just installed panasonic DH-3MP1 today. i notice that the dc pump starts running as soon as i power on the device and without any water. is this normal?

before this using alpha ac pump shower heater. pump will only run when water is turned on and will auto stop when water is turned off.

worried if i forget to turn off the power, dc pump will run throughout the whole night.

yup, can turn off the dc pump if i use the push switch on the unit, or if i turn off the breaker switch.

but im just wondering whether normal for dc pump to start running even without water supply (with both switch and breaker on). i though pump will only start when power and water is supplied.

i usually dont have a habit to turn off the switch at shower heater, only turn off breaker once i come out of the bathroom. sometimes i forget so breaker can be turned on for a few hours. if this is the case then dc pump will run for few hours also

based on my experience. i've used alpha ac pump and panasonic dc pump. pressure wise i dont feel there's a big difference. however, noise difference is "sky and earth"

yeah i think better confirm with panasonic
although it would be good to switch off the switch at the unit after using.

nah. been using it ever since without problems. just need to remember to turn off the switch at the heater after use.