Combustion device and water heater

A combustion device (3)includes a solenoid valve (51) configured to open and close an inflow port (43) and an additional solenoid valve (52) configured to open and close a communication port (44) selectively mountable at an upstream end of a distribution flow passage (68) with a small number of nozzles (30). When the additional solenoid valve (52) is mounted, a state of supplying a fuel gas to only a distribution flow passage (67) with a large number of the nozzles (30) by opening the solenoid valve (51) and closing the additional solenoid valve (52) and a state of supplying the fuel gas to two distribution flow passages (67,68) by opening the solenoid valve (51) and opening the additional solenoid valve (52) are mutually switchable. When the additional solenoid valve (52) is not mounted, a state of supplying the fuel gas to the two distribution flow passages (67,68) by opening the solenoid valve (51) and a state of not supplying the fuel gas are mutually switchable. 6 1 612 6 13 25, 26-- @ @ @ ~-- -17