The burner used on the Saturn Oil Boiler range is manufactured in the same plant as the boiler itself – KD Navien. This  is a unique downward firing burner, with one simple adjustment for test and commissioning, the air damper. This downward firing burner is used all over the world through KD Navien products and it is highly efficient as well as dependable as part of a long-life oil boiler.

Per the brochure and installation manual, both external and boiler house models share the same internal components per kW sizing.

25B/E = Danfoss© 0.60/60° EH

30B/E = Danfoss© 0.75/75° ES

41B/E= Danfoss© 1.00/80° EH

1″ BSP tappings are accessible from each side of the boiler, leaving flexibility for the installer to choose which side works best.

As an open flued appliance, a single skin 75mm flu is used with out boiler. Available through your local merchant.

Standard Low Level Flue Kit = 1.5m kit including test port, 2 bends and termination piece

External (cabin pack model) = termination piece

Max flue lengths – 7m vertical – less 1m per 90° Bend

Flexible flue conversion kits are available at 6 and 12 meter sections

In the Boiler you will find the following wiring looms for connection,

  1. Black 3 Core cable – for a  permanent live connection
  2. Orange Volt free – Heat request
  3. White Cable – connect directly to your systems circulating pump

The controller is pre-wired. Ideally you will have a 5 core cable running to the boiler,


Permanent Live – 5 Core Wiring Set-Up (Recommended)

Black Cable – connect 3 cores to the permanent live supply from a 5amp fuse spur

Orange Volt Free Cable –  Join Orange Aux cables from mini valves, and Grey Aux cables form mini valves, and run 2 core back to the orange volt free cables

White Cable –  connect directly to your systems circulating pump

5 Core Wiring Diagram


Permanant Live – 4 Core Wiring Set-Up

Black Cable – connect 3 cores to the permanent live supply from a 5amp fuse spur

Orange Volt Free Cable – use the 4th core as a switch live from your timeclock, connecting to the Volt free orange cables at the boiler using either a relay or minivalve to step this down to low voltage

White Cable –  connect directly to your systems circulating pump

4 Core Wiring Diagram


Switch Live – 3 Core Wiring Set-Up (Note this set up will disable frost protection)

Black Cable – connect switch live to this cable

Orange Volt Free Cable –  Bridge out these heat call cables, leaving a permanent heat call once switch live is contacted

White Cable –  connect directly to your systems circulating pump

3 Core Wiring Diagram


Combi Controller Wiring Set-Up

Black Cable – connect switch live to this cable

Orange Volt Free Cable –  to the back of the combi controller

Red Volt Free Cable on Combi Controller – These now act in the same way as the heat call cables in the 5 core example above.

White Cable –  connect directly to your systems circulating pump

Combi Wiring Diagram


For further information or line diagrams, simply call us on 042 969 2032

Prime the boiler with kerosene and press the power button on, ensuring there is a heat request from your time clock. The boiler then takes 3 attempts to go into ignition phase.

  1. The fan will start up and purge the air through the heat exchanger
    • Troubleshooting if sequence missed
      • No heat request, or incorrect wiring, please refer to “Wiring the Boiler”
      • Photocell disconnect, clean and reconnect
  2. The electrodes spark
    • Troubleshooting if sequence missed
      • Photocell disconnect, clean and reconnect
  3. The oil pump will engage to pump oil to the burner
    • Troubleshooting if sequence missed
      • Not fully primed with oil bowl filled and oil line clear of air
      • This will be apparent by the pump making a loud noise
  4. Successful ignition can be seen through the sight glass

All boilers come pretested from the factory, so minimal adjustments are needed on commissioning. Using a flue gas analyser, you are looking for the following read outs,

  • 11.5% Co2
  • 50-60 PPM

Simply adjust the damper opening on the burner to achieve these numbers.

The Saturn Oil Boiler range includes a 100% stainless steel heat exchanger whereas most condensing oil boilers on the market today use a combination of mild steel and stainless steel to produce their heat exchangers. All condensing boilers produce a condensate or vapour that is highly corrosive and so not generally suited to mild steel. The Saturn NHC uses an all stainless steel high-efficiency heat exchanger that is designed to handle the corrosive condensate. The NHC is also the only boiler to include a neutralising filter and trap to treat the corrosive condensate.

A oil booster pump comes as standard, fitted and operational on all our boilers, meaning there is no longer a need for a tigerloop or equivalent on installations where the oil supply is below the burner. This booster pump works up to a 2 meter differential. This booster pump is positioned just after the oil line connection and before the electric oil pump for the burner itself.

Our unique selling points below set us apart from our competitors

  • Highly Efficient A Rated
  • 100% Stainless Steel Heat Exchanger
  • Saturn Smart Controller
  • Digital Fault Diagnostics
  • Digital Temperature Reading
  • Weather Compensation Mode Available
  • Long Life Quality Components

You can get a Saturn Oil Boiler in your local merchant. Click to check our interactive Merchants Map and locate your nearest merchant. Alternatively, tell your plumber you want a Saturn Oil Boiler installed and they can source the boiler from their merchant.

There are currently no grants available for oil boilers on their own, but if the boiler is installed with a heating control upgrade, there is a grant available that can take the overall price down.

The Saturn Oil Boiler is ERP, HARP & SEDBUK A rated and is a high efficiency condensing oil boiler.

The boiler should be serviced every year in accordance with terms of your warranty. Contact your installing technician, or ourselves here at Saturn Heating where we can point you in the direction of a suitably qualified Saturn certified service engineer.

We use Stainless Steel in order to ensure your boiler stands the test of time. Although condensing boilers have increased the efficiency of oil boilers tremendously, the bi-product is an extremely corrosive condensate. This condensate is known to rot and eat away at lesser grades of steel. Due to our used of stainless steel, you can run our boiler right down as low as 20 degrees, making our boiler ideal for underfloor heating, and efficient weather compensation modes without the need to change your original plumping.

Yes. It is an oil condensing boiler and significantly reduces energy consumption in comparison to conventional boilers.

You can source spare parts with your local merchant that supplies the Saturn range. If they do not have a specific part at that particular time, we have a nationwide next day delivery service headquarters in Carrickmacross, Co. Monaghan.

  • 5 year warranty on the stainless steel heat exchanger
  • 2 year warranty on the burner and other parts

The upgrade of a boiler is counted in the HRI scheme, be sure to choose a HRI registered Saturn technician if you intend to avail of this VAT credit scheme.

Please check “Wiring the Boiler” above in this section to ensure the boiler has been correctly wired. If when you have a heat requests from the house all you see is a reading on the controller which is close to the outside temperature (0 to 25 degrees) – 2 main culprits with above are –

  1. If wired with a permanent live connection
    1. This wiring method demands that you connect the orange heat call cables to the auxiliaries from the MV’s on the heating system, when the MV opens, these volt free contacts close, which in turn calls for the boiler to come on.
  2. If wired with a Switch live has been run to the boiler to control the heat call (note this disables your frost protection)
    • This wiring method demands that you permanently close the orange contacts. Once you do this, and a heat call will turn you boiler on.

For more information, feel free to call the office and we can walk you through it.

First of all, please refer to the wiring portion on the FAQ’s above. The controller is pre-wired, meaning once you bring a permanent live directly to the black flex you simply connect the white flex from the controller to the circulating pump.

  • Please ensure you use only the live and neutral from this flex to power your circulating pump.
  • Shared neutrals from a permanent supply to power a circulating pump will cause it to continuously run.

Once this re-wiring has been complete per the section on wiring above, you will find you boiler should run as expected. Remember, your pre-wired controller will only call your circulating pump once your boiler is within 10 degrees of your set point on the dial. Hence this is an easy mistake to diagnose and rectify.

This is to let you know there is an issue somewhere with your boiler, there will be a code showing where your temperature is usually shown. Below are the codes which indicate the specific issue.

Error Code Cause
02 – Low water level
03 – Misfire
04 – Flame failure
05 – Temp. sensor disconnected
06 – Short circuit of Temp. sensor
12 – Misfire in combustion
16 – High limit thermostat

Contact our Technical Team or your plumber for more information.

The on – off button on the controller is your simple reset. Once the boiler is reset, it will engage the burn sequence.

  1. Fan Purge – (5 to 20 seconds)
  2. Electrode activation
  3. Oil pump activation
  4. Ignition

The electrodes will make 3 separate attempts to ignite the kerosene. If this fails on the 3rd attempt a fault code will be generated.

If the oil tank has run dry – Bleeding the oil line

Quite often, a failure will be the result of the oil running dry. Simply unscrew the Philips head on top of the filter bowl and reset the boiler, the filter bowl should fill before the burners 3rd attempt to ignite and burn sequence should have successfully initiated.

If for some unknown reason, the above method has not fully bled the fuel line, you will see an additional bleeding point on the back left of the oil pump, open this valve and again the filter bowl should fill before the burners 3rd attempt to ignite and burn sequence should have successfully initiated.

If neither of these work, you may have an issue with your booster pump.

Other possible issues leading to poor ignition

Ensure the correct Danfoss Oil Nozzle type is used –

  • 25 Model = 0.60 / 60°EH
  • 30 Model = 0.75 / 60°ES
  • 40 Model = 1.00 / 80°ES

Ensure the correct fuel type is used

We suggest setting your boiler at 70-80°C  for a typical house using radiators with a hot water cylinder fed from the boiler. Your plumber and service technician will adjust the set point of your boiler appropriately upon installation/service and we suggest the temperature should not be changed without first consulting your Saturn Specialist. NB* Your system may be set up for weather compensation, which works off a heat curve, meaning the Saturn Smart Controller intelligently adapts to the heat needed throughout the year. Therefore contact your Saturn Specialist for more advice.

There is a controller needed that does not come as standard with our boilers if you want to make it a combi. Please note, this controller is simply a combi controller, it is not a time clock and it is not a room stat. Please proceed with time clocks and stats as you would on a normal Saturn install with the below addition.

Wiring the Combi Controller

Boiler will continue be wired in the same way as instructed in the “Wiring the Boiler” section, there will be 1 change needed. This controller needs to be placed in an easily accessible position within the house, in order to turn the hot water function on and off.

There are 2 sets of cables on the back of the controller

  • Orange – runs directly back to the orange heat call in the boiler
  • Red – these now act as the heat call cables which need to be connected to your MV auxiliaries.

Using the Combi Function

Providing the boiler is already running, there will be a significant store of hot water in the boiler for DHW use.

For prolonged DHW needs, and for DHW needs during times when the boiler is not necessarily running (summer months/hours of non boiler use)

  • Press the “Taps” button on the Combi Controller
  • Hot water is not instantaneous if the boiler has not been running but should be usable withing 2 minutes
  • To end DHW mode, press the “Rads” button on the Combi Controller

Pressing the “Taps” button essential isolates the heat within the heat exchanger by stopping the circulating pump from circulating to the heating circuits.  Pressing the “Rads” simply re-engages the circulating pump to the heating circuits.

Simply plumb either a mains supply (providing you have adequate water pressure) or a connection from a header tank to the 1/2 inch BSP tapping at the back of the boiler, with the hot water distributed from the pairing 1/2 inch BSP tapping.

Per manufacture guidelines, an expansion vessel is not needed on this DHW circuit, but if an installer wishes to do so, it should be on the cold water feed down stream from any NRV’s in place.

Providing the boiler is already running, there will be a significant store of hot water in the boiler for DHW use.

For prolonged DHW needs, and for DHW needs during times when the boiler is not necessarily running (summer months/hours of non boiler use)

  • Press the “Taps” button on the Combi Controller
  • Hot water is not instantaneous if the boiler has not been running but should be usable withing 2 minutes
  • To end DHW mode, press the “Rads” button on the Combi Controller

Pressing the “Taps” button essential isolates the heat within the heat exchanger by stopping the circulating pump from circulating to the heating circuits.  Pressing the “Rads” simply re-engages the circulating pump to the heating circuits.

We have 2 models, an external cabin pack model, and a boiler house model. Both of which are open flued appliances. The boiler house model is taller than most counter tops, and needs top access for servicing and maintenance reasons. Providing the correct ventilation regulations are followed, and the top access is not hampered, this model is OK to install in a kitchen and utility room per regulations,  but is better placed in a boiler house environment due to the above reasons. The noise levels are measured at 66 to 69 dB which will be heard within the house.

As the supplier of Saturn Oil Boilers here in Ireland, we deal directly with merchants. You will have to contact your local merchant to get a final price on our boiler.

The entire Saturn Oil Boiler range runs on kerosene.

Saturn Oil boilers have been in Ireland since 2010, with installations nationwide and a successful installation network of Saturn technicians trained to install our boiler at the highest quality.