A cold bathing water to toilet diverting apparatus includes a diverter that is configured to be fluidly couplable to a bathing water conduit. The diverter is positionable between a shut off valve and a spout each fluidly coupled to the bathing water conduit. An outlet conduit is fluidly coupled to the diverter. The diverter diverts water from the bathing water conduit and into the outlet conduit when the diverter detects water in the diverter having a temperature less than a threshold temperature. A storage tank is fluidly coupled to the outlet conduit to receive water from the diverter. An auxiliary conduit is fluidly coupled to the storage tank and is configured to be fluidly coupled to a toilet's water tank to allow the storage tank to supply water to the water tank through the auxiliary conduit.

A sensing unit for detecting an amount of liquid stored in a storage chamber is configured so that: a direction of a first moment which is a moment about a shaft produced by self weights of a rotating member, a float, and a receiver is a direction in which the float is moved from a first position to a second position vertically below the first position; and a direction of a resultant moment obtained by combining a second moment, which is a maximum moment about the shaft produced when the receiver receives liquid supplied to the storage chamber, and the first moment is a direction in which the float is moved from the second position to the first position.