To provide a heat source device capable of notifying a user of the fact of reducing a quantity of heating medium in a heating medium circulating flow passage in the proper timing by a proper method.
This heat source device 1 includes a heating medium flow system 15, and a combustion part 10. Liquid level detecting electrodes 52 and 53 for detecting the quantity of heating medium are arranged in an expansion tank 32 arranged in the heating medium flow system 15. In the heat source device 1, the notifying timing by a sounding notifying means is delayed until a sounding prohibiting time zone passes when the time is within the sounding prohibiting time zone in the timing when a liquid level in the expansion tank 32 is less than a notifying reference liquid level Al detectable by the liquid level detecting electrode 52.
NAGAO HIDEYA
TANAKA HIROAKI
KAMIYA NOBUYOSHI
KONO NAOKI
KURIYAMA TETSUNORI
