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Introduction to Retrofitting Your Hot Water System

Switching to a heat pump or a gas system with a higher star rating in Marrickville can lower both energy expenses and carbon footprint substantially.

Opting for a system designed for Sydney’s weather conditions can improve both efficiency and functionality. Available government rebates for energy-efficient systems can also help offset the cost of upgrading.

Later, we’ll delve into various systems including gas hot water and electric water heater options, discussing the pros and cons, costs, and payback periods. We’ll also touch on professional installation for optimal efficiency in your retrofit.

Evaluating Your Current Hot Water System

Before deciding to fit a new one, assess your current hot water system in Marrickville to determine if a retrofit is a valuable investment.

Evaluate the age and design of your existing system since dated models tend to be less efficient and may frequently run low on hot water. Identify the energy star rating on the unit’s nameplate or sticker; two or three stars typically mean moderate efficiency.

Inspect the physical condition of tanks, pipes and connections. Corrosion, leaks or loud rumbling noises can signal problems needing repair or replacement.

Analyse your energy bills to estimate running costs. Electric hot water heater units may cost $600+ per year to run. Efficacious gas or heat pump systems could slash this expense by half.

Contact Marrickville Plumbing Pty Ltd for an onsite inspection and tailored advice on upgrading components or the entire system.

Understanding Energy Efficient Upgrade Options

When upgrading hot water systems in Marrickville, Consider the following energy-efficient options:

Heat Pump Systems

Models like Sanden’s heat pump hot water systems offer more than triple the efficiency of traditional electric heaters using refrigerant cycles to harness ambient heat.


  • Low running costs - can halve pump hot water heating bills
  • Long lifespan - stainless steel construction
  • Quiet operation
  • Eligible for government rebates


  • Higher upfront cost
  • Require external ventilation
  • Efficiency varies with air temperature

High Star Rating Gas Systems

Seek out gas hot water systems with 4-6 star ratings for storage or 5-6 stars for instantaneous models suitable for Marrickville residences. Ensure correct sizing for your household’s usage.


  • Reduced energy bills compared to electric or lower-rated gas systems
  • Unlimited hot water with continuous flow designs
  • Generally, hot water heaters have a longer lifespan than electric models


  • Higher greenhouse gas emissions
  • More complex installs in some homes

Solar Hot Water

Solar collectors on your roof can pre-heat water, reducing reliance on your water tank or gas booster.


  • Cut energy bills by upwards of 60%
  • Lower carbon emissions
  • Can also work efficiently in Marrickville’s climate, which is conducive to both gas and solar water heater systems


  • Higher upfront cost
  • North-facing roof space required
  • May still need your gas hot water or electric to boost heat

Talk to our team about the most suitable system heat option for your household and budget.

Heat Pump Water Heaters

Heat pump water heaters stand out as highly energy-efficient options for Sydney homes. These appliances use a refrigeration cycle, similar to fridges or air conditioners, to draw heat from the air and warm the tank’s water.

Compared to a standard electric hot storage water heater, a heat pump system can be over 3 times more efficient, using less than a third of the electricity. This is because they utilise free renewable heat energy from the ambient air, consuming less electricity than systems relying solely on an internal heating element.

An electric water heat pump system could greatly reduce your energy bill over a period of 10 years. Their higher initial purchase price pays for itself over time through dramatically lower running costs for your electric gas water heat pumps. Sanden’s eco hot water heat pumps, made for Australia’s climate, have a lifespan exceeding 20 years.

As Sydney homeowners allocate approximately 25% of their household energy for hot water use, upgrading to an efficient heat pump system allows significant savings while reducing your carbon footprint. Get in touch with Marrickville Plumbing to see if a heat pump upgrade is suitable for your home.

Solar Hot Water Systems

Solar water heat pumps greatly reduce energy expenses by harnessing solar energy. Roof-mounted solar PV system panels can used to pre-heat water before it enters an insulated storage tank or instant gas booster.

In the Marrickville climate, solar hot water can meet 60-90% of a household’s demand. This translates into substantial yearly savings on electricity or gas expenses. Over a system lifespan of 15-20 years, solar hot water pays for itself several times over.

Solar PV systems have a higher initial cost than traditional models, yet you can offset this with government rebates. Long-term savings and environmental benefits make solar a smart investment. Reach out to Marrickville Plumbing to determine if solar hot water is a fit for your home.

Cost-Benefit Analysis of Upgrades

When considering upgrades to your hot water system, it’s key to weigh up the initial investment against potential savings and payback period.

The upfront cost of a new energy-efficient system like a heat pump or solar hot water unit ranges from $2,000 to $5,000 installed. Top-tier models featuring increased storage, superior materials, or added solar PV can reach prices of up to $10,000, regardless of being gas-electric hybrids.

When offset by impressive energy savings, significant financial returns are possible, usually with payback periods of less than 10 years. For example, Switching from an electric to a heat pump system can save approximately $300 annually. That’s $3,000 over 10 years, covering the initial outlay.

Of course, payback depends on your existing system, hot water usage, electricity tariffs, climate and the chosen replacement technology’s energy consumption. We advise contacting Marrickville Plumbing for a detailed analysis. Our experts can assess your current setup, model potential savings from upgrades and deliver a transparent cost-benefit breakdown.

While the upfront investment may seem daunting, take a long-term view on savings and environmental gains from improved efficiency. With technology advancements and rising energy prices, to replace your outdated systems is smart future-proofing.

Average Costs

When budgeting for a hot water system retrofit in Marrickville, expect to pay the following average costs:

Heat Pump Water Heater

For a 270L heat pump water heater, supply and installation costs range from approximately $2,500 to $4,000.

Gas Storage Water Heater

A 5-star, 160L storage hot water system, including supply and installation, ranges from about $1,200 to $2,000.

Gas Instantaneous Water Heater

Supply and installation of a 5.8 star gas instantaneous unit: $2,000 - $3,500

Solar Hot Water System

An electric-boosted solar system’s supply and installation fall in the price range of about $4,000 to $7,000.

Quoted prices cover parts, water storage components, labour and standard installation but can vary based on factors like roof type for solar systems. They exclude potential electrical work required for upgrades or gas line extensions which may add $500-1,500+ to overall costs.

For a tailored quote on an energy efficient hot water system for your Marrickville property, featuring new water-saving technologies, contact our team at Marrickville Plumbing today.

Return on Investment

When weighing up the costs of upgrading water your hot water system, an important consideration is return on investment (ROI) - how long it takes for energy savings to offset the upfront expense.

A heat pump system can save you roughly $300 each year when replacing an outdated electric storage heater. With a heat pump that can be installed for around $3,000, the payback period is approximately 10 years. After this time, the cumulative savings exceed the initial outlay on Replacing your old hot water heat pump unit.

Considering potential energy price increases, the ROI period can be even shorter over the product’s 20+ year lifespan. There are also added returns from government rebates and the boosted value of a property upgraded with sustainable hot water technology.

Switching from a 2-star to a 5-star gas system also sees a solid ROI. Although gas prices are stable, Using less of it still adds up when it comes to a new hot water system. And instantaneous gas heaters, which can provide endless hot water, cut consumption by 50% or more.

Ultimately, the financial viability relies on factors like existing unit efficiency, usage levels and electricity tariffs. But in most cases, upgrading to energy efficient systems pays dividends within 5-10 years.

The environmental returns are just as compelling. Systems like heat pumps, solar hot water and high-rating gas slash carbon emissions from water heating - often by half or more.

So while retrofitting hot water hardware requires an initial investment, the long-term financial rewards and sustainability gains make it well worthwhile. Contact our team at Marrickville Plumbing to discuss your system upgrade options and projected ROI.

Installation and Maintenance Considerations

Proper installation is essential when upgrading your hot water system in Marrickville to ensure maximum efficiency. Our licensed plumbers adhere to industry best practices, such as:

  • Sizing the system appropriately for your water consumption needs
  • Positioning heat pump external units with proper ventilation
  • Installing solar panels and roof collectors for water systems use, ensuring they face north for maximum sunlight exposure
  • Adjusting gas pressure and water flow correctly on your heat and gas hot water units
  • Updating electrical connections and circuits to handle new system power requirements
  • Integrating with smart controls for internet monitoring and tweaks
  • Completing certified compliance paperwork for rebates

Once correctly configured, make sure to maintain your system with annual inspections to keep it running at peak performance. Checks include:

  • Inspecting solar collectors and roof mounts for any damage
  • Checking refrigerant levels and fan operation on heat pump units
  • Flushing the tank to remove cold water sediment build-up in gas or electric storage heaters
  • Testing pressure relief and safety valves
  • Verifying ideal thermostat temperatures and timing settings

Marrickville Plumbing can manage new system installations and offer maintenance services. Call us today on 1300 349 338.

Rebates and Incentives

The Australian federal and NSW state governments offer rebates when Marrickville homeowners upgrade hot water systems to more energy efficient models.

You could qualify for rebates as high as $1000 when you switch from electric storage heaters to a heat pump or gas system. For more information on eligibility and application, our team is ready to assist. Solar hot water systems also attract up to $500 in government incentives.

Rebates vary based on factors like your existing systems efficiency rating, the model chosen, and who is installing it. As experienced plumbers helping Marrickville households access rebates for over 10 years, our team at Marrickville Plumbing guide you through the application process.

With the potential rebate amounts almost paying for professional installation alone, incentives make investing in a system new and efficient even more compelling. Discuss with our experts the available rebates when considering your new hot water system options.

News & Information

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Retrofit Your Hot Water For Better Efficiency

Replacing an outdated electric, gas or solar hot water system with a more efficient heat pump or solar model can significantly reduce your energy bills and carbon footprint. Take advantage of available rebates. Contact us to retrofit your old system today.

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Why Your Hot Water Runs Out Too Fast

A hot water system that runs out too quickly is often caused by sediment accumulation, a thermostat issue, or an undersized tank. Call our experts to troubleshoot the problem and restore reliable hot water flow.

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What Regulations Apply to Hot Water Systems in Australia

There are regulations around hot water system installation, temperature and safety across Australia. By law, hot water stored must be above 60°C to prevent bacteria but delivered below 50°C for safety. New NSW regulations require temperature control devices on all new installs.

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