抄録
In this report, to examine permissible width of the ambient temperature and the water supply temperature needed in standardizing it for the instantaneous gas water heater, the experiment that variously changed the ambient temperature and the water supply temperature was done. As a result, it was confirmed that the mode efficiency rose by rising of the ambient temperature. On the other hand, it became the result of the mode efficiency's rising by the water supply temperature low when limiting it to the latent heat collection type water heater. In addition, the reproducibility of the experiment was confirmed by measuring the same model with a different experimental apparatus.
