FireBird Bio-Tec Manual page 29

Accumulation Tank
• A suitably sized accumulation tank MUST be used
with the Bio-Tec boiler.
• The recommended sizing is a minimum of 50 litre of
per 1kW of boiler output, e.g. a 35kW boiler would
require a 1750l tank
• Why
– When filled a Bio-Tec 35Kw holds between 30Kg and
50Kg of wood (depending on wood type)
– Energy content of 1Kg of wood = 14.5MJ/Kg
= 4kWh/Kg
– Energy content of 50Kg of wood = 50Kg x 4kWh/Kg =
200kWh
– 200kWh of inputted energy would heat 2000l of water
from 15ºC to 85ºC (allowing for boiler & system losses)