Fixington

Service an oil boiler

Trade: Heating Engineer

⭐ Introduction

If you have an oil-fired boiler heating your home, regular servicing is essential to keep it running safely and efficiently. Servicing an oil boiler involves a thorough check, cleaning, and adjustment of the appliance to ensure it heats your home reliably throughout the colder months.

You should arrange for an oil boiler service at least once a year, ideally before the winter heating season begins. A well-serviced boiler runs more efficiently, reduces the risk of breakdowns, helps to avoid costly repairs, and ensures compliance with UK safety guidance.

Servicing is especially important because oil boilers burn fuel that produces soot and residue, which can build up inside the burner and flue, potentially creating dangerous carbon monoxide leaks if left unchecked.

🔧 What the job involves

A professional heating engineer will carry out a detailed service that usually includes:

  • Inspecting the boiler to check for visible signs of wear, damage, or leaks.
  • Cleaning the burner and combustion chamber to remove soot and deposits.
  • Checking and adjusting the oil nozzle to ensure fuel is burning efficiently.
  • Testing the flue and chimney for blockages or carbon monoxide leaks.
  • Measuring the flue gas emissions with specialist equipment to verify safe operation.
  • Inspecting and replacing filters if necessary.
  • Checking the controls and safety devices to ensure they work correctly.
  • Bleeding radiators if needed to improve system performance.
  • Recording details in a service report, which may also include recommendations.

Note that oil boilers don’t fall under Gas Safe regulations (which cover gas appliances). Instead, engineers servicing oil boilers should be qualified and experienced in oil heating systems and work to relevant British Standards.

📝 Step-by-step from booking to completion

  1. Enquiry: Contact a reputable heating engineer or firm that specialises in oil boilers. You may book via phone, email, or through an online form.
  2. Survey and quote: The engineer might offer to visit to assess your boiler’s condition and provide a fixed price or estimate for the service.
  3. Appointment: Arrange a convenient date for the engineer to come and carry out the service, ideally before the heating season.
  4. Preparation: Clear the area around your boiler and ensure access to your oil tank if needed. Make a note of any issues you've noticed.
  5. Day of the service: The engineer will complete the full service, clean parts as needed, carry out safety checks, and test the boiler.
  6. Report and advice: You will receive a written report detailing the work done, any faults found, and recommendations.
  7. Payment: Settle the agreed amount. Some companies may offer certificates or service contracts.
  8. Aftercare: Keep the report and any paperwork safe for future reference or insurance purposes.

💷 Main costs to expect

  • Labour: Typically the largest part, covering the engineer’s time (usually 1–2 hours).
  • Materials and parts: These may include replacement filters, seals, or oil nozzles.
  • Disposal: Safe removal and disposal of any waste materials or old parts.
  • Certification: Some companies provide a service certificate or report, which might be included in the price.
  • Additional repairs: If problems are identified during the service, you may be quoted separately for repair work.

Example breakdown (approximate):

  • Labour: £80 – £120
  • Parts (filter/nozzle): £10 – £40
  • Waste disposal: £5 – £15
  • Service certificate/report: Usually included

📊 What affects the price

  • Boiler model and age – older or rare types may require more time or specialist parts.
  • Accessibility – cramped or difficult-to-reach boilers add time and complexity.
  • Condition – a boiler needing more cleaning or repairs will cost more.
  • Location – services in remote or high-demand areas might be priced higher.
  • Certification requirements – some properties or insurers may insist on official documentation.
  • Any remedial work found during the service (e.g., leaking pipes).
  • Urgency or timing (out-of-hours visits are more expensive).
  • Type of oil burner system (single or two-stage burners may require more attention).

⏱ How long does it take?

A typical oil boiler service usually takes between 1 and 2 hours.

  • Simple servicing of a straightforward system: around 1 hour.
  • Older or more complex boiler models or where extra cleaning is needed: up to 2 hours.
  • If additional repairs or parts replacement are required, this can add more time or need a return visit.

🏠 Can you DIY it?

Servicing an oil boiler is not recommended as a DIY job. It requires:

  • Specialist knowledge of oil heating systems.
  • Use of testing equipment like flue gas analysers to measure emissions.
  • Safe handling of fuel and soot residues.
  • Understanding of safety checks to prevent carbon monoxide hazards.
  • Compliance with UK safety guidance.

Incorrect servicing can lead to inefficient burning, damages, or unsafe conditions. It’s best to hire a qualified heating engineer with relevant expertise.

💰 Typical UK price range

You can expect to pay roughly £90 to £160 + VAT for a standard oil boiler service. The exact price will depend on your location, boiler make, and condition, as well as any additional work needed.

This estimate includes labour, a basic filter replacement, cleaning, and testing but excludes major repairs or replacements.

✅ Handy tips before you start

  • Book early: Arrange your annual service well before winter to avoid busy periods and breakdowns.
  • Keep your paperwork: Maintain a folder with all service reports, invoices, and warranties.
  • Prepare the area: Ensure clear access to the boiler and oil tank.
  • Check your oil supply: Make sure you have sufficient oil for the engineer to safely test the burner.
  • Ask for certification: If your house is rented or insured, it may require official service documentation.
  • Consider a service contract: Some firms offer annual plans with priority visits and discounted repairs.
  • Regular checks: Besides servicing, monitor your boiler for unusual noises, smells, or smells that could signal problems.

A well-serviced oil boiler keeps your home warm, reduces fuel costs, and provides peace of mind that your heating system is safe and reliable.