Efficient showerhead with purge outlet

A hot water system, comprising:

• a water valve biased toward an open position and coupled between a hot water supply inlet and a purge outlet, the water valve configured to move between the open position and a closed position;
• wherein, when the hot water system operates in a first mode, the water valve is in the open position, the hot water system purges water from the hot water supply inlet through the purge outlet and through a hot water outlet, and water passes through the hot water system at a first volumetric flow rate;
• wherein, when the hot water system operates in a second mode different from the first mode, the water valve is in the closed position, the water valve blocks at least a majority of the water entering the water valve from passing through the purge outlet, and water passes through the hot water system at a second volumetric flow rate less than the first volumetric flow rate and greater than zero;
• and
• wherein the water valve is configured to automatically switch from the first mode to the second mode when a temperature within the water valve rises above a predetermined temperature.

A hot water system, comprising:

• a water valve coupled between a hot water supply inlet, a hot water outlet, and a purge outlet;
• wherein when the hot water system operates in a first mode, water passes through the hot water system to the purge outlet at a first volumetric flow rate;
• wherein when the hot water system operates in a second mode different from the first mode, water passes through the hot water system to the purge outlet at a second volumetric flow rate less than the first volumetric flow rate and greater than zero;
• and
• wherein the water valve is configured to automatically switch from the first mode to the second mode and stop at least a majority of water flow through the hot water system when a temperature within the water valve rises above a predetermined temperature.