reply to mepadre
Re: Sump Pump - Discharge riser freezing How about installing a vent of some sort in the door? One that can be opened during the coldest days, allowing just enough warm air in that space to keep it above freezing.
I did this in a wall down in the basement to prevent a spigot from freezing. I cut through the drywall and installed a typical furnace vent, but the piping is behind it, and the warm air from the room keeps that space warm enough to prevent any freezing. I keep the vent open during the cold months and close it when it warms up.
I posted pictures some time ago, but I can't remember the thread.