The pilot will in turn ignite the burner. Electronic spark ignition improves the AFUE of a boiler by eliminating the consistently burning pilot flame. Vent Dampers - Boilers lose a considerable amount of heat up the flue. An automatic vent damper will prevent heat from escaping up the chimney when the main burner is off. The time needed to reach this point is reduced as a result of the vent damper.
Vent dampers can also help to retain humidity in the building by reducing infiltration.
This is accomplished through the addition of a secondary condensing heat exchanger. So much heat is extracted that the water vapor in the gases condenses, giving them the name condensing boilers. The exhaust gases from these type of boilers have lower temperatures and can be vented horizontally, eliminating the need for a chimney. How to Proceed Contact your heating service company to do a thorough evaluation for you. They should be able to estimate how poorly your existing boiler is performing, its useful life, and whether replacing it with a new, properly sized, high efficiency unit makes sense.