Two types of boilers can be better than one – especially when trying to minimize operating costs over the course of a heating season. By combining a large mass, noncondensing boiler with a high-efficiency condensing boiler — or “hybrid system” — you will ensure that your heating system is running at optimum efficiency.
Noncondensing boilers are designed to run at higher return water temperatures above 130°F to maximize longevity. The average efficiencies of noncondensing boilers range from 80-85% thermal efficiency. High-temperature applications typically occur over the core heating season months of December through February.