Yep, you will want to properly winterize it. Since you haven’t already pumped antifreeze into your system, you can follow these instructions (taken from the SPlendide 2100XC owner’s manual).
If you are currently pumping antifreeze through your fresh water system:
1. With machine power OFF, turn WASH TEMP knob to ‘HOT’.
2. Advance Cycle Selector to position ‘3’.
3. Press ON/OFF button, then press START. Let machine fill until the drum turns (could take up to 1 to 2 minutes).
4. Press ON/OFF button to turn power OFF.
5. Advance Cycle Selector to ‘Spin’.
6. Press ON/OFF button, then press START.
7. After letting antifreeze drain completely from drum, press the ON/OFF button to turn power OFF.
Here’s a link to the Splendide 2100XC quick start guide for more info. Might be a good idea to print it off and keep it in your RV. https://www.splendide.com/downloads/QR-RV_2100XC_QuickOp_Winterize.pdf