Are you looking to upgrade your home heating system?
Do you have a diesel boiler or an electric heating system?
Are you concerned about rising power bills, and you are looking for a more energy-efficient way to heat (and cool) your home?
If this is you, or if you are interested in learning how hydronic heat pumps are transforming the way we heat, cool and supply hot water to our Australian homes, then this article is for you.
In this second article of our Homeowner’s Guide to Hydronic Heat Pumps and Hydronic Systems, we are looking at hydronic systems vs. diesel boilers or traditional electric heating systems.
Why Switch to a Hydronic Heat Pump? (Quick Answer)
If you’re still relying on an ageing boiler, a diesel heater, or a bank of electric panel heaters to warm your home, you may be spending far more than you need to and contributing far more to carbon emissions than is necessary.
Hydronic heat pump systems represent one of the most significant leaps forward in residential heating technology, combining the comfort of traditional water-based heating with the remarkable efficiency of modern heat pump engineering.
This guide will help you understand the differences between hydronic heat pump systems and conventional boilers, or electric heating systems, and why it might be the right upgrade for your home.
Let’s break it down.
Before we get going. If you are new to hydronic heat pump systems, check out our first article in this Series, What Is a Hydronic Heat Pump System? (A Beginner’s Guide for Australian Homeowners)
How Does Each System Work? (Simple Explanation)
1. Hydronic Heat Pump and System
The system uses heated (or cooled) water that is circulated through pipes to radiators, underfloor systems, or fan coil units to control the temperature in each room of your home. Hydronic heat pumps are also known as air-to-water heat pumps.
2. Diesel Boilers
Burn diesel to heat water circulated through pipes and radiators.
3. Electric Heaters
Use electricity to directly generate heat. These include electric water heaters, resistive heaters, electric radiators, or panel heaters.
These systems have been used in the past due to the technologies available at that time, however with the continued rise in energy prices, their poor efficiency, and high running costs make them ideal candidates for reconsideration. Cheaper running costs are not the only advantage hydronic heat pumps have. We’ll lay this out in more detail below.
Side-by-Side Comparison of Each System
| Features & Benefits | Hydronic System | Diesel Boiler | Electric Heater |
| Energy Source | Extracts thermal energy from outside air | Diesel combustion | Electricity |
| Energy Efficiency | Approx. 400% | 85%-90% | 100% |
| Running Costs | Low | Medium-High | High |
| Cooling Capacity | Yes | No | No |
| Installation Cost | High | High | Low |
| Future-Proofing Your Home | Very high (aligned with net zero goals) | Low | Low |
Energy Efficiency & Running Costs
Energy efficiency is where hydronic heat pump systems really shine.
Hydronic Heat Pumps Energy Efficiency & Running Costs:
✅ Are exceptionally energy-efficient, often delivering over 400% efficiency, meaning that they produce approximately 4 x the amount of energy that they consume. The Maxa 16 kW R290 heat pump delivers approximately 1 kW of electricity to produce 4.94kW of heat, delivering a COP (Coefficient of Performance) of 4.94.
✅ Reduce your monthly power bills. The Maxa 6 kW R290 heat pump is 80% more energy efficient than a traditional hot water system.
✅ Can deliver heating, cooling and domestic hot water all in one system.
✅ When paired with solar, or other renewable energy source and adequate battery storage, an R290 hydronic heat pump can help take your house off-grid.
Diesel Systems Energy Efficiency & Running Costs:
- Diesel boilers are expensive to run for two major reasons:
- They often have a low energy-efficiency rating, with a COP (Coefficient of Performance) between 0.75 – 0.95.
- The price of diesel has risen 63.3% in the last year (Source: GlobalPetrolPrices.com) and is projected to continue to rise, making diesel boilers and heating systems more and more expensive to run.
Electric Heaters Energy Efficiency & Running Costs:
- Including storage heaters are among the least efficient ways to heat a home, operating at a COP of 1.0. Replacing them with a hydronic heat pump system can yield dramatic energy savings.
If you’re heating or cooling an entire home, hydronic is often the most cost-effective over time.
Energy Efficiency & Running Costs
Hydronic heat pump systems not only provide energy-efficient and comfortable heating for your home, but they can also provide cooling during warmer months and domestic hot water. This means a single hydronic heat pump like the Maxa R290 range can provide for all your heating, cooling and hot water needs, reducing equipment costs and simplifying your home’s mechanical systems.
The table below shows the flexibility and features of a hydronic heat pump vs. a diesel boiler and electric heater.
| Features & Benefits | Hydronic System | Diesel Boiler | Electric Heater |
| Heating | Yes | Yes | Yes |
| Cooling | Yes | No | No |
| Domestic Hot Water | Yes | Yes | Yes (Separate system is required) |
| Solar Integration | Yes | Limited | Limited |
| Zoning | Yes | Yes | Limited |
Installation Costs
Hydronic Heat Pumps Installation Costs:
- The installation cost is high, however, hydronic heat pumps provide better energy efficiency, which help to reduce your monthly energy bills, creating a pay-back period over a number of years.
Diesel Boilers:
- High installation cost due to the required pre‑design, planning, installation, and commissioning.
Electric Heaters:
- The lowest upfront investment for installation.
Sustainability and Carbon Emissions
Hydronic Heat Pumps Sustainability:
- The energy efficiency of hydronic systems produces substantially lower greenhouse gas emissions than diesel or gas alternatives. As grids continue to decarbonise, the environmental case for heat pumps will only strengthen.
- Hydronic Heat Pumps like the Maxa R290 Hydronic Heat Pump Range use R290 refrigerant with an ultra-low global warming potential (GWP=3) and ozone depletion potential (ODP=0), making this one of the most sustainable choices on the market for heating, cooling and hot water.
Diesel Boilers:
- Diesel boilers burn fuel directly, releasing large amounts of carbon dioxide (CO₂), a major greenhouse gas driving climate change.
- Diesel combustion doesn’t just produce CO₂, it also releases harmful pollutants:
- Nitrogen oxides (NOx). Contributes to smog and respiratory issues
- Particulate matter (PM2.5). Linked to lung and heart disease
- Sulphur dioxide (SO₂). Causes acid rain and air quality problems
- These pollutants make diesel boilers particularly problematic in urban or residential areas.
Electric Heaters:
- While electric heaters and hydronic heat pumps both use electricity, the amount of electricity required is very different.
- Electric heaters need much more power to heat a home. This leads to higher indirect emissions, especially if the grid still uses fossil fuels
If you are interested in learning more about refrigerants and the benefits of R290 refrigerant, read this article.
In Summary. Is a Hydronic Heat Pump System Better than Diesel Boilers and Electric Heaters? Final Verdict: Which Should You Choose
Choose Hydronic If You::
- Plan to stay in your home long-term and want to benefit from the energy efficiency of hydronic systems and their pay-back period.
- Want heating, cooling, and hot water in one system.
- Want to reduce the carbon footprint and improve the sustainability of your home.
- Are building a new home or renovating and want to future-proof your home.
To Find Out More, Get in Touch
If you are an installer, homeowner, or business owner and you are looking for more information, contact our Next Cycle today and we will help you find the solution that meets your needs.
Next Cycle are hydronic heat pump, hydronic heating, cooling and domestic hot water experts in Melbourne and Victoria, New South Wales, Canberra and the ACT, Tasmania and Queensland.
Frequently Asked Questions (FAQ)
Common questions about hydronic systems
Q. Is hydronic heating more expensive to run than diesel or electric systems?
A. No. Hydronic heat pumps are highly efficient, reducing monthly running costs for your home vs diesel boilers or electric heating systems.
Q. Can I use hydronic to replace an old diesel boiler or electric heating system?
A. Yes. Modern systems like the Maxa heat pump range are a good replacement choice to future-proof your home.
Q. Does a hydronic system replace my hot water system as well as my air conditioning?
A. Yes. Many hydronic systems integrate domestic hot water.
Q. Can I install hydronic systems in an existing home?
A. Yes. Heat pumps, radiators and fan coils can be retrofitted into a home.
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