Experiments on attached-growth circulating reactor were conducted to determine the impact of variable heat energy of the reactor packing on nitrification rate. There was a possibility of regulation the packing temperature. The research was carried out for biofilm temperatures from 10oC to 35oC at ambient temperature of 10oC. The increase in packing temperature from 10oC to 30oC caused the increase in nitrification rate from 3.57 gN?m-2?d-1 to 10.1 gN?m-2?d-1. The increase in temperature over 30oC caused the decrease in process rate. Appointed values of temperature coefficient ? for nitrification decreased by increasing in heat energy of packing. The supply of heat energy to biofilm directly through the reactor packing permitted to improve the nitrification effectiveness.