Grant Spira Condensing Range

The new highly efficient Grant Spira Condensing Wood Pellet Boilers utilises Grant's award winning patented stainless steel tubulator baffle system, which is featured in Vortex Condensing oil fired boilers.

The boilers are available in outputs of 15-26kW with an efficiency 97.4% gross and 26-36kW with an effciciency of 93.1%.  

They come complete with a 110kW hopper which automatically supplies the Spira with fuel.

How the Spira Works

An auger feeeds the wood pellets fom the hopper into the burner head where it is lit by an ignition element. The operation of the boiler is fully automatic. The intelligent micoprocessorswithin the boiler also control the feed aufer, flue fan, boiler temperature and cleaning system. 

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 system which is contained within, before being circulated around the house through the radiators / underfloor system.

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

THe boiler's cleaning system will periodically wash the condensing unit of any debris in the tubes and also actiavte the brazier within the burner to clear the combustion head of ash build up, which reduces maintenance time.

Grant Black Flue System 

(more to follow)