Pennco Keystone KWC Series

The Pennco Keystone KWC Series features a dependable cast iron heat exchanger with cast iron push nipples.  The sections and push nipples expand at the same rate when heated.  By using similar materials instead of less expensive gaskets, the boiler maintains a water tight seal. 

In the Less Coil version, the control monitors water temperature and delays the burner starting until any residual heat has been transferred. Thermal purge logic measures rate of temperature change inside the boiler and delays burner firing accordingly. This maximizes efficiency by turning on the burner only when needed.

In the With Coil version the Low Limit Control seeks maximum temperature to satisfy domestic hot water call bypassing thermal purge logic.