Hydronic Heating Supplier

Frequently Asked Questions

The EN442 standard is a measuring standard that puts an end to a large number of different values that have previously been used and provides an accurate reference for comparing different appliances. The 75/65/20 system has been chosen for this reference value. This is a realistic starting point for choosing an appliance that provides sufficient heat with a low water temperature.

On exceptionally cold days, the water temperature may increase slightly, but for most of the heating season, it will be much lower. Since this fixed reference level is not always used in practice, we are also continuing to give the values for the traditional 90/70/20 system which we calculate according to the guidelines of the new EN442 standard*.

*This information has been reproduced courtesy of Jaga Belgium.


While the EN442 standard is the benchmark to which radiators should be manufactured, it is only one indicator for the end product. Be sure to insist on a radiator where you can be guaranteed that the country of origin is renowned for design, manufacturing quality, and minimising waste and harm to the environment.

This is why at Hunt Heating, we are committed to providing Australian homes with only the best products available, not only in accordance to the EN442 standard, but also in premium design, technological innovation, and environmental sustainability.

Radiant heating systems heat people and objects throughout the room, so you can feel the difference. It simply eliminates cold draughts and keeps the heat warming you and objects around you, not the air.

A hydronic heating system consists of five components:
  • The boiler heats water to a thermostatically controlled temperature. Boilers can use natural gas, LPG, off-peak electricity, or can be wood fired.
  • The piping, usually made of copper/plastic or multilayer and carries the heated water from the boiler to the radiators/ convectors, and back again for reheating.
  • A pump circulates the water through the piping.
  • Radiators or convectors transfer the heat into the room (several types of radiators and convectors are available).
  • Programmable wall thermostats ideally control the heat levels (or room temperature) to optimise comfort throughout the house.
Click here to find out more about how hydronic heating works.

Hydronic heating is one of the safest, most hygienic ways to heat your home. As it is radiant heat and there is no circulation of dust and allergens, hydronic heating is the ideal heating system for the elderly, children, and pets.

There is no danger of burning or scalding since the system is fully enclosed with radiator temperatures well below boiling point. However, the surface temperature of a radiator can be quite hot to touch, so care should be taken with anyone who may not be able to adequately feel surface temperature and react when coming into contact with the radiator.

Natural convectors are a safer alternative to radiators if required, as the surface temperature of natural convectors is pleasantly warm to touch, never reaching a higher surface temperature than that of a radiator.

Click here to find out more about the benefits of hydronic heating.

At Hunt Heating, we are experts in hydronic heating and cooling for all homes, existing, and new. Many Australian homes can be fitted with hydronic heating solutions any time of the year. While houses on a concrete slab may be more difficult to add a hydronic heating system due to lack of access for pipe work, it is possible to add hydronic heating nonetheless.

To install hydronic heating with radiators, the approximate cost is currently around $1,300 to $1,600 per radiator, fully installed, including the cost of a boiler in an average sized home.

To install hydronic slab heating, the approximate cost is currently $66 per square metre, single pour, not including the cost of the boiler. For a double pour, that is, a structural pour then screed poured, the cost is currently approximately $103 per square metre, not including the cost of the boiler.

Any variance depends on the difficulty of the installation process, individual specifications, and the size of your home.

A high-efficiency boiler is used to heat water which is then circulated throughout the system by a small pump. Each area can be individually controlled so only the required amount of heat is used. Our radiators are also rated to industry standard according to the area of the house in which they are placed; bedrooms are set to 18 degrees Celsius, hallways 20 degrees, bathrooms 23 degrees, and living areas at 21 degrees. This ensures a more comfortable and even spread of temperature across your home, allowing you to control the temperature of each room whilst saving energy.

There are two recognised measurements for heat output; BTUs (British Thermal Unit) and Watts. Within our brochures and product description on our website, you will find heat output listed by Kilowatt in the technical section by each appliance.

A thermostat should be installed in a main living area (usually the family room). This should be located on an internal wall if possible in an area free of draughts, and away from sources of direct heat, such as radiators or direct sunlight.

As will all heating, insulation improves the effectiveness by reducing heat loss through walls and ceilings. The boiler is not running as often for a given output, thus, saving on fuel bills.

If you live in an urban area, the cheapest fuel to use is natural gas. If natural gas is not available, LPG, Electric, or solid fuel boilers can be used, along with solar input.

Panel radiators are draught free, clean, and silent. They do not rely on noisy fans cycling on and off to provide you with the ultimate home heating. With hydronic heating, radiation and natural convection combine to produce a heating system that will exceed your expectations, both in the quality of heat and in its ability to provide uniform temperatures at the lowest possible relative humidity.

The electrical componentry in a hydronic system is minimal with wall hung boilers having an electronic ignition on startup and small economical pumps using very low amounts of electricity to operate.

There are many major distinctions between ducted and hydronic heating systems that you should be aware of before selecting the right system for your home. Ducted heating circulates and recirculates warm air using large electric fans. The air is scorched over burners then blown via ducts around your home, bringing with it airborne particles, dust, and other undesirable pollutants, all of which can be trigger factors for asthma and other breathing allergies.

Whether it be Ducted Air, Hydronic Radiator, or Hydronic floor heating, there are generally two basic parts to your heating system:

  1. The thermostat: this is in the house and turns the boiler or heater on or off; and
  2. The boiler or heater: this heats up the air, radiator, or floor.

Your thermostat ‘speaks’ to your boiler or heater to communicate when heat is required and supplies a signal for the boiler to start up. Once the thermostat has reached its set temperature, the relay then opens, turning the boiler off. You can hear the relay ‘click’ on and off when this happens.

When your heating doesn’t come on, the following checklist can assist with identifying the problem:

  • Read the operating instructions for the thermostat to make sure it is programmed correctly
  • Check that your boiler or heater is turned on
  • Check the batteries in the thermostat

Once you have inspected all the elements in the above list, check if there is a display on the thermostat, if not, your thermostat may be faulty.

If there is a display on your thermostat, but your heating is still not on, put the thermostat to manual and set the temperature above room temperature, which is anywhere between 25°C and 29°C. The heating symbol should then come on the screen and your heating should turn on. If this is the case, you may proceed to reprogram the thermostat.

If the heating symbol is visible on your thermostat, but the heating still does not come on, then there is a fault with either your thermostat or boiler. A heating serviceman will need to be called to fix your heating.

If the heating symbol is visible on your thermostat, reduce your operating temperatures.

If the heating symbol is not visible on your thermostat, either the battery needs to be changed, or your thermostat relay is faulty, or your boiler or heater is faulty. A heating serviceman will need to be called to fix your heating.

Ideally, the power (or kWs) should be slightly over the maximum required kWs calculated for the system. If the boiler is oversized, there is an excess consumption of fuel and the boiler will tend to frequently turn on and off, consequently resulting in wear and tear on the boiler as well as heat loss.

Use our Heat Load Guide to help calculate your room’s kW requirements.

Should you have a problem with your appliance, the following list of basic checks may help solve it:

  • Is the main electricity supply to the appliance switched on?
  • Is there sufficient water pressure on the boiler? Refer to user handbook for further details.
  • Are all the external controls, including time clocks and room thermostats, calling for heat?
  • Are all radio frequencies (room thermostats) paired with adequate battery power to call for heat?
  • Is the gas turned on at the meter and are all the other gas appliances in your home operating?
  • Have you contacted your installer to confirm the fault is attributed to the boiler?

If these basic checks are not made, it may result in an unnecessary visit from one of our engineers, for which a charge will be made to the value of $150 incl. GST. Remember, during the first 12-month warranty period, you should always contact your installer first.

Bleeding your radiators allows the air that is trapped inside to be released. It is important that all the air in the pipework, radiators, and boiler be removed when your heating system is installed.

Air trapped in your heating system during its operation should be removed by periodically checking. Allowing air to be trapped in the system will result in poor performance and premature failure of components within your heating system. The use of a boiler additive is recommended on all steel panel systems.

You can easily bleed your radiators yourself, by following these simple steps:

  • Switch off the heating system and allow the water to settle, preferably overnight.
  • Go to each radiator and turn the small air vent using a special air bleed key. You can purchase air bleed keys from our website. This little tool helps stop dirty water from marking carpets, floors, and walls. A built in reservoir collects the bleed water making the job super easy and fast.
  • Be sure to catch any water that bubbles out; the water may be black and dirty and could stain surfaces it comes into contact with.
  • As soon as the air bubbles cease, turn off the valve. It should not be necessary to run water from the radiator to clear the air.
  • Check for any automatic air bleed valves that may be in the system, in the boiler, or at any high points in the piping system.

Remember, a panel radiator needs a continuous flow of hot water to work effectively if the radiator is hot at the bottom but cold at the top, you will need to bleed the air out.

The heat output of a radiator is established using a calculation called a ‘delta t’, denoted as ‘Δt’. Based on the desired room temperature of 20°C and boiler flow temperature of 80°C and return flow of 60°C, European standards use Delta t50°C as a measurement. This is calculated using the following formula:

Outflow temperature – inflow temperature – desired room temperature

So in the example provided above:

80°C – 60°C – 20°C = Δt 50°C

Contact us to speak to one of our friendly hydronic heating and cooling experts to discuss your radiator heat output requirements.

We always recommend you choose radiators with a higher output that required as you can always turn them down and you will have the reassurance of additional heat during cold spells. Use our Heat Load Guide to help calculate your room’s kW requirements

Altering the size, shape, or number of tubes or columns in a radiator, you can adjust the output achieved. For example, the multiple columns of our Ancona product range provide huge flexibility in achieving the right output in a limited space.

We do not recommend that radiators or towel rails are placed in swimming pool environments due to the excessively corrosive nature of chlorine. In addition, radiators should not be located in areas that have long term exposure to high levels of moisture. When commissioning any radiator (including aluminium) on an indirect or closed system, we recommend using a suitably mixed metal inhibitor in appropriate quantities to protect against scale and corrosion.

Within our vast selection of radiator designs, many of our radiators are available in vertical or horizontal options to suit any space. You can maximise the use of high ceilings or long, low spaces without compromising heat output.

We also have single or double radiators available. Using models with additional rows of tubes or multiple columns maximises heat output within the same wall space. As an example of comparative heat outputs for single or double radiators, our Volcano single design measures 1471mm x 400mm at a 1kW output, and the double design measures 1471mm x 400mm at a 1.67kW output.

You can browse more of our products online.

At Hunt Heating, we pride ourselves on having the widest range of sizes, options, colours, and accessories so you have thousands of options to choose from. This means that you can have almost any radiator made to order so that it perfectly suits your space and your interior design whilst matching your heat requirements.

Many of our designs are also available in a large selection of RAL colours, that is, 188 internationally recognised pain colours, as well as special finished. To receive a copy of our RAL or Special Finish chart, contact us on 1300 00 1800.

Do note that due to the printing process and manufacturing tolerances, the colour of a finished radiator may vary from the colours that are presented in the brochure as well as the RAL and Special Finish charts. Colours may also vary from order to order, so it is wise to order all of your radiator requirements in one lot if you know how many you require in your overall heating system.

You can order your radiator in six easy steps:

  1. Confirm your Heat Output requirements, this ensures the radiators you choose will deliver the heat output you need.
  2. Choose your design. Our wide range of premium European designer products has all your requirements covered, from cast iron to modern feature radiators, including an environmentally friendly aluminium range, with an extensive choice of sizes, colours, and outputs.
  3. Select a size that matched your heat output requirements. Outputs are shown in the technical section of each product listing on our website and will help you and your installer to find the best match for your needs.
  4. Choose the colour you want. With over 200 colours and special finishes to choose from, our range of products will keep you warm in style, matching your home’s colour scheme or introducing a colour accent to create a striking feature.
  5. Find a valve. To complete the look, choose from our wide selection of valves and any accessory that complements your choice.
  6. Contact us to place your order!

Remember, our team of friendly consultants are only a phone call away, or why not visit us in person at our Showroom where you can step into a world of inspiration to touch, feel, and discover our incredible range of European designer products!

If you place an order to with us before 12 noon Monday to Friday and the product is to be delivered to a location within Victoria, we can deliver your product to you in as little as 24 hours, subject to product availability.

Bespoke and made to order products are usually dispatched within three days of receipt, allowing our logistics team time to inspect the bespoke product and packed ready for delivery.

Products for interstate delivery, outside of Victoria, are usually dispatched within three days of the confirmed order, dependent on delivery schedules, the item being in stock, and the order being placed prior to 3:00pm Monday to Friday.

Please note, many of our factories close for two to four weeks during the holiday periods of July/ August and December. This may extend the delivery period quoted for non-stock or made to order items ordered during July/ August and December/ January. For such orders, we will always confirm the expected delivery date on our order acknowledgement once your order has been placed.

At Hunt Heating, we are dedicated to providing you with unrivalled excellence in customer service and the best in premium quality products. Please refer to our Terms and Conditions for more information.

Should you have any further queries, or wish to discuss your order with a friendly member of our Customer Service team, please contact us.

If your radiator is leaking due to an issue that is not associated with installation, yes, we will replace your radiator. We may choose to replace just the damaged or leaking sections of a sectional radiator whilst ensuring it will still look, and work perfectly.

However, if your radiator is leaking from where the valves connect to the radiator or where the air vent is fitted, it is almost certainly an installation problem and you should call your installer to amend the issue. Alternatively, you may choose to contact us and we can put you in touch with our nationwide network of accredited installers.

Yes, we will replace all scratched, damaged, or imperfect radiators as long as they have not been installed and we are notified within two days of the signed delivery note. We would also ask that they are returned to us in their original condition and packaging.

At Hunt Heating, we pride ourselves on quality and environmental sustainability, which is why we require the return of the damaged item for quality checking and safe disposal of materials. A full credit cannot be given until the damaged radiator is returned.

It is important for all scratched, damaged, or imperfect radiators to be in their original packaging so that they are protected when they are being returned and so that we can also determine if they were scratched or damaged pre or post-delivery. Leaking radiators need not be returned in their original packaging, however, we would ask that they are packaged as well as possible for transport to prevent further damage prior to quality checking.

With stock items, a replacement will be dispatched from our warehouse using priority service. With products that have been made to order, we will endeavour to liaise with our manufacturing partners to reduce the production and dispatch lead time.

For further information on delivery, please refer to our Terms and Conditions or contact us to get in touch with a member of our Customer Service team.

We will invoice you to the full value of the replacement radiator and credit when a warranty claim is determined.

We can only process your warranty claim upon receipt of the radiator you are returning and will make no agreement in relation to return carriage or transport costs.

All stock orders can be changed or cancelled prior to dispatch with no charge. To cover admin and transportation costs, stock orders cancelled after dispatch will be subject to a minimum 15% restocking charge, as long as they are returned in their original packaging, original condition, and undamaged. However, for all made to order radiators, restocking charges are not applicable and deposits and monies paid are non-refundable.

At Hunt Heating, we are dedicated to providing you with unrivalled excellence in customer service and the best in premium quality products. Should you have any further queries, or wish to discuss your order with a friendly member of our Customer Service team, please contact us.

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