I want to use this in a summer cottage. the pex water system is drained for the winter. will the water drain from the unit so no damage will happen?

Yes, ONce the water is off or drains the unit does not hold water in it.

Under a moderate flow rate, is the temperature controlled by reducing the current flow or does the heating element(s) turn on/off/on/off?

No, this thermoflow Elex 18 model adjusts the temperature by reducing the power , not the flow rate . You just simply adjust the temperature on the LCD panel .

I have installed the elex 18 and the main screen will not turn on when plugged in any answers?

Thanks for your consultation, please check if the power lines hooked up, Installation Guide Video Link: https://youtu.be/4PQa6mxSTNU If you have any problem please just feel free to contact us. Inquiry & after sales service: support@thermoflowus.com Hot line:＋1（844）334-4203 Regards thermoflow customer service

Everything checks out and wired correctly but our screen just beeps and flashes and says 188 degrees may be damaged in shipping?

Thanks for your consultation, the problem may be caused by poor contact from the LED display with the motherboard. Step 1: Turn off the breaker then turn on to check if the LED display works well; Step 2: If step 1 is not work, then turn off the breaker and take off the panel, re-plug the link between the LED display with the motherboard again. If all the solution can't solve the problem, please just contact our customer service. Inquiry & after sales service: support@thermoflowus.com Hot line:＋1（844）334-4203 Regards thermoflow customer service.

Brand	thermoflow
Wattage	18000 watts
Voltage	240 Volts
Maximum Operating Pressure	115 Pound per Square Inch
Manufacturer	thermoflow
UPC	691608874812
Item Weight	11.08 pounds
Package Dimensions	19.96 x 11.73 x 6.97 inches
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Batteries Included?	No

Thermoflow Elex 18 Electric Tankless Water Heater,18kW at 240 Volts, Instant Hot Water Heater with Self-Modulating Temperature Technology

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