Electronic and electrical safety and protection apparatus sold separately but for use with residential and commercial heating units for heating water and/or making steam, namely, controllers, alarms, relays, temperature sensors, and temperature indicators to monitor and prevent boiler malfunction, boiler failure, boiler low temperature, boiler high temperature, circulator malfunction and power loss

Protection systems for heating apparatus, namely, controllers, alarms, relays, temperature sensors, and temperature indicators to monitor and prevent boiler malfunction, boiler failure, boiler low temperature, boiler high temperature, circulator malfunction and power loss, all of the foregoing sold as primary components of residential and commercial heating units for heating water and/or making steam