Understanding Hot Water Systems

Choosing the right hot water system for your home can be daunting. In this guide, we will explore the two main types: storage and instantaneous systems, detailing how they work and their benefits.

How Storage Systems Work

A storage hot water system heats water and holds it in an insulated tank, ready for use. When you turn on a hot tap, pre-heated water flows from the tank, and cold water enters to be heated for the next use. Storage systems are available in electric, gas, solar, and heat pump configurations. They're the most common type in Australian homes and are generally straightforward to install and maintain.

How Instantaneous Systems Work

An instantaneous — or continuous flow — system heats water on demand as it passes through the unit. There's no storage tank, which means you're not paying to keep a tank of water hot around the clock. When you turn on a hot tap, the unit fires up and delivers hot water within a few seconds. These systems are available in gas and electric configurations and are particularly popular in smaller homes and apartments where space is at a premium.

The Case for Instantaneous

The main appeal of instantaneous systems is efficiency. You only heat what you use, which can reduce running costs compared to a storage system that maintains temperature through the night and when the house is empty. They also offer unlimited hot water — there's no tank to run out of. For households with high or unpredictable hot water demand, or for homes where two showers might run simultaneously, this is a genuine advantage.

The Case for Storage

Storage systems have a lower upfront cost and are compatible with solar and heat pump technology, which can make them very cheap to run over time. They also deliver hot water at consistent pressure and temperature from the first moment. For households with predictable routines and the roof space for solar collectors or the outdoor space for a heat pump, a storage system combined with renewable heating is hard to beat on running costs.

What About Hot Water Pressure?

Instantaneous systems are pressure-sensitive — the flow rate they can heat depends on the incoming water pressure and temperature. In properties with lower mains pressure, some continuous flow units may struggle to maintain temperature at higher flow rates. Storage systems deliver water at mains pressure regardless of tank size. If your property has variable or lower pressure, this is worth discussing with a plumber before choosing a system.

Talk It Through with Allied Plumbing

There's no single right answer — the best system depends on your household size, energy setup, roof orientation, available space, and budget. Allied Plumbing installs both instantaneous and storage hot water systems across the Sunshine Coast and Noosa. Call 0428 411 487 or visit alliedqld.com.au to get advice tailored to your home.