Continuous flow — also known as tankless — hot water systems deliver hot water on demand. Instead of heating and storing water in a tank, these systems heat water as it passes through, meaning you never run out. They’re compact, efficient, and ideal for modern households looking to save space and reduce energy waste.
What Is a Continuous Flow Hot Water System?
This system doesn’t store hot water. Instead, it activates only when a hot tap is turned on. A flow sensor detects the movement of water, igniting a burner that heats the water instantly via a heat exchanger. Once the tap is turned off, the unit stops — using energy only when required.
How It Works
- Cold water enters the unit when a tap is opened
- A flow sensor activates the burner
- Gas ignites and heats a compact heat exchanger
- Water passes through the heated exchanger and exits as hot water
- Exhaust gases are vented through a flue
There’s no tank, no storage, and no standby heat loss. Water is heated as needed, endlessly — as long as gas and water flow are available.
Where Older Systems Fall Short
Many households still rely on traditional tank systems, which:
- Run out of hot water during peak use
- Heat water continuously, even when it’s not needed
- Take up more space indoors or outdoors
- Are harder to mount in small or narrow areas
- Heat large volumes, even for small usage
These drawbacks make tankless systems an appealing upgrade for energy-conscious households and modern homes with space constraints.
What Makes Modern Continuous Flow Systems Better
Today’s systems are more advanced than early tankless models. Features include:
- Compact design — easy to wall-mount indoors or out
- Electronic ignition (no pilot light gas waste)
- Smart temperature controls and remote digital displays
- Compatible with solar hot water pre-heating
- Flow control systems for consistent pressure
- Some models rated for low-pressure or rural setups
They’re especially well-suited to homes with steady or high hot water demand throughout the day — like large families or properties with multiple bathrooms.
Common Issues and What to Watch For
While reliable, continuous flow systems still need periodic servicing. Signs something’s wrong:
- Delay in hot water delivery
- Inconsistent water temperature
- Error codes on digital display
- Burner won’t ignite or cycles too frequently
- Reduced water pressure
These issues may indicate a sensor fault, heat exchanger scale buildup, or gas flow problems — all of which should be addressed by a qualified plumber.
Why Use a Licensed Plumber
Tankless systems must be precisely installed. A licensed plumber will ensure:
- Safe and correct gas connection
- Proper flueing and ventilation
- Water pressure compatibility
- Compliance with regulations
- Optimal location for flow performance
RJT Plumbing and Gas has experience with all major brands and will assess your home’s layout, demand, and budget before recommending a system.
Comparing Other Systems?
Still deciding what’s right for your home? Compare continuous flow systems with these alternatives:
- Electric Storage Hot Water Systems
- Gas Storage Hot Water Systems
- Heat Pump Hot Water Systems
- Solar Hot Water Systems
Each has its place — we’ll help you figure out which fits yours.
Book a System Assessment
Thinking of switching to continuous flow? We’ll assess your home’s suitability, explain installation options, and quote the right-sized unit for your household.
