US 12,435,883 B2
Hot water supply device and hot water supply system
Kohei Yamashita, Hyogo (JP); and Shota Mizuno, Hyogo (JP)
Assigned to NORITZ CORPORATION, Hyogo (JP)
Filed by NORITZ CORPORATION, Hyogo (JP)
Filed on Mar. 17, 2023, as Appl. No. 18/185,390.
Claims priority of application No. 2022-067483 (JP), filed on Apr. 15, 2022.
Prior Publication US 2023/0332774 A1, Oct. 19, 2023
Int. Cl. F22B 27/00 (2006.01); F24D 17/00 (2022.01)
CPC F24D 17/0078 (2013.01) 9 Claims
OG exemplary drawing
 
1. A hot water supply device for supplying hot water to a hot water supply destination, the hot water supply device comprising:
a heating mechanism heating a fluid;
an internal path, in combination with an external path formed between two ports of the hot water supply device outside the hot water supply device so as not to include the hot water supply destination, that forms an instantaneous hot water circulation path through which the fluid passes via the two ports and the heating mechanism in an instantaneous hot water operation executed with an actuation of a circulation pump when a temperature of the fluid drops while the hot water supply is stopped at the hot water supply destination;
a flow rate detector arranged in the instantaneous hot water circulation path; and
a control device that controls the circulation pump and the heating mechanism,
wherein the control device:
when the instantaneous hot water operation is started, until a minimum drive time set based on a flow rate detection value of the flow rate detector under a condition that the circulation pump is actuated at a predetermined constant output and the hot water circulation path is formed elapses, actuates the circulation pump at the constant output and actuates the heating mechanism.