Hay House Nursing Home

Key Facts;

Project Included

  • 150kW Lindner & Sommerauer biomass boiler.
  • Runs on wood pellets.
  • Distribution pipework including all internal connections to existing heating systems.

Fuel Consumption

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

Fuel Cost Saving

  • Wood pellets; 20-40% versus heating oil. (Source; Biomass Energy Centre)

CO2 Saving

  • Up to 96% or 66 tonnes vs Oil. (Source; Biomass Energy Centre)

RHI Payments

  • A project of this size would gain approximately £17,000 in RHI payments every year for 20 years, index linked to inflation.

Total Project Price

  • £105,000

Payback Period

  • 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.

Project Summary;

  • 150kW Lindner & Sommerauer biomass boiler.
  • Runs on wood pellets.
  • Fully automated wood pellet fuel delivery system.
  • 2 x 2,000 litre buffer tanks.
  • 18m of underground heat main.
  • RHI eligible ultrasonic heat meters complete with certification.
  • 150kW Consumer Interface Unit fitted into main building.
  • Biomass boiler linked to existing heating and hot water system in the farm house.
  • Automatic ash extraction system.
  • High efficiency, low energy main system pump.
  • Full assistance with RHI application including schematic drawings.
  • Bespoke boiler house construction.
  • Commissioning, programming and end user training.


Hay House is a family-owned and run nursing home specialising in the care of people with dementia and other mental health conditions.

Resident comfort is a priority for the owners, who were experiencing large heating bills from the three old and inefficient oil boilers they were using to heat this Grade II listed building.

The Requirement

We won a competitive tender for the supply and installation of a 150kW Linder & Sommerauer biomass boiler which will run on EN Plus grade wood pellets.

Two 2,000 litre buffer stores, all associated fitting accessories and a wood pellet fuel suction system were also included. As part of the project, Rainbow also managed Hay House’s RHI application.

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 main house.

Financial Benefit

A 150kW project of this size would expect to receive Renewable Heat Incentive (RHI) Payments of approximately £17,000 per annum and to gain a fuel cost saving versus oil of 20-40% or approximately £3,500 per annum.

The fuel cost savings and RHI payments combined will deliver a payback on the capital cost of the equipment in 5 years.

Boiler Specifications

  • Max. Heat Output; 150kW
  • Min.Heat Output; 41.9kW
  • Max. Combustion Efficiency; 93.8%
  • Min. Combustion Efficiency; 91.8%
  • Width; 1,050mm
  • Depth; 1,465mm
  • Height; 1,810mm
  • Flow & Return Dia.; 40mm
  • Flue Connection Dia.; 250mm
  • Flue Connection Height; 650mm
  • Boiler Weight (Assembled); 1,405kg
  • Auger Weight; 85kg
  • Water Content; 340Litres
  • Power Consumption; 16amp, 400 V