Gumma Poultry Farm

Key Facts

Project Included

  • Lindner & Sommerauer 199kW biomass boiler system.
  • A flue system, thermal store, distribution pipework including internal connections to heat exchangers were also included.

Fuel Consumption

  • 87 tonnes of wood chips, per annum. (Based on system of similar capacity, in a similar application)

Fuel Cost Saving

  • Wood chips; 20% versus poultry LPG costs. (Source; Biomass Energy Centre)

CO2 Saving

  • Up to 96% vs LPG (Source; Biomass Energy Centre)

RHI Payments

  • A project of this size would gain approximately £22,400 in RHI payments every year for 20 years, index linked to inflation.

Total Project Price

  • £120,000

Payback Period

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

Project Summary

  • 1 x 199kW Lindner & Sommerauer biomass boiler.
  • Runs on wood chips.
  • 4m agitator and 4.7m auger to enable a large fuel store to minimise fills.
  • 5,000 litre buffer tank.
  • 6 new fan radiators in the poultry sheds (3 per shed) and hot water system.
  • 3 class 2 RHI eligible ultrasonic heat meters complete with certification.
  • Heat exchanger fitted into farm house.
  • Biomass boiler linked to existing heating and hot water system in the farm house.
  • High efficiency, low energy main system pump.
  • Full assistance with RHI application including schematic drawings.
  • Commissioning, programming and end user training.


Gumma Farm is a free range poultry farm in Presteigne on the Welsh borders with 2 broiler sheds, growing 132,000 birds per year.

Bird welfare is a paramount on the farm. Management of the poultry houses’ environment a big part of this. The farm's owners had been experiencing high costs of using open LPG heating which were an expensive and inefficient heat source. They were detrimental to the poultry house environment and led to increased humidity, CO2 and ammonia levels.

As a result, a large amount of ventilation was needed, leading to more heating expense to maintain temperature. This, combined with regular top-ups of bedding was costing the farm a lot of money.

The Requirement

The driver for the customer was the reduction of the farm’s LPG fuel bill and to generate Renewable Heat Incentive payments. A further driver was to supply  a better growing environment for the birds by producing drier heat than the existing LPG heaters.

They also hoped to alleviate the need to spend money on electricity to run the large ventilation units that are required to remove the products of combustion that are typically pumped in poultry sheds heated by open LPG heaters.

The fuel cost savings and RHI payments will be reinvested back into Gumma Farm in order to support the farm’s long term growth plans.

Complete Biomass Boiler District Heating package

We installed the boiler, fuel delivery system and buffer tank in the plantroom as well as the heat main to connect the poultry sheds and farm house. The system replaced internal LPG heater units in the poultry sheds but also the farmhouse’s LPG boiler. We also installed a new hot water and radiator system inside the 2 poultry sheds and carried out the connections into the farm house.

The Renewable Heat Incentive

The installation will soon be accredited into the Renewable Heat Incentive and start receiving payments. The RHI Payments and fuel cost savings will make the project both financially and environmentally sustainable.

Technical Data

SL 199/250 Biomass Boiler System SL 199
Maximum Heat Output kW 199
Minimum Heat Output kW 70
Combustion Efficiency %

91.1 Min/ 95.3 Max

Width mm 1,175
Height mm 1,800
Depth mm 2,650
Flow & Return Diameter " 73
Flue Connection Diameter mm 250
Flue Connection Height mm 1,370
Boiler Weight (Assembled) kg 2,100
Auger Weight kg 250
Water Content Ltr 390
Power Supply A/V 16/ 400