FAQs

Based on my professional experience of over 30 years in hot water plumbing, my view is that they are not necessarily better in many situations.

Government messaging often highlights that heat pump systems can be up to 70% more energy efficient than standard electric systems. While this can be technically true when comparing hourly energy input (for example, a heat pump operating at approximately 1.8 kW versus a standard electric element at around 4.8 kW), it does not always reflect real-world performance over a full heating cycle.

A more practical comparison is the total energy required to heat a full tank of water from cold to operating temperature. A standard 315L electric hot water system typically takes around 3.5 hours to heat, using approximately 17 kWh. In contrast, a heat pump system – particularly in cooler climates such as the Shoalhaven area, and especially during winter – can take anywhere from 8 to 15 hours, using approximately 15 to 27 kWh under continuous tariff rates.

Another important factor is electricity tariffs. Standard electric systems can often be connected to off-peak tariffs, which significantly reduces running costs. Heat pump systems generally operate on continuous tariffs, which can increase overall energy expenses.

Cost and maintenance are also key considerations. A heat pump system typically costs around $6,000 to supply and install. While government rebates may be available initially, replacement systems are usually at full cost. Although tank warranties are often around 10 years, many components—such as compressors, fans, and pumps—have shorter warranty periods and are more prone to failure. Repairs can also be more complex, with parts and qualified technicians not always readily available.

By comparison, a standard 315L electric system generally costs between $2,500 and $3,000 installed. These systems also come with a 10-year tank warranty, and their components (such as elements, thermostats, and valves) are widely available, relatively inexpensive, and can often be repaired or replaced quickly – usually within the same service call.

In my experience, many heat pump systems do not consistently reach their full expected lifespan, whereas standard electric systems remain reliable and straightforward to maintain.

The answer largely depends on the type of gas supply and the household’s usage patterns.

With natural gas, running costs can be comparable to an off-peak electric hot water system. However, usage plays a significant role. A common way to look at it is: with electric systems, once the stored hot water runs out, usage stops. In contrast, with natural gas instantaneous systems, hot water is continuous—meaning higher usage can lead to higher overall costs.

With LPG (propane), costs can increase more noticeably depending on consumption. For example, an average family of five using hot water for around 45 minutes per day with a typical 26L continuous flow unit (rated at approximately 199 MJ/hour) may use around 150 MJ of gas per day. A standard 45 kg LPG bottle holds approximately 2,000 MJ, which equates to roughly 13 days per bottle—so ongoing costs can add up quickly depending on current LPG prices.

Another important consideration today is the increasing use of solar power and battery systems. Many households can take advantage of solar energy during the day to heat a standard electric hot water system at little to no cost, making electric systems a more economical and energy-efficient option in these situations.

Ultimately, the best choice depends on your energy source, household size, and usage habits.

Yes, ceramic disc taps are an excellent alternative to traditional washer taps. They provide a reliable, positive shut-off and are much easier to operate, making them particularly suitable for people with arthritis or reduced hand strength.

Ceramic disc taps are available in quarter-turn, half-turn, and three-quarter-turn options, depending on the brand and design. They are also now widely available at reasonable prices.
One of the key advantages is reduced maintenance. Unlike washer taps, they do not rely on rubber washers that can wear out or be damaged by overtightening, which helps avoid unnecessary plumbing call-outs.

There is a wide range of styles to choose from, however it is important to select quality products. Lower-cost options from general hardware outlets may not offer the same durability. It is recommended to choose well-known brands and purchase from a reputable plumbing supplier to ensure long-term reliability.