Holwood Farm, Saltash Devon

Project Included

  • Lindner & Sommerauer 65kW wood chip system
  • Flue system
  • Thermal stores

Fuel Consumption

32 tonnes of wood chips per annum. (Based on 100kW boiler, in a similar application)

Fuel Cost Saving

Wood Chips; 50-80%. (Source; Biomass Energy Centre)

CO2 Saving

Up to 96% or 28 tonnes vs heating oil. (Source; Biomass Energy Centre)

RHI Payments

A project of this size would gain approximately £7,500 every year for 20 years, index linked to inflation.

Total Project Price


Payback Period

4-5 years (Combining RHI income & fuel cost saving).

(*Financial information not specific to this project – figures are based on an average of several typical projects of this size. Current information on RHI payments for guidance only, not to be considered a guarantee).

Project Summary

Rainbow Heat and Power’s complete installation, commissioning and maintenance service included;

  • Lindner & Sommerauer 65kW wood chip system.
  • 4m agitator.
  • 5,000 litre thermal Store.
  • Installation of stainless steel flue, accessories and connections.
  • Automatic de-ashing.
  • Installation into the purpose built boiler house.
  • An RHI approved heat meter which records heat use in kWh (on which RHI payments are based) complete with certification.
  • Assistance with RHI application including schematic drawings.
  • Commissioning, programming and end user training.


Holwood Farm is a working pig farm situated in Saltash, Cornwall.

The Requirement

Rainbow Heat and Power were briefed to design, supply, install, commission and maintain a highly efficient and fully automated system.

The system would run on locally sourced wood chips and supply the farms two Pig Farrow Houses with heating.

Complete Biomass Heating Package

Rainbow Heat and Power designed, supplied, installed and commissioned a Lindner & Sommerauer 65kW Chip System with a 5000ltr Thermal Store.

The fuel store was built between one of the pig houses and an existing barn along with the boiler room to Rainbow Heat and Powers specifications. 

Financial Benefit

As well as delivering fuel cost savings of 50-80% the installation will be accredited to the Renewable Heat Incentive (RHI), receiving payments for the next 20 years.

Technical Specifications

SL Series Biomass Boiler System



Maximum Heat Output kW 65
Minimum Heat Output kW 12.4
Min. Combustion Efficiency % 93.1
Max. Combustion Efficiency % 93.5
Width mm 770
Depth mm 1,050
Height mm 1,530
Flow & Return Diameter


Flue Connection Diameter mm 200
Flue Connection Height mm 650
Boiler Weight (Assembled) kg 740
Auger Weight kg 82
Water Content Ltr 116
Power Consumption A/ V 16/ 400