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Wood Pellet Condensing Boilers (Biomass)

Wood Pellet Condensing Boilers (Biomass)

Wood pellet boilers are an environmentally friendly, safe and convenient way of heating the home, using wood pellets as fuel.

Grant Approved InstallerHowever, they differ from traditional solid fuel boilers. Apart from the green aspect, the units are fully automatic and behave more like an oil or gas boiler, using advanced controls which cleverly regulate the amount of fuel being delivered to the burner to match the heat demand on the boiler. The fuel is fed to the burner via an auger connected to the adjacent pellet store/hopper. This can, in turn, be automatically supplied from a bulk pellet store which can vary in size.

The process of burning wood produces ash, so wood pellet boilers, biomass boilers normally require a certain amount of regular cleaning and maintenance, which can be tedious. Grant has, however, found a better solution with their unique ‘self cleaning’ boiler design, reducing the need for cleaning to once a year under normal running conditions.

The Grant Approach

In this eco-aware climate, Grant feel it is imperative to provide both householders and installers with innovative green options for home heating.

The brief behind the Grant Spira Wood Pellet Boiler range was to ensure installation is straightforward, daily operation easy and maintenance as effortless as possible, whilst guaranteeing the same high quality and efficiency everyone expects from Grant products.

Unique and efficient

The Spira utilises Grant’s award winning patented stainless steel turbulator baffle system. The units are available in outputs of 6-26kW, 9-36kW, 12-52kW, 15-62kW and 18-72kW with efficiencies up to 97.4%. They come complete with a pellet store/hopper and feed auger, which automatically supplies the Spira with fuel.

How the boiler works

On start up the auger feeds the wood pellets from the hopper into the burner where it is lit by an ignition element. The burner output Biomass Boilermodulates to achieve the set temperature by controlling the feed rate of pellets. The fan in the burner propels hot gas generated from the fuel into the Spira’s primary heat exchanger. The heat energy is then transferred to water from the central heating system, before being circulated around house to radiators/underfloor.

It is important to note that in modern pellet boilers, biomass boilers, up to 20% of the energy that is produced is lost to the atmosphere through waste gases exhausted by the flue system, The Spira has a unique secondary condensing heat exchanger which has been designed to capture some of this lost latent heat enegy, so it can maintain extremely high efficiencies.

The boiler’s fully automatic cleaning system will periodically wash the condensing unit of any debris in the tubes and also activate the brazier within the burner to clear the combustion chamber of ash build up, which reduces maintenance time.


Please email or telephone for more information on  Biomass Boiler intsallation.