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Sun-Mar Self Contained Composting Toilets

Composting toiletThese toilets are the ideal solution for remote camp or cabin where the cost of putting in a conventional septic system isn't feasible or possible. They're also great for a basement where a conventional toilet would be costly, boat, or bunkhouse. They're simple to install and maintain and they're environmentally friendly.

Hill View Mini Barns sells 4 of the most popular Sun-Mar composting toilets - The Compact, and 3 models of the Excel Style. Both of these styles are self contained meaning there is no storage aside from the toilet itself. Depending on the use(please see the specs for each model) they are great for occassional or full-time use.

    Features:
  • Water Free
  • quick & easy to install
  • Easy to winterize
  • Economical because they are one piece systems
  • Electrical units can normally evaporate all liquids
  • Easy to clean having a durable shiny finish

The Compact Composting Toilet- $1,785

The Compact is an elegant low profile unit with the looks to complement any bathroom. Sun-Mar engineers designed this low profile toilet by developing and patenting a new variable diameter Bio-drum which is small at the front and large at the rear. To maintain the uninterrupted lines of the Compact, a patented Bio-drum handle recesses into the body of the unit to mix and aerate the compost.

The Compact differs from the Excel in that all three chambers are smaller, which makes the Compact ideally suited to light residential or light to medium cottage use.

As with the Excel, a 2" vent stack attaches to the rear of the Compact. A 1/2" emergency drain at the rear offers protection against heavy or residential use, or prolonged power outage.

Compact composting toilet
The Excel Electric Composting Toilet- $1,845

The Excel is the best-selling unit in North America and for good reason. It is a high capacity Bio-drum toilet that is very simple to operate, features well proven technology and is extremely reliable. The Excel was the first ever self-contained composting toilet to be certified by the National Sanitation Foundation (NSF). So, when you purchase an Excel, you are literally purchasing a composting toilet that sets the standard.

The Excel has enough capacity that it can be used just about anywhere; in residences, cottages and even in light commercial applications.

To simulate residential use the Excel was tested by the National Sanitation Foundation (NSF) at maximum capacity for 6 continuous months, during which the Excel produced no odour and produced a clean, safe compost. Only Sun-Mar self-contained units are listed for residential and cottage use by NSF, whose Standard #41 is the toughest composting performance standard in the world.

The 2" vent is attached at the top back of the Excel and can be installed invisibly by running it through the wall and up the outside wall. For comfort the Excel has a sturdy detachable footrest which can be removed to pull out the finishing drawer.

In normal use the Excel can normally evaporate all liquids, however a 1/2" emergency drain is fitted at the rear and this should be connected if the unit is to be used residentially or heavily, or if prolonged power outages are expected.

Excel composting toilet
The Excel N/E (Non Electric) Composting Toilet- $1,645

The success of the Excel design meant that a three chamber unit could be specifically designed for those with NO continuous 110 volt supply. First launched in 1981, the Excel NE has long been the standard toilet for those living off the grid. A 1998 redesign gave the unit a rounded look, and recessed the drum handle.

The Excel has enough capacity that it can be used just about anywhere; in residences, cottages and even in light commercial applications.

The Excel NE has no fan or heater. Odorless operation is achieved by a 4" vent mounted at the top rear of the unit which acts like a chimney on a wood stove. For good air movement the vent should be installed vertically and to 2-3 feet above the peak of the roof.

The optional 12 Volt Fan should be installed if you need to install the toilet with any bends in the vent. No more than 2 45° bends are encouraged, even with the fan.

If the Excel NE is used residentially or heavily, or is in a place which is subject to downdraft, the optional 12 volt fan should be installed in the vent stack. This fan draws 1.4 watts and can be powered by a solar panel and 12 volt marine battery.

Evaporating capacity on the Excel NE is variable, so the 1" drain at the rear should be connected to an approved drain pit, container, or other facility. Please click here for more information on handling excess liquid.

The Excel AC/DC Composting Toilet- $1,775

The Excel AC/DC is a standard 115 volt Excel unit, but with 1" safety drains at the rear and dual (2" and 4") vent stacks.

The unit uses the regular 2" vent when 115 Volt power is available and defaults to the 4" NE vent when it is not.

A 12 volt 1.4 watt fan is included for use in the vent.

The Excel AC/DC is for those with generators operating over 12 hours per day, or for people that expect to have continuous 110 volt power available in the future.

The 1" overflow drain on the Excel AC/DC should be connected if the unit is being used heavily in AC mode, and if it is being used in DC or non-electric mode. It will only evaporate all liquids while working in the AC mode continuously. Click here for more information on handling excess liquid.



Download and print our composting toilet brochure here: Composting Toilet Brochure

Call 269-2800 or 375-8200 for more information.

Hill View Mini Barns- Call 207-269-2800 for information
Come browse anytime!

Etna sales and manufacturing
Phone: 207-269-2800 ext. 2
1310 Stage Rd (Rte 2)
Etna, Maine 04434
Office hours:
Monday to Friday, 8-4:00
Saturday 10-1:00
Closed Sundays.
Map to Etna- sales and manufacturing location
Sabattus sales location
Phone: 207-269-2800 ext. 4
242 Middle Rd (Rte 9)
Sabattus, Maine 04280
Office hours:
Monday, Tuesday, Thursday, Friday 9-5:00
Saturday 10-1:00
Closed Sundays.
Map to Sabattus sales location
Lyman sales location
Phone: 207-269-2800 ext. 3
1520 Alfred Rd (Rte 111)
Lyman, Maine 04002
Office hours:
Wed., Thur., Fri. 8-4:00
Saturday 10-1:00
Other days by appointment
Closed Sundays.
Map to Lyman sales location
Holden sales location
Phone: 207-269-2800 ext. 1
247 Main Rd
Holden, Maine 04429
Office hours:
Tues. 9-4, Thurs., Fri. 8-4:00
Saturday 10-1:00
Other days by appointment
Closed Sundays.
Map to Holden display location
Display locations: (feel free to browse and call one of our sales locations for assistance)
Machias Display
Jordan Gardens
272 Main St
Machias, ME 04654
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