Skyline Energy - 21st Century Ecological Solutions
Skyline Energy - 21st Century Ecological Solutions Skyline Energy V25ZA Hydrocarbon Hydronic Heatpump Skyline Energy SX-13CCZA Hydrocarbon Heatpump Skyline Energy V35 Hydrocarbon Hydronic Heatpump Skyline Energy SX-24ZA hydrocarbon air sourced heatpump SSkyline Energy SX-19ZA Hydrocarbon Hydronic Heatpump

Established 1999

Hydronic Heating - Heat Pumps - Solar Electricity - Solar Battery Systems - Sanden Hot Water

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Hydronic Heating

   * SX-18ZA and SX-19ZA
   not suitable for frost prone areas

Other Hydronic Components




Our Air Sourced Heat Pumps are 200% to 600% efficient, in OZ

Heat Pump Efficiency

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1300 552 976

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ZA Hydrocarbon Hydronic Heat Pumps = 33% more efficient than other brands

After 15yrs of innovation, research and development, our latest ZA heatpumps are in a class of their own! Skyline Energy heatpumps are available from all leading hydronics specialists - INSIST ON THE BEST - don't let an inferior performing heatpump steal the heat from your system . . .

    ZA Hydrocarbon Heatpumps blow the competition into the weeds with higher C.O.P.'s

Hydronic Heat Pump
Simply a very efficient way to heat your home
  • Awesome performance and efficiency - Now with ZA serrated-edge "Owl-wing" super-quiet, super-efficient, high airflow fans
  • Designed, individually tested, fine-tuned, and supported locally by Skyline Energy and our independant agents
  • Hydrocarbon charged - more efficient than standard refrigerant charge, and less wear & tear on the refrigeration system
  • No inefficient back-up element required
  • Copeland Scroll compressors
  • Automatic defrost
  • Easy installation - control system already set up for plug'n'play!
  • You can depend on our 15yrs+ experience

Skyline Energy SX-13CCZA Hydrocarbon Hydronic Heatpump
Performance Chart - C.O.P. includes 300W primary circ pump:

C.O.P. of up to 5 at 10C ambient air temp - much higher than any other hydronic heatpump

Skyline Energy SX-13CCZA Hydronic Heat Pump

Panel radiators and heatpumps ? YES!

We have the experience AND the heatpumps!

Skyline Energy:
  • produce, supply, and install hydrocarbon-charged heatpumps specifically manufactured for Hydronic Heating
  • design and supply complete hydronic heating kits for plumbers to install
  • can design, supply and arrange installation of hydronic heating in some areas
  • installed our first air sourced heatpump in 2002
  • installed our first hydronic heatpump system in 2005
Trade Supply:

All of our hydronic heatpumps/buffertanks/pumps etc. are available to all hydronics installers. Simply ask your builder or hydronic installers to quote on Skyline Energy heatpump systems

If you are an owner/builder we can provide a complete design and any or all components for you and your trades to install

Simply call 1300 552 976 for more information or send us an email

Simplified rules for sizing your heatpump for . . . . . MAXIMUM EFFICIENCY AND SERVICE LIFE!

  • Calculate how many kW are required
  • Look at the climatology of the location to establish the duration of 0oC to +4oC. Donít just look at the extreme temps, look at the mean overnight temp and duration
  • If the ambient air temp rarely dips below +4oC or does so for short periods then you can use this simple calculation...
    3.3x electricity input kW = heatpump output (ZA hydrocarbon models) kW to size the heatpump.
  • If the mean overnight ambient air temp is between 0oC and +4oC change the calculation to 2.5 x electricity input kW = heatpump output (ZA hydrocarbon models) kW to size the heatpump.
  • A more powerful heatpump will raise the water temp more rapidly so it will cycle off before it needs to defrost, thereby maintaining a higher COP and efficiency.
  • If your building has very poor thermal efficiency (leaks heat energy) this will lead to longer running time increasing the likely need for defrosting which leads to higher running cost.
  • Skyline Energy Hydrocarbon heatpumps do not modulate output like gas boilers, so it is also important not to oversize which will cause short-cycling. Generally it is not necessary to increase the water storage capacity beyond 100Lt to 400Lt. (greater water storage can work against you in the shoulder periods where heating may not be required for more than a few days, as you need to reheat ALL the water in order to be able to use it)



Super Efficient Super Quiet Ziehl-Abegg Owlett Fan

Home Heating with Radiant Floor Heat vs Forced Air

Why is radiant floor heat better than forced air heat (ducted/aircon)?
It is more comfortable, more energy efficient, provides a healthier environment and is more aesthetically pleasing.

Radiant Heating is Comfortable Heating!
Comfort is hard to define and is best understood as the absence of discomfort. Perhaps the most remarkable thing about radiant floor heat is what you won't notice. There are no forced air registers to see. No noise or dust from mechanical blowers. No hot air blowing on you. No hot air collecting at the ceiling, wasting energy. No cold floors to chill your feet. The mild warmth of a radiant floor is a subtle experience and always feels just right

Radiant Floor Heat Saves Energy
It takes less energy to heat a home with radiant floor heating than a forced air system

Radiant Heat is Healthy Heat
Forced air systems not only blow hot air, they also push allergens, dust and other airborne particles around your home. Improved indoor air quality can reduce allergies, medical bills, incidences of asthma and more. European studies indicate that dust mite populations are reduced as much as 90% in radiant heated homes. A quiet, peaceful environment, devoid of noisy fans and blowers, is a healthier and more relaxing environment too.

Sanden Heat-pump Hydronics ?

Were you sold a Sanden heat-pump system for hydronics?

We have been contacted numerous times by customers who were ill-advised and were sold hydronics systems running from multiple Sanden Heat-pumps. (not by us) Unfortunately, most of these systems were undersized, (THE SANDEN DOES NOT PUT OUT 4.5kW IN LOW AMBIENT TEMPERATURES) working the Sandens far beyond their design capabilities, systems never working properly, and leading to premature failure of the heat-pumps.

Sanden heat-pumps are great for potable hot water, and if they had been sized correctly may have coped as hydronic heat-pumps even though that was never their intended application.

If you are such a customer, we can help you try correct the situation, and replace the Sandens with an adequately sized Skyline Energy hydronic heatpump. You may be able to re-use the tank and one of the heat-pumps for dedicated potable hot water, and recoup some of the original cost of the other heat-pumps.
For more information please >>contact Skyline Energy<<.

Changing from GAS/LPG to heatpump - for panel radiator systems ?

Heatpumps have lower water temperature than a gas boiler - but it still works!

The heat output of a panel radiator is based on the entering water temp, the room temperature, and the water flowrate or exiting water temperature.
Gas boilers can generally output water up to about 83C but to retain good efficiency we usually run our heatpumps to max of 55C. (the hotter we push the water the lower the efficiency)
Radiator manufacturers usually state the output of their radiators based on 80C entering temp, 60C exit temp, and 20C room temp.
At 55C/45C/20C for heatpump the panel radiator output would be roughly half.

Boilers modulate the gas flame, from max output to about 15% before turning off. They cycle on and off as required. When the house reaches the set temperature the system switches off until the temperature drops, then cycles back on usually at max flame before modulating.

What all this means is you can put a 30kW gas boiler on a 20kW heatload, it will quickly heat the water to its set temp (80C) then modulate, the water will be flowing through the rads at 80C and heat the house quickly up to temp, then cycle off.
(On most boilers you can program the water output temperature. If you can do this on yours, you could try turning it down to 55C and see how it performs)

Our heatpumps do not modulate but they do cycle on and off according to the house temp. If you change to a 55C heatpump it will take longer to heat the house because of the lower output of the panel radiators, but it will get there as long as the house does not lose heat faster than the panel radiators can heat it.
If the response from the heatpump is too slow, you could consider adding extra radiators where necessary.

Some heatpumps are advertised as hi-temperature heatpumps, but running them at 70C instead of 55C would drive down the efficiency to the extent that power usage would be far higher.

For more information please >>contact Skyline Energy<<.

Air Sourced Hydronic Heatpump

Suitable for:

Skyline Energy SX-17CC air sourced hydronic heatpump
  • Slab Heating
  • Under Floor Heating
  • Radiator Panel Heating
  • Full replacement for, or booster for:
    poor performing Solar hydronics
    old wood/electric/oil hydronics
    uneconomical LPG/GAS hydronics

The age of GAS is over

Skyline Energy SX-17CC air sourced hydronic heatpumpSkyline Energy SX-17CC air sourced hydronic heatpumpSkyline Energy SX-17CC air sourced hydronic heatpump

Download datasheets for:

SX-06SX-08SX-10,  1x compressor 240v, single fan, side-discharge,
SX-11CCZASX-13CCZASX-15CCZASX-17CCZA,  1x comp 240v dual fan, side discharge
(NOTE: V-Evaporator models are better suited for larger heatloads in frost prone areas)
SX-20BZASX-24ZA,  dual compressor 240v, 1ph or 2ph, dual fan, top discharge
V20ZAV25ZAV30ZAV35ZA,  V-EVAP, dual compressor 240v, 1ph or 2ph, dual fan, top discharge

bare heatpumps available from A$3,900 incl GST

NOTE: Larger air-sourced heatpumps may not be suitable if sound-level is a factor

(buffertank, circulating pumps etc. not included)

Trade Pricing & support also available

Skyline Energy - Experts in efficiently heating water:

Don't kid yourself!

We see all sorts of ideas and formulas typically on forums about heating homes with solar tubes and fancy tanks, but in the end we see disappointing systems that don't do what they are supposed to do - keep you warm in winter!

Be realistic right from the outset, it takes a lot of energy to keep a house warm, and if you are worried about the initial heating system costs and ongoing running costs BUILD/MOVE TO A SMALLER HOUSE . . . .

We research and offer the most cost-efficient water heaters for winter hydronic heating.

Natural GAS prices are set for drastic increase

If you don't have Natural GAS or don't want to use Natural GAS, the optimum system if you have the power to drive it, is an appropriately sized, dedicated Air-Sourced Heat-Pump! - Add solar electricity if you can. You can forget Geothermal systems unless you want bragging rights on how much money you wasted.

Air-sourced+Solar Electricity = lower initial cost and lower running cost than Geothermal

Skyline Energy Hydrocarbon Hydronic Heat Pumps:

Hydrocarbon vs conventional refrigerant:
Our considerable and comprehensive in-house research and development tests, backed by independant industry experts, have shown that the performance difference offered by hydrocarbons over conventional refrigerants can be up to about 20%, AND reduces wear and tear on the components!

  • Perfect for Hydronic Heating
  • High Efficiency 'Solar' Hot Water
  • Can be offset with Solar Electricity
  • Can be the back-up for wood-boiler instead of an element
  • Can replace a poor-performing solar-hybrid hydronics heater
  • Can replace an expensive to run LPG hydronics boiler

Hydronic Heating systems - Never be cold again

hydronic heating If you've ever experienced the luxury of a heated floorslab, or stepping from the shower into a warm towel, on a cold winters day, you'll know why Hydronic Heating systems are becoming very popular.

There are no drafts from forced air movement, you are just gently bathed in a warm environment. It's safe for all the family and great for people with allergies.

Water can be heated by GAS, LPG, Wood, Solar,   Ground-Sourced (Geothermal) Heat Pump, Water-Sourced, Air Sourced Heat Pump, or even a combination of one or more of these. For Australian conditions we generally recommend Air Sourced Heat Pumps as they provide the greatest overall control, sustainability and cost efficiency compared to straight GAS, LPG, Wood, and electric systems.

Skyline Energy pioneered the use of air sourced heat pumps for hydronic heating and continue to lead the field. Although our research shows that Evacuated Tube Solar provide very little additional heat for hydronics use, we will integrate them if you already have them!


Heat-pump running cost less than GAS and far less than Electric or LPG

Electricity AND GAS prices are constantly rising, and solar electricity costs continue to fall, so although installing an air-sourced electric heat-pump will cost more initially, there will be significant cost savings over time.

There are lots of factors that affect the COP of a heat-pump under the required conditions:

  • The design and innovation of the heatpump - they vary greatly!
  • The gas/refrigerant used
  • The ambient air temperature
  • The starting or returning water temperature
  • The water flow rate
  • Local voltage fluctuation
  • The input kW will also vary with the other variables

There is no such thing as "over-unity", energy in must equal energy out. The MAGIC is where the energy-in comes from and how efficiently it can be harnessed.

The Coefficient of Performance (COP) is simply a way of measuring the efficiency of something. It is the ratio of energy in vs energy out. A COP of 3 means 3x units of energy out for 1x unit in. In our case with air-to-water heat-pumps, the difference in the numbers is the energy harnessed from the air - at COP=3, 3kW of heat energy out comes from 1kW of electricity in, and 2kW of "solar" (heat) energy in, from the air.

All Skyline Energy Air Sourced Hydrocarbon Charged Hydronic Heatpumps are fine-tuned individually for MAXIMUM C.O.P. efficiency!

Why don't we state the output in kW ?

The kW output of ALL air-sourced heatpumps is a variable. It would be misleading to state the kW output without listing all the other variables, input kW (itself a variable!), returning water temperature, ambient air temperature, water flow rate, refrigerant type - and even local voltage fluctuations.

Heat Exchangers

If you want to use your heat-pump/boiler to heat your pool as well as your house, you will need an external heat exchanger
We offer a range of "shell and tube" heat-exchangers in two types, Titanium heat-exchangers and 316 Grade Stainless Steel heat-exchangers. (also suitable for a wide range of other commercial/industrial applications)

heat exchangers heat exchangers

If you are completely off-grid, AND/OR you:

  • Have access to about 4000Lt of waste oil per year,
  • and, you don't mind getting your hands dirty

Then perhaps a waste oil burner for hydronics could be a good alternative solution for you.

Current technology waste oil burners are surprisingly environmentally friendly, but they do require maintenance involving cleaning etc. and handling of the waste oil, so they are not for everybody - ideal for a technically minded user like a car mechanic, tradesman etc.

They typically use about 3 to 4 litres of oil per hour.



Skyline Energy Air Sourced Hydrocarbon Heat Pump

SX-06 for MAX 60sqm slab
  (or for 50sqm RADs)
SX-08 for MAX 80sqm slab
  (or for 65sqm RADs)

Skyline Energy Air Sourced Hydrocarbon Heat Pump
SX-10 for MAX 100sqm slab
  (or for 75sqm RADs)

Skyline Energy Air Sourced Hydrocarbon Heat Pump
SX-11CCZA for MAX 110sqm slab
  (or for 90sqm RADs)
SX-13CCZA for MAX 130sqm slab
  (or for 100sqm RADs)
SX-15CCZA for MAX 150sqm slab
  (or for 120sqm RADs)
SX-17CCZA for MAX 170sqm slab
  (or for 130sqm RADs)

Skyline Energy Air Sourced Hydrocarbon Heat Pump
SX-20BZA MAX 200sqm SLAB
  (or for 160sqm RADs)
SX-24ZA MAX 240sqm SLAB
  (or for 200sqm RADs)

Skyline Energy 20kW Air Sourced Hydrocarbon Heat Pump
V20ZA MAX 200sqm SLAB
  (or for 160sqm RADs)
V25ZA MAX 250sqm SLAB
  (or for 210sqm RADs)
V30ZA MAX 300sqm SLAB
  (or for 260sqm RADs)
V35ZA MAX 350sqm SLAB
  (or for 300sqm RADs)




Skyline Energy Stainless Steel Buffertank

Water-flow rate through the heat exchanger in the heatpump is critical to efficiency and usually higher than required through hydronics, so a buffertank is essential.

Skyline Energy Expansion Tank Sub-system


An appropriate capacity expansion tank, pressure relief valve etc is required on all pressurised hydronics systems.

Skyline Energy offer a range of high quality competatively priced hot water circulating pumps.

Rialto WiFi Hydronics Thermostat

Now you can manage your home hydronic heating from your smartphone and/or tablet

Skyline Energy Cold Climate heatpumps are the trusted name in hydronics throughout Australia, and despite what you may have heard can efficiently heat water hot enough for hydronic heating radiators and towel rails!

With predictions of sharply rising electricity AND GAS prices, Skyline Energy's unique Air Sourced, hydrocarbon charged, Ziehl-Abegg "owl" fan Heatpumps AND Solar Electricty offer the most cost-efficient long-term solution.



Warning: Never buy a heat-pump that has an electric element - check first!

Hydronics and potable hot water (2-in-1 & 3-in-1) Heat Pump Systems

Hydronic Heating - Potable hot water heating - AND Refrigerated Air-Conditioning (Cooling) all from the same unit, sounds too good to be true . . . maybe it is!
Sizing a heat-pump to do hydronic heating AND potable hot water means increasing the size of the heat-pump to cater for both applications without compromising either one, and increasing the complexity of the system. We think its false economy, and recommend seperate potable hot water unit using either a Solar-Boosted LPG (FOR OFF-GRID ONLY), or high efficiency heat pump
Electric back-up elements totally destroy the efficiency of a heat pump. To make-up for an undersized heat pump, AND to maintain the potable hot water temperature, some combined units can use up to 3x 3kW electric elements for heating!

hydronic heating

Some want a wood-fired hydronic system:

Heat Pump Wood Boiler back-up System

Instead of the traditional electric element backup, why not use a heat-pump that will provide the same (or more) energy but consume 60-70% less electricty!

How does this work

The wood boiler system heats water in a storage tank which supplies the hydronic panels or floorcoils with hot water. When the fire dies down and the water starts to cool, and if the hydronics needs more heat, the control system will fire-up the heat-pump to replace the heat from the fire. Once the water in the tank reaches its optimum temperature, (with or without a rekindled fire) the heat-pump is automaticay switched off.

Best of both worlds

Sizing the heat Pump depends on whether you want just boosting, (a small heat pump like the SX-07) or a heat pump that gives you the flexibility to use either wood or dedicated heat pump whenever you want.

Do you want to lower your energy bills?

1. >Solar Electricity< - With or without battery systems

Solar technology continues to leap forward with inteligent inverters that "learn" your power usage patterns and self adjust to maximise the benefits from battery systems, they even use your internet connection to access weather forecasts to predict solar yield and decide whether to charge from low-cost off-peak/time-of-use tarifs - its all about maximising solar self-consumption. We've have done the training and have the expertise to advise which system is right for you, and all you need to do is enjoy the results from the system.

2. >Solar Hot Water?< - Sanden Hot Water Heatpump

Skyline energy installed our first heatpump hot water service in 2002. Since then we have installed thousands. We have not supplied any rooftop "solar" hot water systems for years!

3. >Home Heating< - Hydronic heating - Simply the best

Skyline Energy is the undisputed leader in the field of hydronic heating with heatpumps, and our continuous R&D program ensures we stay at the top. Let us exceed your expectations!

solar electricity
solar energy management

Solar Electricity with Battery Storage

Traditional solar inverter systems do not have capacity for *storage,so the excess solar energy you generate is lost back to the grid. With no stored electricity in reserve, when the sun goes down you have to sourcepower from the grid.
*(storage can be added later but a replacement or additional inverter will be required)

Redback inteligent inverters

Skyline Energy can offer you the state-of-the-art Redback "hybrid" Inverter masterminded by Australian solar experts! with >Lithium Battery Technology<

Inteligent technology that gives you the power to store, monitor and manage your home’s solar energy all in a compact, elegantly design unit mounted either inside or outside your home.

You can also upgrade your existing solar system !

Tesla Powerwall
Tesla PowerwallTesla PowerwallTesla Powerwall

>Redback Inverters and Lithium battery technologies<

Redback inverters can also be coupled with a range of other battery technologies, such as LG Chem Lithium, Pylontech Lithium etc.

Redback have developed a matching battery storage cabinet to house Lithium batteries, with inbuilt cooling fan to keep batteries cool, and can be installed inside or outside.




>Tigo solar panel optimizer <

The overall output of traditional, single-inverter type solar electricity systems can be compromised by partial shading and aging or underperforming of individual panels. The Tigo Optimizer maximises the output of each solar panel in your system.

This is done by making solar panels run independently of each other, so one panel is not dragged down by the shade, soiling or mismatch of the other panels.This increases the overall output of your solar system. Safety is also increased, as the Tigo optimizer deactivates the panel in any unsafe situation.

Tigo retrofitted to solar panelsTigo retrofitted to solar panels

Solar Hot Water - Harnessing free energy from the sun - even in the dark!

Save Energy, Save Money, with the best - >Sanden ECO and ECO PLUS Air Sourced Heat Pump<

Offset your air sourced heat pump hydronics running costs with >Solar Electricity<

Make that call today - 1300 552 976

The solar hot water systems we're all used to seeing on the roof, are not always the best environmental solution!
The >Sanden ECO< heat pumps are whisper quiet & extremely efficient, using a small amount of energy to collect the abundant heat that the sun puts into the air we breathe, and may be the overall best system for your specific situation. Industry leading performance means higher rebates are available for our heat pumps.

Why we don't recommend Evacuated-Tube systems:

The Solar/GAS age is over, and electric element boosters are inefficient, and . . . .

>Victoria State Government homeowner guide to sustainability (PDF)< page 4, table 1.1, supports our claim that heat-pumps can have a significantly lower lifecycle carbon footprint than solar-boosted electric systems:

  • avge heat pump produces 23 tonnes CO2 emissions
  • avge solar-boosted electric produces 33 tonnes CO2 emissions

In other areas results may vary, but in almost all conditions, Sanden 'ECO' Plus heatpumps will outperform most other heat-pumps and even solar boosted electric systems.

Save your roofspace for Solar Electricity, and install a heat-pump on the ground - higher return on investment.

Sanden Accreditation

The Sanden ECO plus is the perfect companion for your Skyline Energy Hydronic Heatpump

Conventional Solar-Boosted Electric Hot Water systems actually rely on inefficient Electric-Element boosters - especially when you need it most IN WINTER!

A >Sanden ECO PLUS heat pump< will:
  • NOT put you at risk
  • ensure your water ALWAYS reaches and maintains safe temperature
  • kill or prevent harmful bacteria
  • save you money
You don't have to worry about leaving the booster off - there isn't one.

The Sanden ECO Plus high efficiency, long life stainless steel heat-pumps are accredited for solar rebates, nothing on your roof, robust, more efficient, and simple to install.

Regardless if you currently have an off-peak electric hot water service, or a GAS hot water service, upgrade NOW - to one of our sensational heat-pumps (and solar electricty to drive your heatpump and your other appliances!)

>Sanden ECO PLUS heatpump< energy saving 80%* and therefore eligible for highest energy saving STC 'solar' rebate of any heatpump

No electric element, and whisper quiet at only 38dBa!
* calculated using Australian Office of the Renewable Energy Regulator (ORER) methodology

More info

Solar Hot Water - no roof panels

Eligible for all solar rebates*

Sanden ECO plus is the perfect companion to your Skyline Energy Hydronic Heatpump

Save your roofspace for Solar Electricity, and install a >Sanden ECO PLUS < water heater on the ground for a much higher return on investment than electric solar hot water systems.


Siddons Solarstream and other split-system heatpump replacements and new systems:

Skyline Energy SX-02 Hydrocarbon heatpump replacement for Siddons Solarstream 327-SS and 264-SS Hot Water units Skyline Energy SX-02 Hydrocarbon heatpump replacement for Siddons Solarstream 327-SS and 264-SS Hot Water units
Skyline Energy SX-02 Hydrocarbon heatpump replacement for Siddons Solarstream 327-SS and 264-SS Hot Water units

  SX-02 and SX-03GT Hydrocarbon
  replacements for
  Siddons Heatpumps

  SX-320 and SX-640GT Hydrocarbon
  hot water heatpumps with patented
  micro-channel condenser

The Siddons Solarstream 327-SS, 264-SS, and 417-SM heatpumps were amongst the most successful hot water units in Australia.

Skyline Energy was one of the first Siddons dealerships, and we supplied our first Siddons Solarstream heatpump in March 2006. Since then thousands have been sold. Siddons Solarstream stopped manufacturing them about 4 years ago.
The "Everlast" 316 stainless steel tanks they used are almost indestructable but some of those heatpumps are getting a bit tired now, so Skyline Energy now offer new, "improved" replacements for those old heatpumps - >SX-02< Hydrocarbon replacements, and >SX-03GT< Hydrocarbon units with more powerful compressor.
The performance difference offered by hydrocarbons over conventional refrigerants can be up to about 20%, AND reduces wear and tear on the components!

We will also be releasing a 320Lt >SX-320< Hydrocarbon and 640Lt >SX-640GT< Hydrocarbon complete hot water systems.
These new systems have Stainless Steel inner tanks like the old Siddons, with a new patented micro-channel condenser clamped around the tank, and of course the benefits of the hydrocarbon heatpumps.

GAS/Solar Hot Water systems:



       "Rediscover Reality"

Skyline Energy - 21st Century Heating Solutions