Name: Sun-Mar Excel
Brand: Sun-Mar
Price: 2040.00 USD

For cabins and homes on grid power that need a certified toilet for a full time household; its power draw rules out vans and small solar systems.

Price checked October 31, 2026. As an Amazon Associate we earn from qualifying purchases.

Pros

Rated for three adults full time, the most of any self-contained toilet here
NSF/ANSI 41 certified, which smooths permits where health departments ask for it
Composts waste in a turning drum, so you empty finished compost rather than raw solids
No urine bottle to carry out: liquid stays in the unit, with only an emergency drain

Cons

Needs a 120 V outlet and averages about 150 W, too much for most small solar setups
Bulky: 33 in deep and 33 1/4 in high overall, so it needs a roomy bathroom
Three year parts warranty, shorter than the five years on many diverting toilets

The Sun-Mar Excel family

Every Sun-Mar Excel model we rank, smallest first. Ratings compare each against its own type.

Model	Capacity	Rating	Price
Sun-Mar Excel (this one)	3 people	3.1/5	$2,040
Sun-Mar Excel NE	2 people	3.6/5	$1,825

How it scores

The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.

For off-grid cabins that need a certified toilet with no power; plan for a drain line and a tall vent.

$1,825

For grid-powered cabins and cottages that want a hands-off composting toilet: automatic mixing and evaporation with no urine bottle, at a high price.

$2,255

For a small cabin bathroom on grid power with one full time user or occasional guests, where a certified toilet is required.

$1,935