Why Replace Your Hot Water Service with a new era Heat Pump?

ECO Heat Pump Hot Water Unit Installation

Our team at Doherty Plumbing Solutions recently completed the installation of an ECO heat pump hot water unit at our customer’s home. First, we prepared a solid base by removing topsoil and creating a concrete pad for precast slabs, ensuring a stable foundation. The unit was expertly installed with a slight tilt back against the home for optimal performance.

We disconnected the old gas hot water unit and took the necessary safety measures by capping and sealing the connection points. To enhance efficiency, we extended the cold water supply feed to the new unit using a duo valve and insulated the piping.

For a central hot water supply, the hot water lines are extended under the home, utilising double-insulated piping for added energy savings. During the installation, we also addressed a burst copper pipe near the garden tap, replacing the damaged section promptly.

To meet compliance requirements, we connected the water supply to the new unit and managed the PTR (Pressure and Temperature Relief) drain appropriately. Our commitment to quality culminated in the assurance of a Compliance Certificate for the customer’s peace of mind.

At Doherty Plumbing Solutions, we take pride in delivering professional, industry-standard plumbing solutions. This project exemplifies our dedication to excellence and our commitment to providing efficient and reliable services to our valued customers.


If you’re considering upgrading your hot water system, a heat pump may be an excellent choice. Heat pump hot water systems are energy-efficient, environmentally friendly, and can provide significant cost savings in the long run. However, it’s essential to have this advanced technology installed by a professional plumber for several reasons. In this article, we’ll delve into how heat pumps work, the different types available, the pros and cons of heat pump water heaters, and the potential government rebates in Australia.

How Do Heat Pumps Work?

Unlike traditional electric or gas water heaters that generate heat directly, heat pumps transfer heat from the surrounding air to heat the water.

new heat pump installation replace hot water service

Here’s a simplified breakdown of the process:

  1. Heat Absorption: The heat pump unit contains a refrigerant that evaporates at low temperatures. It absorbs warmth from the air through an evaporator coil, even in colder conditions.
  2. Compression: The refrigerant is then compressed, which increases its temperature significantly.
  3. Heat Exchange: The hot refrigerant passes through a heat exchanger, where it releases its heat energy to heat the water.
  4. Circulation: The heated water is stored in a tank for later use.

This heat transfer process is highly efficient and consumes much less electricity compared to traditional systems.

Types of Heat Pumps

There are a few different types of heat pumps used in hot water systems:

  1. Air Source Heat Pumps: These are the most common and use ambient air to extract heat. They work well in moderate climates.
  2. Geothermal Heat Pumps: Also known as ground source heat pumps, they use the stable temperature of the ground to heat water. They are highly efficient but require more extensive installation.
  3. Hybrid Heat Pumps: These systems combine a heat pump with a traditional heating element. They can switch between the two based on energy efficiency and demand.

Pros and Cons of Heat Pump Water Heaters


  1. Energy Efficiency: Heat pumps are incredibly energy-efficient, often using up to 65% less electricity than traditional electric water heaters. This can lead to substantial cost savings on your energy bills.
  2. Environmentally Friendly: Due to their lower energy consumption, heat pumps produce fewer greenhouse gas emissions, making them an environmentally responsible choice.
  3. Long Lifespan: Heat pump water heaters typically have a longer lifespan compared to traditional heaters, potentially lasting up to 15 years or more.
  4. Lower Operating Costs: While the initial installation cost may be higher, the lower operating costs and potential energy rebates can make heat pumps more cost-effective in the long term.
  5. Versatility: Heat pumps can operate in various climates and can be a reliable source of both hot water and space heating.


  1. Upfront Cost: The initial purchase and installation cost of a heat pump water heater can be higher than traditional units. However, this cost is often offset by energy savings over time.
  2. Space Requirements: Heat pump units require more space for installation compared to conventional water heaters, making them less suitable for compact areas.
  3. Noise: Some heat pumps can generate noise during operation, which may be a concern if the unit is placed close to living spaces.
  4. Climate Dependent: Air source heat pumps may be less efficient in extremely cold climates. Geothermal heat pumps are more consistent but can be costly to install.

Government Rebate in Australia

In Australia, various government initiatives and rebates aim to encourage the adoption of energy-efficient technologies, including heat pump hot water systems. One such program is the Small-scale Technology Certificate (STC) scheme. Under this scheme, you may be eligible for financial incentives when you install a renewable energy system, including heat pumps.

The number of STCs you receive depends on factors such as the location, type of heat pump, and its energy efficiency. These certificates can then be traded or sold to recoup some of the upfront installation costs, making heat pumps a more attractive and affordable option.

Reasons to Choose Professional Installation

It’s crucial to have a professional plumber handle the installation for the following reasons:

  1. Proper Sizing: Professional plumbers have the expertise to determine the right-sized heat pump for your household’s hot water needs. An incorrectly sized unit can lead to inefficiency and higher operating costs.
  2. Correct Placement: Placing the heat pump in the right location is critical for optimal performance. Professionals can assess the best spot, whether indoors or outdoors, and ensure proper ventilation.
  3. Electrical Connections: Heat pump water heaters require electrical connections. Professional plumbers are trained to handle these electrical connections safely and in compliance with local regulations.
  4. Refrigerant Handling: Handling refrigerants safely is essential for the operation of a heat pump. Licensed plumbers have the necessary qualifications to work with refrigerants, ensuring your safety and environmental compliance.
  5. Warranty Protection: Many manufacturers require professional installation to validate the warranty on the heat pump. DIY installations may void the warranty, potentially leaving you responsible for repair costs.
  6. Efficiency and Performance: When a heat pump is correctly installed, it operates at its peak efficiency, providing you with the maximum energy savings and hot water supply.
  7. Safety: Safety should always be a top priority. Professional installation minimizes the risk of accidents during and after installation.

Opting for a heat pump hot water system can offer significant advantages, from energy savings to environmental benefits. To fully realise these advantages, it’s crucial to have a licensed plumber handle the installation. Additionally, exploring government rebate programs in Australia can further offset the initial costs, making the switch to a heat pump an attractive and sustainable choice for your hot water needs.

Our team of skilled and licensed plumbers understands the importance of providing a environmentally friendly source of hot water and keeping your living costs down. We’re here to chat with you and come up with affordable and practical solutions to replace your hot water service.

Eager to see where you can start saving on the energy $$$? Check out our various locations in Melbourne right here: [Click here]


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Reach out to chat with our friendly team at Doherty Plumbing Solutions today.


(03) 9877 5775

0417 577 432

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    As someone who has not had much luck in finding a good plumber in the past, I decided to give DPS a go. From the initial phone call, service was terrific. My plumber, George, arrived on time, was polite, patient & completed the job really well. Would recommend them & use them again, if needed. Pricing was reasonable too.
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    Nunzia Fiore
    Highly recommended 10/10. On time . Courteous guy , friendly and polite. In lead up to him arriving I was kept in the loop during the whole process. Cost I was amazed it was so reasonable. Being screwed in the past by tradesmen this plumbing service made me realise honest tradesmen are still around. Thanks. Guys.
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    Gazza East Melbourne
    Second time I've used doherty's, first did full storm water drainage, second new hot water system. Great work from the whole team both times. Definitely will use again and also recommend them.
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    Michael Prince
    For reliable plumbing services, call 03 9877 5775 or 0417 577 432