The Ultra boiler is available in two models: the Ultra 155 and the Ultra 230. The Ultra boiler features PhD (Precision Hydronic Data) technology, an intelligent system that delivers precision hydronic heating and hot water for needs while maximizing efficiency by measuring and responding to the data parameters of a heating system, the manufacturer states. The company says that the boilers can be used in floor-standing or wall-hung applications. The Ultra 230 features 92.8 percent AFUE and the Ultra 155 features 93.0 percent AFUE. The heat exchanger is designed to operate in low-temperature condensing applications. According to the company, the venturi technology constantly maintains optimal air and fuel ratios at all firing rates.
Weil-McLain, 500 Blaine St., Michigan City, IN 46360-2388; 219-879-6561; 219-877-0556 (fax); www.weil-mclain.com.