We removed the temporary 18 KW electric tankless and installed the 24KW electric tankless that fits the profile of the original. This was a straightforward swap, We removed the temporary water heater and installed the lake and kind from when we were originally here, testament turning the power off to the unit removing the front cover and disconnected the power supply and the water lines. Removed unit from the wall, reebok stop temporary water heater back in its original package. We cut some wood for anchors amount of them on the wall to support the new electric tankless. Secure the new 24KW water heater to the wall reconnected electrical lines and reattach the isolation drain down valves. Slowly turn the water back on while bleeding all the air through the unit out of the kitchen sink. Turn the power back on replace cover set unit to 124° tested at the sink and got 135°. There is no warranty or guarantee on owner supplied fixtures or appliances Recommendation February 2024 have unit