The product labels and instructions indicate that this unit should not be used with fountains and such, but only if it in close proximity, I have 3 fountains that have 12 volt transformers that failed over time, so ran low voltage lighting wire from them to this unit located on a wall. Measured the ac out using a RMS voltmeter and was 11.75 volts, and with a timer I can turn off the fountains for extended life. Nice price and performance for what I will use it for.