First of all: what model year is your Axis? Does it have the demand water heater (tankless) or the old model with a tank?
With a tank your valves may be setup for winter bypassing the water heater. If you do have a tank do not turn the electric heater on until you know you have water going through it--you may burn up the element. (That is a way to know if you have a tank or not as the tankless units don't have the electric option.)
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