Hybrid Heating System Design

Choose both the most efficient and cost effective design for a dual loop heating system for the client:

A) 100% of load served by condensing boiler: Mothball 3 non-condensing boilers and install three 5,000 MBH condensing boilers

B) 40% of load served by condensing boiler, 60% non-condensing:  Add two boilers, one condensing for the heat pump hot water loop and one non-condensing for the radiation hot water loop

C) 100% of load served by non-condensing boiler: replace non-condensing boiler with right-sized boiler and modulating burner, re-use existing flue

Answer: B

SES provided the design to upgrade a central heating system serving 4 buildings comprising of 300+ heat pumps, radiation, and fresh air units.