NSF Certified Safety
Independently certified for maximum safety and performance.
Odorless Operation
Electric fan and heater eliminate all odors effortlessly.
High Capacity
Supports 3 full-time or 6 part-time users easily.
Energy Efficient
Consumes less power than two small light bulbs.
Sun-Mar Excel Composting Toilet Overview
The Sun-Mar Excel Composting Toilet brings trusted, industry-leading performance to your off-grid or eco-friendly home.
It’s the world’s first NSF-certified self-contained composting toilet—guaranteeing safety and reliability.
Enjoy odorless operation thanks to a built-in electric fan and thermostat-controlled heater. High capacity handles families or groups with ease. Everything you need is included for simple, seamless installation.
Whats Included
- Sun-Mar Excel Composting Toilet Unit
- 4" Vent Kit with External Vent Cap
- 110V Electrical Connection Kit
- Peat Moss Starter Supply
- Complete Installation Hardware
- Comprehensive User Manual
- Warranty Documentation
- Customer Support Access
NSF Certified Performance
The Sun-Mar Excel is the only self-contained composting toilet to achieve NSF Standard 41 certification. That means rigorous third-party testing for safety and performance.
Enjoy absolute peace of mind for your home, cabin, or tiny house, knowing you’re using the most trusted solution available.
Completely Odorless Operation
An integrated electric fan and thermostat-controlled heater ensure 100% odor-free performance at all times.
Your bathroom stays fresh, while advanced composting technology manages waste efficiently and discreetly.
Large User Capacity
Designed for families, cabins, and tiny homes, the Excel offers ample capacity for three full-time users or up to six on weekends.
With maintenance intervals as long as 3-4 months, it’s worry-free living wherever you are.
Compact Footprint
Fits seamlessly into small spaces, making it perfect for cabins, tiny houses, or RVs with limited room.
Easy Maintenance
User-friendly design allows quick, mess-free emptying every 3-4 months for up to 3 people.
Complete Installation Kit
Get everything you need—vent kit, hardware, instructions, and more—for a hassle-free setup.
Sun-Mar Excel Composting Toilet Features
- NSF Certified for industry-leading safety standards and peace of mind.
- Odorless technology ensures fresh, pleasant bathroom experiences every time.
- Serves 3 full-time or 6 part-time users—ideal for families and groups.
- Only 150W average power consumption for energy savings and eco-friendliness.
- Empty as little as every 3-4 months for minimal maintenance.
- All-inclusive package means no surprise purchases or missing parts.
- Backed by a 3-year parts warranty and 25-year bowl warranty for durability.
Sun-Mar Excel Composting Toilet Specs
| Dimensions (W×D×H) | 22" × 33" × 28" |
| Weight | 75 lbs |
| User Capacity | 3 full-time, 6 part-time |
| Power Requirement | 110V, 150W average, 2.4A max |
| Fan | 35W continuous |
| Heater | 250W thermostat-controlled |
| Emptying Frequency | Every 3-4 months (3 users) |
| Certification | NSF Standard 41 |
| Warranty | 3 years parts, 25 years bowl |
| Shipping | Free to Lower 48 states |
Sun-Mar Excel Composting Toilet FAQ
What makes the Sun-Mar Excel NSF certified?
It is the only self-contained composting toilet to pass rigorous NSF Standard 41 testing for safety and performance, providing peace of mind for your home or cabin.
Is installation difficult?
No, the Excel comes with a complete installation kit and clear instructions. Most homeowners find setup straightforward and hassle-free.
Does the Excel really prevent all odors?
Yes! A continuous electric fan and a thermostat-controlled heater guarantee 100% odorless operation in all seasons and climates.
How often does the toilet need emptying?
With three full-time users, you only need to empty the compost every 3–4 months, making maintenance minimal and convenient.
What happens during a power outage?
The Excel continues to compost waste, but odor-management and moisture-evaporation features are reduced until power is restored. Manual venting is possible if needed.
Is everything needed for installation included?
Yes, the package contains the toilet unit, vent kit, electrical kit, peat moss, hardware, manual, and warranty support.
Is customer support available?
Yes, purchase includes lifetime support from Sun-Mar experts and ShopTinyHouses.com's experienced team.
This product is typically shipped within 7-10 business days..
You can see our shipping and returns policy by clicking here.
Price Guarantee
We care about our customers and want to offer the best prices available for our top notch products. We have a close working relationship with all of our vendors and as such, we get to offer the most competitive prices in the market. However, if you find a company that is offering a lower price within 5 days of your purchase date, please let us know! We will gladly refund you the difference.
Simply e-mail us a link of the same product you've found at the lower price within 5 days of your purchase and we'll process the partial refund right away.
Conditions of our 100% Price Match Guarantee:
- The item must be purchased from us before we can match it
- The item must display the "Price Match Guarantee" banner on the product page.
- Buy one, get one free offers and rebates are not eligible
- The item must be in stock on the competitors website
- The competitor must be an online store, not a retail location
- The website can't be a discounter or auction website ( such as eBay, overstock, Amazon, etc.)
- The company must be an Authorized Retailer of the product in question
- The Price Match Guarantee includes the total item price (including shipping and tax).
If you have any questions please don't hesitate to contact us. As always, we're happy to hear from you!
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I have owned this for over 6 years and can't believe how easy it is to use, clean and maintain.