John, there have been problems with the sand heater being left unattended while hot over the years. Some Friends members have mentioned that they had to rebuild the roof around the flue of the sand heater twice because it caught fire from probably over firing the stove. They are not sad it is not being used as we have better things to do other than re roof the sand house.
As far as the sand lifter, it is now operational again. Several years ago, it was plugged up and didn't work. A couple of Friends members took the thing apart and found a dead RAT in the pipe. They shot him, (or what was left) out with compressed air. Now it has the nickname of 'ratapult'. Amazing how well it works now...