Dangane da babban darajar calorific, abubuwan hasara a cikin hanyar asarar zafi sune:
1. Busassun hayaki asarar zafi.
2. Rashin zafi saboda samuwar danshi daga hydrogen a cikin man fetur.
3. Rashin zafi saboda danshi a cikin man fetur.
4. Rashin zafi saboda danshi a cikin iska.
5. Flue gas m zafi asarar.
6. Rashin cikar zafi mai ƙonewa.
7. Superposition da conduction zafi asarar.
8. Rashin zafi bututu.
Bambanci tsakanin ƙimar calorific na sama da ƙananan ƙimar calorific ya dogara ne akan ko an saki latent zafi na vaporization na ruwa tururi (kafa ta dehydration da hydrogen konewa).Wato ingancin zafin na'urorin injin tururi bisa ga taurari masu zafi ya ɗan ragu kaɗan.Gabaɗaya an ƙayyade cewa an zaɓi man da ke da ƙarancin kuzari, saboda tururin ruwa a cikin iskar hayaƙin ba ya takura kuma baya sakin latent zafi na vaporization yayin aiki na ainihi.Koyaya, lokacin da ake ƙididdige asarar shaye-shaye, tururin ruwa a cikin iskar hayaƙin ba ya haɗa da latent zafi na vaporization.