Continuous Flow Hot Water vs Storage Tank Hot Water Systems: Which Is Right for Your Home?
If your hot water system is nearing the end of its life, you’re probably wondering whether to replace it with another storage tank system or upgrade to a continuous flow hot water service.
Both systems have their advantages, and the best option depends on your household size, hot water usage and budget.
At Better Plumbing Solutions, we regularly install, repair and replace both continuous flow and storage hot water systems across Melbourne. Here’s what you should know before making a decision.
What Is a Continuous Flow Hot Water System?
A continuous flow hot water system, sometimes called an instantaneous hot water system, heats water only when you need it.
Instead of storing hot water in a tank, cold water passes through a heat exchanger and is heated instantly as it flows through the unit.
Popular continuous flow brands include:
- Rinnai
- Rheem
- Bosch
- Thermann
Benefits of Continuous Flow Hot Water Systems
Endless Hot Water
One of the biggest advantages is that you won’t run out of hot water.
As long as the unit is operating within its capacity, hot water is available whenever you need it.
This is ideal for:
- Large families
- Multiple bathrooms
- Busy households
- Homes with high hot water demand
Lower Energy Consumption
Continuous flow systems only heat water when required.
Unlike storage tanks, there is no need to continuously reheat stored water throughout the day.
This can help reduce energy consumption and ongoing running costs.
Space Saving Design
Continuous flow units are compact and wall-mounted.
They take up significantly less space than traditional storage tanks, making them ideal for:
- Smaller homes
- Townhouses
- Apartments
- Renovations
Longer Lifespan
Many quality continuous flow systems can last 15–20 years when properly maintained.
Potential Drawbacks of Continuous Flow Systems
Higher Initial Installation Cost
Continuous flow systems often cost more to purchase and install than a standard storage tank replacement.
Gas Supply Requirements
Some homes may require gas line upgrades if changing from an electric storage system to a gas continuous flow unit.
Flow Rate Limitations
Very large households using multiple showers and appliances simultaneously may require a larger unit or multiple units.
What Is a Storage Tank Hot Water System?
A storage hot water system heats and stores water in an insulated tank ready for use.
These systems can be powered by:
- Gas
- Electricity
- Heat pump technology
- Solar energy
Storage systems remain one of the most common hot water solutions found in Australian homes.
Benefits of Storage Tank Hot Water Systems
Lower Upfront Cost
Replacing an existing storage tank with a similar model is often the most affordable installation option.
Suitable for Peak Demand
Larger storage tanks can supply significant amounts of hot water during busy periods.
Simpler Replacement
If your existing system is a storage tank, replacement is often straightforward and cost-effective.
Available in Many Sizes
Storage systems are available in various capacities to suit:
- Singles
- Couples
- Families
- Large households
Potential Drawbacks of Storage Tank Systems
Can Run Out of Hot Water
Once the stored hot water has been used, the system requires time to reheat.
This can be frustrating for larger households.
Higher Energy Usage
Storage tanks lose heat over time, requiring water to be reheated even when no hot water is being used.
Larger Footprint
Storage tanks require more installation space compared to continuous flow systems.
Shorter Lifespan
Many storage hot water systems typically last around 8–15 years depending on the model, water quality and maintenance.
Which Hot Water System Is Best?
Continuous Flow May Be Best If:
✔ You want endless hot water
✔ You want lower running costs
✔ You have limited installation space
✔ You’re upgrading an ageing system
✔ Energy efficiency is important
Storage Tank May Be Best If:
✔ You want a lower upfront cost
✔ You’re replacing an existing storage tank
✔ Your current plumbing setup suits a storage system
✔ You prefer a simpler installation
When Should You Replace Your Hot Water System?
Common signs your hot water system may need replacing include:
- Inconsistent hot water temperatures
- Rust-coloured water
- Water leaks
- Rising energy bills
- Reduced hot water capacity
- Frequent repairs
- System age exceeding 10–15 years
If you’re experiencing any of these issues, it may be time to consider an upgrade.
Why Choose Better Plumbing Solutions?
At Better Plumbing Solutions, we help homeowners choose the right hot water system for their property and budget.
Our services include:
✔ Hot Water Repairs
✔ Hot Water Servicing
✔ Continuous Flow Installations
✔ Storage Tank Replacements
✔ Gas Hot Water Systems
✔ Electric Hot Water Systems
✔ Residential & Commercial Hot Water Solutions
We work with leading brands including Rheem, Rinnai, Thermann and Bosch.
Frequently Asked Questions
Is a continuous flow hot water system cheaper to run?
In many cases, yes. Because water is only heated when required, continuous flow systems can be more energy efficient than traditional storage tanks.
Can I replace my storage tank with a continuous flow unit?
Yes. Many homeowners upgrade from storage systems to continuous flow systems when replacing an ageing hot water service.
How long does a continuous flow hot water system last?
With regular maintenance, many continuous flow units can last between 15 and 20 years.
Which hot water system is best for a family?
This depends on household size and usage patterns. Continuous flow systems are often ideal for larger families due to their ability to provide endless hot water.
Contact Better Plumbing Solutions
Need advice on upgrading your hot water system?
Better Plumbing Solutions provides professional hot water repairs, replacements and installations throughout Melbourne.
0468 582 686
Whether you’re considering a continuous flow upgrade or replacing an existing storage tank, our experienced plumbers can help you find the right solution for your home.