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Central Waterless Composting Toilet Systems

Centrex Waterless Systems use a tough but elegant Sun-Mar Dry Toilet designed in fibreglass and available in either bone or white. The dry toilet comes with a removable bowl liner for easy cleaning, and is connected to the Centrex Waterless Composting unit by means of a 10" diameter pipe.

Odor-free operation is maintained by a fan, which pulls air down through the toilet seat and up the vent stack. Centrex Waterless Systems can only be used where the toilet can be placed directly above the composting unit.

Sun-Mar Waterless Systems are available in Centrex 2000 and Centrex 3000 models. Centrex 2000 models are ideal for medium to heavy seasonal use or light residential use. Centrex 3000 models are designed for heavy seasonal use or regular residential use.

NOTE: Advertised composting capacities can be doubled for short periods as often as once a month.


Specifications and Rough-in Dimensions

Click here for specifications and rough-in dimensions.


Centrex 2000 AF (AirFlow)

Centrex 2000 AF Central Composting Toilet SystemThe larger composting drum in the Centrex 2000 AF (Air Flow) allows a longer composting cycle, and larger waste volumes than the 1000 units. The increased surface area in the evaporating chamber also provides better evaporation.

When used seasonally by up to 9 adults, compost will normally only need to be removed once a year in the spring. If used continuously in a residence, the drum will need to be rotated backwards to empty some compost into the finishing drawer once every few months.

The Centrex 2000 AF is designed for use with a Sun-Mar dry toilet purchased separately here. This unit is ideal for those who do not have water, but still want the composting action to take place outside of the bathroom area.

The Centrex 2000 AF is normally able to evaporate all liquids, so the drains must be connected only when in heavy use (i.e. use at or over maximum capacity, or residential use) or if prolonged power outages are expected.

The Centrex 2000 AF features a 370 watt thermostatically controlled heater in a sealed compartment under the unit and the standard Sun-Mar 30 watt turbo fan, with a 2" vent stack to remove the evaporate and fresh odors.

The Centrex 2000 AF is supplied with a 45" pipe piece (10" diameter). This is long enough if the floor of the bathroom is up to 81.5" above the surface that the composter is placed on. The pipe piece can be cut to size and additional pieces ordered if necessary.

This unit should evaporate all liquid unless it is being used heavily. A 1" drain hose is supplied for hooking up the drain in any case, since we recommend it for most residential use or heavier cottage use. Please click here for more information on handling excess liquid.

PLEASE NOTE: Effective January 2011, the Centrex 2000 AF consists of two parts - a Centrex 2000 and an AF Waterless kit.

Composting Capacity: 4-6 Residential, 6-8 Weekend/Vacation Use

Voltage: 110

Unit Price: $2,124.00 CAD (Canadian Dollars) plus shipping

Shipping Cost: Please call us at 1-888-248-9754 or for a shipping quote


Centrex 2000 AF NE (Non-electric)

Centrex 2000 AF NE Central Composting Toilet System The Centrex 2000 AF NE (Air Flow Non-Electric) is designed for use with a Sun-Mar dry toilet purchased separately here. This unit is ideal for those who do not have water, but still want the composting action to take place outside of the bathroom area.

The Centrex 2000 AF NE is the non-electric version of the Centrex 2000 AF, and is fitted with a 4" vent stack. Installation of a 12 Volt fan is required on this model, and one is included in the box.

The Centrex 2000 AF NE is supplied with a 45" pipe piece (10" diameter). This is long enough if the floor of the bathroom is up to 81.5" above the surface that the composter is placed on. The pipe piece can be cut to size and additional pieces ordered if necessary.

With the lower evaporating capacity due to the lack of an electric heater, the overflow drain should be installed with this unit as there will be overflow liquid. Please click here for more information on handling excess liquid.

PLEASE NOTE: Effective January 2011, the Centrex 2000 AF NE consists of two parts - a Centrex 2000 NE and an AF Waterless kit.

Composting Capacity: 3-5 Residential, 5-7 Weekend/Vacation Use

Voltage: N/A, Optional 12 Volt Fan

Unit Price: $1,924.00 CAD (Canadian Dollars) plus shipping

Shipping Cost: Please call us at 1-888-248-9754 or for a shipping quote


Centrex 2000 AF AC/DC

Centrex 2000 A/F AC/DC Central Composting Toilet SystemPerfect for medium to heavy seasonal or light residential use, the Centrex 2000 AF AC/DC allows for both a longer composting cycle, and larger waste volumes. The increased surface area in the evaporating chamber coupled with the larger heating element also provides better evaporation when the unit is on AC power.

When used seasonally by up to 7-9 adults, compost will normally only need removing annually each spring. In residential use compost will have to be extracted more frequently.

The Centrex 2000 AF AC/DC combines the features of the non-electric and electric units to produce a hybrid unit that will be ideal for those anticipating 110 volt power in the future, those who are in an area that sees frequent power outages, or those who would like to take advantage of the evaporative capacity of the heater when 110V electricity is available.

Even with the evaporation capacity, the overflow drain should be installed with this unit as there will be overflow when the unit is being used in DC mode, and when it is used to maximum capacity in AC mode.

The Centrex 2000 AF AC/DC is designed for use with a Sun-Mar dry toilet purchased separately here. This unit is ideal for those who do not have water, but still want the composting action to take place outside of the bathroom area.

The Centrex 2000 AF AC/DC is supplied with a 45" pipe piece (10" diameter). This is long enough if the floor of the bathroom is up to 81.5" above the surface that the composter is placed on. The pipe piece can be cut to size and additional pieces ordered if necessary.

The Centrex 2000 AF AC/DC requires that 2 vent stacks be installed to handle the separate venting functions. The 2" vent is in use when the AC fan is in operation, and the 4" vent is venting the unit passively when there is no power available.

As an extra option, we include a 12 Volt 1.4 Watt fan with the Centrex 2000 AF AC/DC. You may want to install this fan if the unit is to see maximum capacity use, and you should install the 12 Volt fan if you have to put any bends in the 4" vent stack, as you will then lose the "chimney effect" advantage of a vertical stack, and will need to provide air movement with the fan.

While in AC operation, the unit should not require that an overflow drain be connected, unless it is being used heavily. While in DC operation, the overflow drain should be connected. Click here for more information on handling excess liquid.

PLEASE NOTE: Effective January 2011, the Centrex 2000 AF AC/DC consists of three parts - a Centrex 2000, an AF Waterless kit, and an AC/DC kit.

Composting Capacity:

In AC mode: 4-6 Residential, 6-8 Weekend/Vacation Use
Voltage: 110

In DC (non-electric) mode: 3-5 Residential, 5-7 Weekend/Vacation Use
Voltage: N/A, Optional 12 Volt Fan

Unit Price: $2,297.00 CAD (Canadian Dollars) plus shipping

Shipping Cost: Please call us at 1-888-248-9754 or for a shipping quote


Centrex 3000 AF (Air Flow)

Centrex 3000 A/F Central Composting Toilet SystemThe Centrex 3000 AF (Air Flow) has a continuous compost flow design for very heavy cottage or medium residential use. With a continuous flow system, rotation of the drum moves compost along the larger and longer 3000 series drum, before it drops automatically into the collection housing at the end of the unit.

Under normal operating conditions the drum will not have to be turned backwards for emptying.

When used seasonally by up to 10 adults, compost will normally only need to be removed annually at the beginning of the following season.

The Centrex 3000 AF features a 370 watt 120 volt thermostatically controlled heater in a sealed compartment beneath the unit coupled with the standard Sun-Mar 30 watt turbo fan and 2" vent stack.

The Centrex 3000 AF is designed for use with a Sun-Mar dry toilet purchased separately here. A 45" pipe piece (10" in diameter) is supplied with the unit. This is long enough if the floor of the bathroom is up to 81.5" above the surface that the composter is placed on. The pipe piece can be cut to size and additional pieces ordered if necessary.

All 3000 series units are supplied with a 1" drain hose which should be connected to the 1" drain at the bottom left of the unit. Please click here for more information on handling excess liquid.This particular model should be able to evaporate all liquids as long as the heater is on, and it is not being used heavily, so an overflow drain may not be necessary.

PLEASE NOTE: Effective January 2011, the Centrex 3000 AF consists of two parts - a Centrex 3000 and an AF Waterless kit.

Composting Capacity: 5-7 Residential, 8-10 Weekend/Vacation Use

Voltage: 110

Unit Price: $2,334.00 CAD (Canadian Dollars) plus shipping

Shipping Cost: Please call us at 1-888-248-9754 or for a shipping quote


Centrex 3000 AF NE (Non-electric)

Centrex 3000 AF NE Central Composting Toilet SystemThe Centrex 3000 AF (Air Flow) NE (Non-Electric) employs continuous flow design for very heavy cottage or medium residential use. With a continuous flow system, rotation of the drum moves compost along the larger and longer 3000 series drum, before it drops automatically into the collection housing at the end of the unit.

Under normal operating conditions the drum will not have to be turned backwards for emptying.

When used seasonally by up to 10 adults, compost will normally only need to be removed annually at the beginning of the following season.

The Centrex 3000 AF NE features a 4" vent stack which is used to vent the unit passively. We also include a 12 volt 2.4 watt fan that is required in the vent stack to assist airflow.

The Centrex 3000 AF NE is designed for use with a Sun-Mar dry toilet purchased separately here. A 45” pipe piece (10" in diameter) is supplied with the unit. This is long enough if the floor of the bathroom is up to 81.5" above the surface that the composter is placed on. The pipe piece can be cut to size and additional pieces ordered if necessary.

All 3000 series units are supplied with a 1" drain hose which should be connected to the 1" drain at the bottom left of the unit. Click here for more information on handling excess liquid.

PLEASE NOTE: Effective January 2011, the Centrex 3000 AF NE consists of two parts - a Centrex 3000 NE and an AF Waterless kit.

Composting Capacity: 4-6 Residential, 7-9 Weekend/Vacation Use

Voltage: N/A, Optional 12 Volt Fan

Unit Price: $2,124.00 CAD (Canadian Dollars) plus shipping

Shipping Cost: Please call us at 1-888-248-9754 or for a shipping quote


Centrex 3000 AF AC/DC

Centrex 3000 A/F AC/DC Central Composting Toilet System The Centrex 3000 AF (Air Flow) AC/DC composting toilet system has a continuous flow design for very heavy cottage or medium residential use. With a continuous flow system, rotation of the drum moves compost along the larger and longer 3000 series drum, before it drops automatically into the collection housing at the end of the unit.

Under normal operating conditions the drum will not have to be turned backwards for emptying.

When used seasonally by up to 10 adults, compost will normally only need to be removed annually at the beginning of the following season. If needed, additional collection chambers are available for long term compost storage.

The Centrex 3000 AF (Air Flow) AC/DC features a 370 watt 120 volt thermostatically controlled heater in a sealed compartment beneath the unit coupled with the standard Sun-Mar 30 watt turbo fan and 2" vent stack. These items help to evaporate urine when the unit is being used in AC mode.

The Centrex 3000 AF AC/DC also features a 4" vent stack which vents the unit when no electricity is present. We also include a 12 volt 1.4 watt fan that we strongly suggest installing in the vent stack, especially if you need to put a bend in the vent as shown in the diagram.

The Centrex 3000 AF AC/DC is designed for use with a Sun-Mar dry toilet purchased separately here. A 45" pipe piece (10" in diameter) is supplied with the unit. This is long enough if the floor of the bathroom is up to 81.5" above the surface that the composter is placed on. The pipe piece can be cut to size and additional pieces ordered if necessary.

All 3000 series units are supplied with a 1" drain hose which should be connected to the 1" drain at the bottom left of the unit. This unit should be able to evaporate all liquids while operating in AC mode with the heater on. Drains should still be connected for heavy use or use in DC mode. Click here for more information on handling excess liquid.

PLEASE NOTE: Effective January 2011, the Centrex 3000 AF AC/DC consists of three parts - a Centrex 3000, an AF Waterless kit, and an AC/DC kit.

Composting Capacity:

In AC Mode: 5-7 Residential, 8-10 Weekend/Vacation Use
Voltage: 110

In DC Mode: 4-6 Residential, 7-9 Weekend/Vacation Use
Voltage: N/A, Optional 12 Volt Fan

Unit Price: $2,507.00 CAD (Canadian Dollars) plus shipping

Shipping Cost: Please call us at 1-888-248-9754 or for a shipping quote

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