Biomass Boilers

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What is Biomass?

Biomass is biological material derived from living, or recently living organisms. It most often refers to plants or plant-based materials which are specifically called lignocellulosic biomass. Wood remains the largest biomass energy source to date.

Wood based Biomass comes in various forms. The two main types are woodchip and pellets. Harp Renewables Biomass energy systems can be supplied to use either woodchips or pellets. This provides Harp Renewables with the flexibility to present their clients with the best biomass system for their site.

To date, we have used the Twin Heat Biomass Boiler in the majority of our site projects. Although there are various Biomass Boiler providers available, we find that the Twin range provides us with the best solutions with its robust and reliable nature.

What to expect

Harp Renewables Biomass energy solutions are available:

  • Fully containerised or bespoke build.
  • Revolutionary Harp biomass technology
  • Fuel storage included.

However, where outside space is not readily available, Harp specialists can work on a custom build Biomass system that can be incorporated into existing plant rooms. An onsite survey is required before any custom-made biomass can be provided.

Biomass applications may attract RHI (Renewable Heat Incentive) which are available in Northern Ireland, UK, Scotland & Wales. Further details may be found here: Non-domestic Renewable Heat Incentive (RHI) . A list of certified woodchip and pellet suppliers can be found on the UK Government website.

Biomass benefits for your business


  •  Attracts Renewable Heat Incentive (RHI) payments.
  •  Less expensive than fossil fuels such as oil or LPG.
  •  Achieve green status credentials for your business
  • Creates jobs with local suppliers
  •  Benefits through the carbon trust offsets CO2 emissions
  • Good commercial paybacks are realistic and achievable
  • To find out more about Biomass and how it can help your business, contact us today.

Harp Biomass Solutions

1) Harp Biomass containerised system.

Our favoured solution is the Biomass containerised solution. Whether its fuelled by traditional Biomass only or Biomass derived from material available at your site we have a range of Harp bio-digesters with revolutionary technology suitable to convert your existing material (such as food waste) into a biomass fuel to supplement traditional materials.

A Harp bio-digester, fuel handling, and boiler combination is quick and easier to install as a modular system.

Turnkey solution includes:

  • A suitably sized bio-digester to process organic materials
  • Relevant auger/conveyor systems suitable to support the integrated system
  • Biomass fuel storage facilities
  • Biomass boiler
  • Associated mechanical components
  • Heat storage, heat exchangers, and buffers as required to integrate with your existing systems
  • Woodchip based. 
  • Food waste processing facilities. 
  • Turnkey solution for fuel supply, heat creation, and distribution. 
  • This system was delivered in modular form as ‘Plug and play’.

Harp Biomass Solutions

2) Harp Bespoke Biomass Systems.

Harp Renewables understands the importance of flexibility and caters for each client’s specific needs. The Harp bespoke design process considers;

  • Planning
  •  Surrounding area
  •  Local needs
  • Space

The expert team at Harp Renewables then specifically designs a bespoke Biomass enclosure to meet those area-sensitive needs.

CS Industrial Biomass Boilers – TwinHeat.

The TwinHeat CS INDUSTRIAL range provides an effective solution for commercial heating. Three models provide an output range of 90 – 200kW, which are fed by an external storage silo such as the TwinHeat Quattro or Walking Floor. TwinHeat boilers automatically burn Wood Pellets, Wood Chip & Cereal Grain.

The Biomass Boiler is fitted with an additional draft fan as standard and can be equipped with automatic de-ashing, automatic cleaning of heat exchanger, and a telephone modem that sends a text message in case of a fault alarm.

What’s required?

This system requires a 3 phase 400 volt – 32 amps electrical supply. All the TwinHeat range has been tested and granted approval by the Danish Technological Institute in accordance with DS/EN305-5.

Get in touch


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See what our clients say


“We haven’t sent any waste offsite since we installed the bio-digester in December, The bio-digester makes people think a bit more about what they are doing and keeps everyone focused on ‘green’ ways to process waste. The process has been embraced by our tenants and has got them thinking more about waste segregation. They now unpackage their sent produce.

As a result, not only are there no contaminated bins coming through, but we are creating added revenue by bailing our plastic. In preparation for a return to normal operations, we look forward to installing a second Harp – bio digester.

We are delighted with this initiative which directly feeds into our People Planet Sustainable Strategy”

– Michael Farrell, Estate Manager at Captial Dock Aramark Properties.

''Ideal Solution''

“Our customers are delighted that they now have a solution for food waste and are not contributing to unnecessary environmental damage caused by sending the organic matter to landfill. Harp Renewables has been hugely helpful and very responsive to any questions we have had, particularly in the early days while everyone was getting used to using the bio-digester.

There has also been a lot of interest in the bio-digester from other Local Authorities and the DCCAE.

It would be an ideal solution to any organisation with excess food waste and I would have no hesitation in recommending Harp Renewables to any interested party.”

 – Bernadine Carry, Environmental Awareness Officer at Meath County Council shares

''Great Educational Tool''

“We invested in a Harp CX5 Bio-Digester with a bespoke integrated biomass boiler as a solution to our waste costs. We are saving around £11,000 annually now.

With this solution we are also able to use the biomass boiler to heat out facilities which in turn dramatically reduces our heating’s C02 emissioons. All the excess digestate is then used as an organic fertilizer in our on-site greenhouses.

This is a great educational tool to teach all the students about sustainability so thatin the future, students are interested and determined to make this world a greener more environmentally friendly place to live.”

– Penair School

Harp Renewables