#89 Takagi. Specially designed for single-family homes, the T-K3-SP tankless water heater delivers efficiency in a compact design, but at a lower price point than previous models. With thermal efficiency of 80% for natural gas and liquid propane, and the ability to provide unlimited hot water up to 7 gpm, the T-K3-SP allows for multiple hot-water activities at once. The unit measures 13.8 inches wide, weighs 40 pounds, and can be mounted indoors or outdoors. 866.356.9190. www.takagi.com.

#91 Panasonic. The WhisperComfort spot energy recovery ventilator (ERV) is the first ceiling-insert ERV available in the U.S. Using two ducts, the fan exhausts stale air and brings in fresh air from outside. Its low-rate continuous run helps ensure that VOCs and other indoor air pollutants are vented out and replaced with fresh air. The fan’s capillary core adds heat and moisture to the incoming air to temper it and maintain a comfortable indoor living environment. 800.211.7262. www.panasonic.com/ventfans.