Biomass Repairs & Servicing

Open door of a Hack 200 showing ash build-up
This grubby Hack 200 has worked hard all year on a broiler farm and is now getting the TLC that will keep it in good working order for the year ahead

ETA, Gilles and Klover biomass boiler servicing and maintenance

Having your biomass boiler professionally serviced annually is a condition of your RHI agreement. Servicing improves the boiler’s efficiency, resulting in lower fuel bills and increased reliability. Biomass boilers are a completely different piece of equipment to traditional fossil fuel boilers and need specialist engineers to properly maintain the biomass system. Our dedicated engineers are ETA trained and Gilles trained on wood chip, pellet and log systems. Commercial Biomass Ltd can also supply you with ETA boiler spare parts, as well as Gilles boiler spare parts if you prefer to make your own repairs.

ETA and Gilles Boiler Servicing Detail:

During a service, our engineers will as standard:

  • Check the boiler’s fault log and repair faults (providing no additional parts required other than van stock)
  • Inspect all boiler access doors and seals, check and replace if damaged
  • Thoroughly examine and clean heat exchanger
  • Check combustion chamber, including all refractory blocks, tilting grates or walking floor grates, stoker and ash augers
  • Test and clean fuel store and boiler augers
  • Clear primary and secondary air ports of carbon build up
  • Inspect and clean boiler draught fan system
  • Inspect all mechanical seals
  • Inspect and test ignition device
  • Check and lubricate all motors, chains and bearings with the correct lubricant for the heat zone the part is in
  • Check control panel hardware and PCB electrical connections
  • Check anti-burnback and all other safety systems are fully operational
  • Test, run and check operation of all boiler systems

Additionally during a service, our engineers (unlike most of our competitors) will:

  • Remove and clean your turbulators
  • Thoroughly inspect and sweep the boiler flue
  • Perform a flue gas analysis to check combustion efficiency
  • Check the system water for PH and inhibitor levels

Upon completion a service report will be issued providing detail of the work carried out, engineer comments and advisories for any remedial work.


Typical Servicing Charges (including mileage)

10-30 KW – £300
35-60 KW – £350
80-201 KW – From £350 (time varies with fuel quality and run hours)
350-500 KW – From £500 (time varies with fuel quality and run hours)

Any faults found on the boiler during servicing will be rectified during the course of the visit if possible with parts our engineers carry on board the service vehicle. These will be charged at a lower rate while on site than if we had to return.

We also offer service contracts to suit your requirements, these generally involve 1-2 visits per year, depending upon your wishes and the number of hours you typically run the boiler for.

All prices plus VAT.

ETA and Gilles Boiler Breakdowns and Repairs

In addition to servicing, our team of engineers are on call to diagnose and repair ETA Boiler breakdowns.

Typical Call Out Charges

Standard – 8am – 5pm next day or subsequent day £40 per hour plus mileage, no call out fee.

Emergency = £100 same day call out charge per engineer then £40 per hour plus mileage @ 50p/mile.

Emergency out of office hours – 5pm – 8am = £200 call out charge per engineer then £45 per hour plus mileage @ 50p/mile.

Weekends and Bank Holidays = £300 call out charge per engineer then £50 per hour plus mileage.

If additional parts are required and a return visit is needed then only the hourly rate is charged (including travel time) on the return visit + mileage at 50p per mile. If the repair can wait until the next working week day there is no call out charge.

All prices plus VAT.

ETA Spare Parts

Commercial Biomass Ltd also offer spare parts for all ETA boilers, please contact us for a quotation.

Gilles Spare Parts

Commercial Biomass Ltd also offer spare parts for all Gilles boilers, please contact us for a quotation.

Are we in your area?

We cover the whole of the south west of England: Cornwall, Devon, Dorset, Somerset, Wiltshire and Hampshire, plus Gloucestershire, Gwent, Monmouthshire and Herefordshire.


Commercial Biomass Repairs & Servicing on our installations

ETA boilers come with a one year parts and labour guarantee, plus a four year parts guarantee. This covers all parts of the boiler except the combustion chamber and agitator arms, giving you five years’ peace of mind included within the cost of the boiler.

Our team of highly trained maintenance engineers provide annual servicing and backup if you should experience a breakdown. Several levels of service are available, from a fixed annual fee to an ‘as and when you need us’ service on an hourly rate.

Commercial Biomass Repairs & Servicing on other installations

Has your installer ceased trading? Are you unhappy with the service your existing servicing company is giving you? As one of the most experienced biomass installers in the UK, we are happy to provide our expertise for commercial and domestic customers in the south and south west, regardless of which supplier installed your equipment. We will also pick up your ETA or Gilles manufacturer’s warranty where your original installer left off.

System extensions, revisions and additions

We can undertake any system extensions and remedial repairs you need, and we will deal with the Ofgem notifications necessary within 28 days of a major change to your accredited system.

Please contact us to find out more.