A domestic hot water supply system, comprising a water heater, a cold water pipe and a hot water pipe connected to the water heater respectively at one end, wherein the cold water pipe is connected to a water main at another end, and one or more water points are arranged in parallel between the cold water pipe and the hot water pipe, wherein a water pump is arranged between the water heater and the water point closest to the water heater on the hot water pipe, the water pump has a control module, the control module includes a signal receiver, a check valve is disposed at a farthest water point from the water heater between the cold water pipe and the hot water pipe, and a temperature sensor is disposed on the side of the check valve adjacent to the hot water pipe, the temperature sensor includes a signal transmitter.

A water production system including a radiative cooling/heating unit comprising an oscillating heat pipe (OHP) heat spreader, wherein the radiative cooling/heating unit lowers the temperature of the OHP heat spreader to a temperature below the temperature of the ambient environment in which the water production system is disposed. The system additionally including a first OHP heat exchanger thermally connected to the OHP heat spreader such that the first OHP heat exchanger will acquire substantially the same temperature as the OHP heat spreader, and a second OHP heat exchanger thermally connected to the OHP heat spreader such that the second OHP heat exchanger will acquire substantially the same temperature as the OHP heat spreader. The system further includes a rotatable OHP water absorption bed disposed in thermal contact with the radiative cooling/heating unit such that the OHP absorption bed will acquire substantially the same temperature as the OHP heat spreader.

A water recycling system embodying a tank used for collecting and recycling bathroom shower warm up water for other household needs. The collection tank is fluidly connected to the shower head via an engaged diverter valve by way of a first conduit. The collection tank may provide a second conduit and valve system operatively associated with the collected warm up water to the toilet or other household water needs.

A cool water discharging method and a switch valve includes a valve body and a valve spool. The valve body is disposed with a thermosensitive module, an inlet passage, a first outlet passage, and a second outlet passage. The valve body has a cool water discharging passage connected to the inlet passage, a discharging hole connecting the first outlet passage and the cool water discharging passage and an air suction hole connecting the second outlet passage and the cool water discharging passage. When discharging cool water, water flows to the cool water discharging passage rapidly, the air in the second outlet passage is absorbed to the cool water discharging passage. The residual cool water in the second outlet passage is absorbed to the cool water discharging passage through the air suction hole and discharged out with the residual cool water in the first outlet passage.

Presented is a water saving system that includes an auxiliary tank, a diverter valve having an inlet port that operationally connects to a preexisting pipeline system to draw water restrained or flowing through the pipeline system, a first outlet port that operationally connects to the auxiliary tank using a pipe for storage of water, and a second outlet port that operationally connects to an ablutionary installation such as a shower head for showering. The system further includes a thermostat element disposed within the valve body, and a temperature adjuster rotatably configured in the valve body that enables a user to set a specific temperature based on which the diverter valve can switch the flow of water arriving from the preexisting pipeline system to either the first outlet port for storage in the auxiliary tank, or the second outlet port for showering via the shower head.

A recirculation pump system provides the ability to recirculate water from a water heater outlet, back into a water heater inlet through a cold-water supply line. The recirculation pump system pumps heated water, which may have cooled to a sub-optimal temperature, into a water heater. The recirculation pump system provides the ability to use a plumbing network that does not contain a dedicated recirculation line. The recirculation pump system uses a water pump to circulate water, a temperature sensor to control system activation based on water temperature, and a check valve to control the direction of fluid flow. This recirculation pump system provides a minimally invasive way to install a recirculation system into a plumbing network that otherwise would not be able to accommodate recirculation functions, and service modern plumbing fixtures efficiently.

According to embodiments of the present disclosure is a water delivery system that continuously flows and recirculates clean water, diverting only water that has touched a user's hands. No sensing is required to activate the water flow and the actions of the user effectively divert the dirty water to a drain. The water delivery system comprises a clean water outlet, a clean water inlet, a dirty water drain, and a circulation pump. A stream of water continuously flows from the outlet and is received by the water inlet if the stream is uninterrupted. If the stream is disturbed, such as by the hand washing activities of the user, the stream is diverted from the inlet and instead falls into a sink and into the drain.

A cold water recycling and reusing apparatus includes a water inlet pipe, a cold water recycling apparatus, a recycling pipe, a cold water return apparatus, a return pipe, a recycling container, and a water outlet terminal. The cold water recycling apparatus is installed at a location near the water outlet terminal. The cold water return apparatus is installed at a location behind the cold water recycling apparatus. The cold water recycling apparatus enables cold water to flow into the recycling container via the recycling pipe. The cold water return apparatus draws the water in the recycling container into the water inlet pipe via the return pipe. The water is adapted to mix with hot water and flows out of the water outlet terminal.

Methods, systems, and devices are disclosed for implementing a water saving mechanism. In one aspect, a reservoir is provided to collect cold water while hot water is being heated. Once a desired temperature is reached, a valve is actuated to allow water to bypass the reservoir and be dispensed through a shower head. The reservoir can be used to dispense the cold water at a later time.

A programmable system with user interface control for water flow rate or water temperature. Embodiments of the invention include a water temperature control system for a shower.