My nephew lives outside of Dallas and his tankless water heater froze because it was installed OUTSIDE .I love the way you can stand up a level and look down on the pool. Glad you survived the week of TX freezing weather, rolling blackouts which weren't so rolling. That was a difficult week for us, too. We never lost power but our tankless water heater froze up. Two days later a plumber came and we now know it was installed without insulation in an outside garage wall. Thankfully our equipment pad only had the filter pump hooked up. Many lost their pool heaters over here, including our pool designer. Even the experts were hit!
I can't wait to see how everything's coming along.