What is Hydronic Heating?
30th October 2024
With hot water recirculating through pipes and panels around your home, you could be enjoying energy-efficient warmth all winter long.
Hydronic heating, which warms your home using hot water or coolant, is renowned for its energy efficiency and the cosy warmth it creates. Let’s take a look at how it works and why it’s becoming so popular in Australia.
What is hydronic heating?
Hydronic heating efficiently distributes warmth throughout a building by circulating heated water from a boiler through sealed pipes to various heat emitters like underfloor heating or radiators. This method offers warmth without distributing dust or allergens.
How does hydronic heating work?
Hydronic heating systems operate by heating water in a boiler, which can be powered by various sources such as gas, wood fire, or solar energy. Once heated, sealed pipes carry the water to different rooms in the house, where heat emitters like underfloor heating, trench convectors, panel radiators or heated towel rails release the heat into the room.
Unlike conventional heating systems that blow hot air, hydronic heating releases radiant heat, which is then absorbed by objects around the room. This method not only provides efficient warmth but also eliminates the stirring of dust and allergens commonly associated with forced-air systems. Hydronic heating offers an efficient, silent and steady source of warmth during the colder months.
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Hydronic heating installation
Ideally, hydronic heating installation is done during the construction phase of building a home – so you can run the pipes through the walls and in the floors before they are sealed and finished. However with that being said, it is possible to retrofit hydronic heating, with the exception of installing underfloor heating into an existing slab.
Here are the essential elements for installing hydronic heating:
- A boiler unit and pump: There are regulations about where this should be situated in your home, as it needs good ventilation. You can shop around for the most energy-efficient model that suits the size of your house and your budget.
- Sealed pipes: These pipes will carry the heated water from room to room, passing the water through the various heat emitters. It’s important that these pipes are well insulated, so the water doesn’t lose heat as it travels to the heat emitters.
- Heat emitters: Options include panel radiators (which are affixed to the wall), underfloor heating (pipes that run under your floor), trench convectors (a panel that is inserted into the floor with a vent over the top) or towel rails. Your selection will depend on your home’s layout and budget.
- Thermostat: Most hydronic heating systems come with a thermostat (or two or three) so you can dial up or down the warmth in different areas of the house as needed.
Benefits of hydronic heating
Hydronic heating offers several advantages, including:
- Energy efficiency: Hydronic systems can be zoned, allowing you to heat specific areas of your home as needed which may reduce overall energy usage.
- Quiet operation: Unlike traditional heaters, hydronic systems operate silently.
- Safety: The panels generally get to around 75 degrees celsius.
- Reduced airborne allergens: There is no hot air being blown around the room, which means less dust, less cleaning and a cleaner, allergy-free environment.
While hydronic heating offers numerous benefits, there are a few drawbacks to consider. Firstly, the installation cost can be significant, especially when retrofitting it into an existing home. Additionally, hydronic heating systems only provide warmth and cannot cool your home during hot weather. Another factor to note is the delayed warm-up time, as it may take up to 30 minutes for hydronic heating systems to reach the desired temperature, resulting in a delayed response compared to some other heating methods.
How much does hydronic heating cost?
Because there are so many variants – the size of your boiler, the size of your house, the type of heat emitters you choose, the effort involved in installation, and so on – it’s hard to pin a cost to hydronic heating. As a very rough guide, for an average 3-bedroom house, you could be looking at up to $10,000 fully installed. It’s also important to note that there are no energy rating labels for gas hydronic heating in Australia.
Once installed, Sustainability Victoria estimates the annual energy cost for gas hydronic heating of a medium-sized house (160m2) to be between $1,657 and $1,814.
The final word
If you’re looking for a heating system to keep your home snug and warm in winter and control your allergies, then you could consider hydronic heating – a dust-free form of heating that can warm up your entire home.
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References
- https://www.yourhome.gov.au/energy/heating-and-cooling
- https://www.sustainability.vic.gov.au/energy-efficiency-and-reducing-emissions/save-energy-in-the-home/heat-your-home-efficiently/calculate-heating-costs
- https://www.sustainability.vic.gov.au/energy-efficiency-and-reducing-emissions/save-energy-in-the-home/heat-your-home-efficiently/choose-the-right-heating-system-for-your-home
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