Sun-Mar units serve
as a reliable year-round facility when prepared for continuous or
periodic use during the cold winter months. All units are made of
fiberglass and marine grade stainless steel; so even if the
compost freezes in the drum, sub-zero temperatures will cause no
For limited use in
cold temperatures, the unit can be used simply as a holding tank.
For this, sufficient space must be available in the Bio-drumTM
and the drum should not be rotated if it contains frozen compost.
Electric units should be plugged in when in use, so that the fan
eliminates all odors even though no composting is taking place.
If you have a 1 pint
low flush toilet, and freezing is expected, turn off the water
supply to the flush toilet, and drain any water by loosening the
brass nut on the water valve.
For continuous or
extended use in winter, the composting unit will have to be kept
warm (at least 55o - 60o F) so the compost
does not stop.
- Insulate all piping to avoid
ice blockage including vent stacks (on all units), and waste
inlet and drain piping where appropriate.
- While the composting unit is
not in use, energy costs can be reduced by installing a speed
control on the fan so that very little cold air is being
pulled in and the heater is operating less frequently.
- Keep self-contained electric
units plugged in if they are in a cold place. If a
self-contained unit is being operated in an unheated space,
consider putting a blanket over the unit to keep the unit
insulated and further reduce heating costs. Please note that
this will not be enough to bring the unit up to a proper
- Keep central units plugged in