Some tankless installations have valves that let a technician isolate the heater and connect service hoses. They make certain maintenance tasks easier when the model calls for them. A missing or inaccessible valve can affect what work can be done during a visit.
Photograph the visible piping
Without turning the valves, take a photo of the piping below the heater and share the heater model. Tell the technician if the unit is in a tight cabinet or if a valve has leaked or been hard to operate.
Confirm the maintenance scope
Ask which parts the technician will service and what the manufacturer specifies for your unit. If a valve needs replacement, ask how long the water will be off and what leak checks will follow when the heater returns to service.
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