Sanco2 Heat Pump Water Heater

Heat pumps are changing the way the world heats water. Every major manufacturer of water heaters has a “hybrid” product that marries an advanced heat pump with a conventional electric resistance element for back up. The Sanco2 is unique in several ways. It uses carbon-dioxide gas as the refrigerant instead of the typical chemicals that have a very high global warming potential. Instead of mounting the heat pump on top of the tank to make a single piece of equipment, it uses a split system approach that uses an outdoor unit. This means that the HPWH doesn’t reduce indoor temperatures or require a large amount of indoor space. Sanco2 is more energy efficient with a Uniform Energy Factor as high as 5 compared with other products with UEFs ranging from 2.5 to 4. It operates at very low outdoor temperatures and doesn’t require back up electric elements. In addition to heating water, the standard Sanco2 may have enough additional heating capacity to provide space heating through a hydronic heating system for some highly efficient homes in mild climates.. The product is made in Japan and available from several American distributors.   

Available from:

Small Planet Supply

Four Seven Five

Eco2 Water Heater

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Rheem Hybrid Electric Water Heaters

  • 3.50 - 3.70 UEF
  • Meets NEEA Tier 3 Requirements
  • Grid-Enabled for Utility-Level Performance Monitoring
High Efficiency
  • Meets ENERGY STAR® requirements
  • Increased property value for consumers
Easy Installation
  • Easily Ducted — for installation in smaller spaces with minimal make up air required
  • Easy access to side water connection and top electrical junction box; Zero to minimal clearance required in the back or side of the unit
  • 3/4" NPT water inlet & outlet; 3/4" condensate drain connections
  • Dry fire protection
Available EcoNet® Smart Technology
  • WiFi connected for mobile access
  • Energy usage reporting
  • Grid interactive for utility demand response / load management programs
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Bradford White AeroTherm

The Bradford White AeroTherm® Series water heaters combine the installation and servicing features valued by plumbing professionals with the energy and cost saving benefits important to today’s energy conscious consumer. Discuss this Product


Structural Insulated Panels (SIPs)

Please Note: The Zero Energy Project has not tested any of the products listed and lists them only as products builders may want to consider when evaluating various products to be used in their projects. The responsibility for evaluating them rests solely with the designer, builder or homeowner.