Boiler Maintenance Service- Performed a heating system preventative maintenance service on a gas boiler. Isolated the boiler and cleaned the strainers and traps. Removed and cleaned the air filter. Started and checked the safeties. Performed a combustion test. System is operating properly. Purged the zones by utilizing the garden hose from outside to fill the system. Recommend installing an automatic water feed to help fill and purge the system.