We have an E23 and are in an area is southeast where it will be below freezing the next 3 or 4 nights. I put heating pads on the 3 tanks ( no spray foam) but I’m concerned about the 2 low point pex drain lines. They are about 5 1/2 feet long with connections up to the sink area on one end and directly to the water heater and cold water on the other end with metal spigots. No easy way to add insulation I think. So should I leave them slightly dripping at night? Temps will get above freezing later each morning