The Logamax Plus GB142 is a Bosch Buderus gas condensing boiler that is 95 percent energy efficient. The GB142 is available in four models with heating capacities ranging from 75,000 to 199,000 BTU. Bosch has two other gas condensing boiler lines that are up to 93 percent efficient.
The Buderus Logamax Plus GB162 is up to 93 percent efficient and is designed for both standalone and cascade applications. The GB162 supports up to eight boilers in a cascade configuration. The Buderus Logano Plus GB312 is 92.5 percent efficient with a variable speed fan for lower power usage. A high output aluminum heat exchanger minimizes thermal loss and maximizes heating output. The GB312 is available in four models, ranging from 305,000 to 944,000 BTU.