
Maximise Natural Light and Ventilation
Maximising natural light and ventilation in a bathroom reduces reliance on artificial lighting and mechanical ventilation, helping to lower energy consumption, prevent moisture damage, and improve air quality. A well-designed lighting and ventilation strategy not only makes the bathroom more comfortable and visually appealing but also enhances long-term durability by mitigating the risks of mould, mildew, and humidity-related damage.
Harnessing Natural Light to Reduce Energy Use
A well-lit bathroom feels more spacious, inviting, and functional while reducing electricity costs by minimising the need for artificial lighting during the day. The right window placement, reflective surfaces, and material choices can significantly impact how efficiently natural light is used in the space.
Optimal Window & Skylight Placement
North-Facing Windows for Consistent Daylight – Windows that face north receive indirect natural light throughout the day, reducing the need for artificial lighting without excessive heat gain.
High-Positioned Windows for Privacy & Light Flow – Installing clerestory windows or high-set frosted glass windows allows ample daylight in without sacrificing privacy. These windows work well in compact bathrooms with limited wall space.
Skylights for Windowless Bathrooms – A well-placed skylight or solar tube brings in natural light from above, making it an ideal solution for internal bathrooms that don’t have external walls. Tubular skylights are compact, cost-effective, and easier to install than traditional skylights while providing maximum daylight penetration.
Larger Windows with Frosted or Tinted Glass – Expanding window size improves brightness, but privacy concerns often limit window placement in bathrooms. Frosted, textured, or privacy-coated glass allows for uninterrupted natural light flow while maintaining discretion.
Ventilated Windows for Dual-Purpose Functionality – Installing awning windows with small opening sections improves air circulation while allowing light in, providing both natural ventilation and daylight exposure.
Maximise Light Reflection with Smart Design Choices
Strategic use of reflective materials, wall colours, and surfaces helps distribute natural light more effectively, reducing the need for excessive artificial lighting.
Install Mirrors Opposite Windows – Mirrors bounce daylight across the room, doubling the perceived brightness and making the bathroom feel more open.
Choose Light-Coloured Walls & Ceiling – Soft, neutral tones reflect light better than dark colours, ensuring even illumination throughout the space.
Use Glossy or Semi-Gloss Finishes – High-gloss ceramic tiles, polished stone, and glossy countertops reflect light more effectively than matte surfaces, enhancing brightness.
Incorporate Glass & Metallic Accents – Glass shower doors, chrome fixtures, and metallic trims scatter light naturally, preventing dark corners and shadows.
Optimising Artificial Lighting for Energy Efficiency
While natural light is ideal, artificial lighting is necessary for evening use, low-light conditions, and task-specific illumination. The right combination of LED fixtures, layered lighting, and smart controls ensures maximum efficiency without wasting energy.
Select Energy-Efficient LED Lighting
LEDs Use 80% Less Energy Than Traditional Bulbs – Compared to incandescent or halogen bulbs, LED lights consume significantly less power while lasting up to 25 times longer.
Choose WARM vs. COOL White Tones Based on Functionality –
Cool white (4000K–5000K) is ideal for task lighting around mirrors, providing bright, natural daylight-like illumination for grooming.
Warm white (2700K–3500K) creates a relaxing atmosphere, best suited for ambient lighting.
Dimmable LED Fixtures for Adjustable Brightness – Installing dimmer switches allows users to control light intensity, saving energy when full brightness is unnecessary.
Layered Lighting for Functionality & Comfort
A well-lit bathroom benefits from multiple light sources, ensuring the space is bright where needed while reducing glare.
Task Lighting for Mirrors & Vanities – Install side-mounted LED vanity lights instead of overhead lights to eliminate unwanted shadows on the face.
Ambient Lighting for General Illumination – Recessed ceiling lights, pendant lights, or flush-mounted fixtures provide overall brightness without harsh glare.
Accent Lighting for Aesthetic Appeal – Consider under-cabinet strip lighting, backlit mirrors, or LED cove lights to create a luxurious, energy-efficient atmosphere.
Use Smart Lighting Controls for Energy Savings
Motion Sensor & Timer-Based Lights – Prevent lights from being left on unnecessarily, automatically turning off when no movement is detected.
Zoned Lighting Controls – Enable independent control of different lighting sections, ensuring that only necessary lights are turned on.
Daylight Sensors for Adaptive Brightness – Some advanced LED fixtures adjust their brightness based on available natural light, reducing electricity consumption during the day.
Improving Ventilation for Energy Efficiency
Proper ventilation is essential in a bathroom to maintain air quality, prevent excess moisture buildup, and protect the space from long-term damage. Without adequate airflow, humidity can accumulate, leading to mould, mildew, peeling paint, and even structural deterioration. A well-ventilated bathroom also reduces reliance on air conditioning and heating systems, helping to minimise energy waste and improve overall comfort.
A combination of mechanical and natural ventilation is the most effective way to control humidity, prevent condensation, and improve air circulation. By implementing the right ventilation strategies and maintaining your systems, you can create a healthier and more energy-efficient bathroom.
Effective Ventilation Strategies
Bathrooms generate a high amount of moisture from showers, baths, and sinks, making it critical to have a well-designed ventilation system to prevent damp conditions. The following strategies help ensure efficient airflow and moisture control.
Humidity-Sensing Exhaust Fans
An exhaust fan is one of the most effective ways to remove moisture from a bathroom. However, traditional fans rely on manual operation, meaning they are often left on too long, wasting energy, or not used enough, allowing humidity to build up. Installing humidity-sensing exhaust fans is a more efficient solution.
Automatically activate when moisture levels rise, preventing condensation buildup, mould, and musty odours.
Reduce unnecessary energy use by running only when needed and shutting off once humidity is at an acceptable level.
Essential for bathrooms without windows, ensuring that excess moisture is properly removed from the space.
Choose corrosion-resistant models to withstand prolonged exposure to moisture, preventing rust and ensuring long-term efficiency.
Properly size the fan based on the size of the bathroom—larger bathrooms require more powerful fans with a higher air exchange rate.
To maximise the efficiency of an exhaust fan, it should be installed as close as possible to the shower or bath where the highest level of humidity is produced. The fan should also be vented outside the home, not into roof cavities or wall spaces, as this can lead to hidden damp spots that encourage mould growth and wood rot.
Cross-Ventilation for Passive Cooling
While exhaust fans provide mechanical ventilation, incorporating cross-ventilation into your bathroom design is a cost-effective and energy-efficient way to manage moisture and airflow. Natural ventilation is particularly beneficial in bathrooms with external walls.
Position windows on opposite walls to encourage air movement, creating a breeze that removes moisture and excess heat.
Install adjustable louvre or awning windows that can remain open in various weather conditions while maintaining privacy.
Consider skylights with venting capabilities, which allow hot, humid air to escape through the highest point of the room.
Cross-ventilation is an ideal solution for reducing humidity without relying solely on mechanical systems. When combined with an exhaust fan, it ensures a well-balanced ventilation system that minimises moisture retention and energy use.
Operable Windows Near Showers & Baths
Bathrooms with windows can take advantage of natural ventilation by strategically placing operable windows near moisture-heavy areas like showers and baths. Steam and humidity naturally rise, and without an immediate escape route, condensation will settle on mirrors, walls, and ceilings.
Placing openable windows near the shower or bathtub allows steam to escape as soon as it is produced, reducing condensation and moisture retention.
Awning windows provide ventilation even during rain, making them a practical option for year-round moisture control.
Frosted or textured glass maintains privacy while allowing light and airflow, ensuring an airy and well-lit bathroom.
For optimal ventilation, these windows should be paired with an exhaust fan, allowing for a combination of passive and mechanical airflow to effectively control humidity.
Louvered Doors & Wall Vents for Internal Bathrooms
Bathrooms located in the centre of a home or those without windows require additional passive ventilation measures to maintain air quality. Without proper airflow, these spaces can become damp and musty, even with an exhaust fan.
Louvered doors allow continuous air circulation, helping to remove excess humidity from an enclosed bathroom.
Passive wall vents improve airflow between the bathroom and surrounding areas, reducing stagnant air and preventing moisture buildup.
Ceiling vents can complement exhaust fans, further enhancing air exchange and humidity removal.
These passive ventilation strategies ensure that even bathrooms without direct access to outdoor airflow remain well-ventilated and free from persistent dampness.
Maintaining Ventilation Systems for Long-Term Efficiency
Simply installing ventilation systems is not enough—regular maintenance is essential to keep them functioning efficiently and to extend their lifespan.
Clean exhaust fans regularly to prevent dust and debris buildup, which can reduce efficiency and airflow.
Check and clean vent ducts at least once a year to remove any blockages, mould, or trapped debris that could affect air circulation.
Use stainless steel or corrosion-resistant materials in ventilation systems, especially in humid environments, to prevent rust and premature deterioration.
Ensure roof spaces and wall cavities are properly vented, as hidden moisture buildup in these areas can cause long-term structural damage.
Creating an energy-efficient bathroom is a smart investment that enhances both functionality and long-term cost savings. By optimising your layout, plumbing, and drainage, you can minimise water waste and improve energy efficiency without compromising comfort. Installing water-saving fixtures, such as low-flow showerheads, dual-flush toilets, and aerated faucets, ensures that your bathroom remains eco-friendly while maintaining strong performance.
Additionally, maximising natural light and ventilation reduces reliance on artificial lighting and mechanical ventilation, leading to lower energy consumption and a fresher indoor environment. Whether through strategic window placement, reflective surfaces, or humidity-controlled exhaust fans, these improvements help prevent moisture buildup and enhance air quality.
By incorporating these practical, real-world strategies, you’re not just reducing utility costs—you’re also increasing the value and longevity of your home. A well-designed, energy-efficient bathroom provides a sustainable and comfortable space that benefits both your household and the environment for years to come.
