I’ve seen people set up a system that bleeds a small amount of hot water into the line that fills the toilet tank to keep it up to room temperature or thereabouts. The idea is to prevent condensation on the outside of the tank.
All mine are. Buy the mixers at any hardware or plumbing store. Water here comes out of the ground at 35 to 40 degrees. Not good in a 70 degree house.
Additionally, all cold and hot water pipes are wrapped in insulating tubes, one for condensation, one for heat loss. Ditto the pressure tank.
Really need to blanket the home hot water heater sometime - the rental is on-demand...but those major lines are also tube-insulated. In the rental, the pressure tank and Renai on-demand heater are in a very small, confined area and tried to develop moldfrom condensation before I insulated tank and lines.. I also added a $12 soundless fan for air circulation. Problem solved.
