An instant hot water system – also known as a continuous flow or tankless water heater – gives you hot water exactly when you need it, and only when you need it. Instead of storing hot water in a bulky tank which needs to be stored on your property, it heats water on demand as you turn on the tap.
This space-saving solution is ideal for households wanting to cut back on energy costs and free up room in the laundry, kitchen, or bathroom. Whether you’re doing the dishes or jumping in the shower, an instant hot water system means no more running out of hot water midstream because there is no tank to be depleted.
It’s an efficient, reliable option for modern homes, and a smart upgrade if you’re looking to save on power and avoid the hassle of a traditional tank setup.
How does an instant hot water system work?
Wondering how an instant hot water system works? It’s surprisingly simple and efficient.
When you turn on a hot tap, cold water flows into the unit. A gas burner or electric element activates immediately, heating the water as it moves through a specially designed heat exchanger. Within seconds, hot water is delivered straight to your tap with no need to wait for a storage tank to fill or reheat.
Unlike traditional systems that constantly keep a tank of water warm, an instant hot water system only heats what you use, when you use it. This eliminates standby heat loss and avoids wasting energy on water you don’t need.
It’s a smart, on-demand solution that helps lower your energy bills and reduce environmental impact (due to its higher efficiency rating), all while keeping your showers comfortably warm.
Instant gas hot water systems
An instant gas hot water system uses a gas burner to rapidly heat water as it flows through the unit, delivering hot water to your tap in just a few seconds. It’s a reliable and efficient choice for larger households or homes with high water usage, especially where multiple bathrooms or appliances are in regular use.
One of the biggest benefits of gas systems is their ability to maintain strong performance during peak times. Whether you’re running the dishwasher, a couple of showers, and a washing machine all at once, you’ll still get a steady stream of hot water without interruption.
They’re also a smart option for energy-conscious families. Natural gas is often cheaper than electricity, which can lead to lower running costs over time. Plus, instant gas units keep working even during power outages, which is an added bonus for larger households that value reliability.
Installation does require a few extra considerations, including a dedicated gas connection and proper ventilation that complies with local regulations. For indoor models, a flue (duct or passage) may be needed to safely vent emissions. A licensed plumber or hot water specialist can advise on the best setup for your home.
Instant electric hot water systems
An instant electric hot water system uses an electric heating element to warm the water as it flows through the unit, providing hot water on demand without the need for a storage tank. These systems are compact, sleek, and easy to install – making them ideal for smaller homes, apartments, offices, or granny flats.
Electric models are especially well-suited for households with lower hot water requirements, such as one or two people living in a smaller space. They work best when used with just a couple of taps at a time, like in a bathroom or kitchenette setup.
While they may not match the high flow rates of gas systems, they make up for it with simplicity and flexibility. There’s no need for a gas line or venting, and they can be installed closer to the point of use – helping to reduce water wastage and waiting time.
If you’re looking for a budget-friendly, low-maintenance, and environmentally conscious solution, an instant electric hot water system is a smart, space-saving choice.
Gas vs electric: what’s best for you?
Not sure whether to choose gas or electric? Here’s a quick comparison to help you decide. Whether you want a low-maintenance option or you’re planning for long-term efficiency, thoroughly comparing gas vs electric hot water systems upfront can make all the difference long-term.
| Feature | Instant gas | Instant electric |
| Energy source | Natural gas or LPG | Electricity |
| Installation | Requires gas connection and venting | Easier installation, no venting |
| Operating costs | Generally lower | Potentially higher |
| Ideal for | Larger households | Smaller households |
| Environmental impact | Emits greenhouse gases | Can be paired with renewable energy |
Still unsure? A licensed plumber can help you weigh up the options and choose the instant hot water system that suits your household’s needs.
Why choose an instant hot water system?
If you’re tired of running out of hot water or paying to keep a tank heated 24/7, an instant hot water system could be the upgrade your home needs. Here’s why more Brisbane homeowners are making the switch:
- Hot water on demand – no more waiting or cold surprises.
- Energy-efficient – only heats water when you need it.
- Space-saving – compact units fit neatly on a wall.
- Modern performance – reliable, fast, and built to last.
Whether you live alone or with a busy household, these systems are designed to keep up.
Need help choosing?
If you’re still weighing up the options, a licensed plumber can offer advice tailored to your home’s setup.
Brisbane Plumbing & Drainage can help with expert guidance and professional installation when you’re ready.
