[Jolly Amaranto]

I installed an electric one in a vacation cabin where there was little space for a tank heater. It automatically shuts off if the flow rate drops below a certain point so that it will not overheat the water. I started out with a low flow, "water saver" shower head. It was found that if too much cold water was turned on, it would back up in the shower head and impede the hot water flow through the coils in the heater causing it to shut off. Things got real cold real quick. With water supplied from a well with a pump and pressure tank, the water pressure would vary from 20 to 40 PSI causing all kinds of challenge maintaining a constant temperature at the shower head. By switching to a higher flow shower head, temperature control improved greatly.