Oil Boiler Service


Having a liquid fuel-fired appliance serviced regularly helps to keep it operating efficiently. This reduces fuel bills and saves money on costly call out fees for unexpected breakdowns and can keep the boiler guarantee valid.

It is recommended that appliances and equipment are serviced at least once a year or as recommended by the manufacturer.

Without regular servicing, the efficiency and reliability of a liquid fuel-fired appliance will be affected for many reasons including:

  • Excessive smoke and partially burnt fuel deposits can cause soot to form within the appliance heat exchanger. This restricts the amount of heat that can be transferred into the heating system water. The cleaner the heat exchanger, the more efficient the appliance will be!

  • Fuel nozzles regulate how much fuel passes through the burner. The nozzles are consumable items that wear over time, affecting combustion and lowering boiler efficiency. If they are not replaced this may cause "sooting up" of the heat exchanger due to too much fuel passing through the burner.

  • Fuel pumps contaminated with debris and/or water can cause premature failure.

  • Photocells can glaze over with deposits. Photocells are an important safety feature which detect whether the appliance has lit. If a photocell is dirty it may not be able to detect the burner flame correctly and could cause the appliance to shut down randomly. Appliances frequently switching on and off will be less efficient than those running for longer periods.

  • Electrodes can wear and attract soot and deposits. Electrodes produce a spark to light the fuel, if they are worn or in poor condition the appliance may not light. Again, this causes inconvenience, inefficiency and increases fuel cost.


What To Expect From Us

Depending on type of boiler and its condition, we ask that you allow around 3 hours for the service to be completed.

The boiler will be disassembled into key parts, cleaned and inspected. Any parts requiring replacement can easily be done at this stage and will be recorded on the service report.

Items commonly replaced during a service would be the oil nozzle, o-rings, gaskets or rope seals, flexible oil hoses and oil tank filters.


During the service we will complete and issue you with an OFTEC CD/11 Service Report detailing everything that has been checked and list the parts replaced. Any observations will also be listed on this form along with the results from the flue gas analyser.

You will also get a completed TI/133D Domestic oil storage tank spillage and fire risk assessment form looking at environmental and fire hazards specific to your oil tank.






Fuel storage tank and supply

Failures such as boiler lockout, intermittent running and fuel pump seizure can be a direct result of poor maintenance of the fuel supply system, that is why it is also checked during the service.

The primary reasons for such failures are:

  • Water in the fuel storage tank from condensation and/or water ingress.

  • Bacterial growth/sludge build up within the tank blocking the filter.

  • Leaking joints, rusting components and system debris.

The condition of the fuel storage tank, fuel supply pipework and all fuel supply components (filter, deaerators, etc.) are visually inspected and observations reported during the boiler service so action can be taken to replace or repair equipment as required. The fuel inside the tank is also dip tested to determine if any water contamination is present.