Ask the installer to leave you with usable information
We recommend collecting the model and serial number, owner's manual, installation invoice, startup record, warranty terms, and registration confirmation where applicable. Confirm any registration requirement and deadline from the actual terms. Do not assume every brand or product uses the same deadline or that registration includes labor coverage.
Have the installer show you the filter location, approved replacement, direction, and safe owner access. Learn the thermostat's basic settings and where normal status information can be seen. Ask which observations warrant a service call and whom to contact about an installation concern.
Keep owner care separate from service work
Follow the manual for accessible filter care. Keep a dated record of changes and professional visits. Note unusual cycling, new noises, poor heating, or visible water where it was not expected, and report those observations without opening the unit or trying internal adjustments.
Arrange the professional maintenance required for the model and household use. Ask for a report of findings and any recommended correction. A maintenance visit should leave a useful record, rather than only a sticker showing someone attended.
Do not clean burners or sensors, adjust gas settings, test protective switches, or open combustion components as routine owner care. New equipment does not make those jobs safer for an untrained owner.
Your next action is to request the owner orientation and complete the equipment record. Then set reminders for the specified filter and professional care. This supports informed upkeep without promising that maintenance will prevent every failure or guarantee a particular lifespan.