A boiler or tankless heater can appear to work normally while a service issue develops. The manufacturer’s maintenance schedule is the best starting point for deciding when it should be checked.
Know what the visit covers
A qualified technician may review visible connections, controls, venting, fault history and model-specific maintenance points. The exact work depends on the appliance. Ask what has been inspected and which items require follow-up rather than assuming every visit includes the same tasks.
Keep service records and note changes in heat, hot water, pressure, noise or error codes between visits. Those details can help distinguish a recurring fault from a new one.
Arrange the right specialist
Do not remove covers or change gas controls as a substitute for service. Our boiler and heating team and tankless water-heater team can discuss the equipment and its next scheduled check.
Keep a useful service record
Save the model number, installation date, manuals and invoices in one place. After each visit, ask which items were checked, what was cleaned or adjusted, and whether a follow-up is recommended. A clear record helps the next technician see whether an error code or loss of performance is new or recurring.
Natural Resources Canada recommends following the manufacturer’s maintenance procedures for heating equipment. A boiler and a tankless domestic water heater may serve different loads and have different maintenance points, even when both are wall mounted. If you’re unsure which system you have, photograph the rating label and describe whether the problem affects room heat, tap water or both.