Water heaters
A symptom record and scope checklist for tankless error codes, low flow, delayed hot water, tank leaks, no hot water, and replacement decisions.
Treat gas odor, combustion concerns, active flooding, and water near electrical equipment as safety issues. For a tankless unit, record the displayed code, which fixtures are affected, flow changes, power interruptions, and maintenance history. For a storage tank, record the exact leak location, recovery pattern, noise, temperature, and visible corrosion before comparing repair with replacement.
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Ask what test isolated the fault and what evidence supports the recommendation. A symptom alone does not identify every underlying cause.
Confirm labor, materials, model numbers, permits, access, disposal, cleanup, startup, and any walls, floors, landscaping, or finishes that another trade must restore.
Request invoices, warranty terms, permit or inspection records when applicable, equipment settings, test results, and clear instructions for operation and maintenance.
Service-specific scope
The proposal should identify whether the problem involves flow sensing, scale, controls, ignition, fuel or power, venting, the heat exchanger, storage tank, element, burner, valves, connections, drainage, or capacity. A replacement scope should name the selected capacity, incoming-water and peak-flow assumptions for tankless equipment, fuel or electrical changes, venting, pan and drain, expansion control, permits, disposal, startup, and warranty.
Prepare the service call
The useful first record identifies the equipment, fixture pattern, safety conditions, and maintenance history before a repair or replacement scope is compared.
Common questions
A fitting, valve, drain, or connection may have a different repair path from a leaking tank. Shut off the water and power or fuel only when you can do so safely, then ask the provider to identify the exact leak location.
A tankless heater must sense enough flow before it starts. Record the fixture, hot-water flow, aerator or low-flow condition, displayed code, and whether another fixture changes the result. Do not bypass a safety control or change hidden settings without the manufacturer procedure.
The combined demand and required temperature rise may exceed the unit's capacity. Record which fixtures were running and whether the temperature changed only during simultaneous use so a provider can compare the pattern with the model's rated flow.
The scope should cover capacity, fuel or electrical supply, venting, drain pan and drain route, expansion control, permits, disposal, startup, and warranty. Tankless work also needs incoming-water temperature, peak-flow, service, and maintenance assumptions.
Treat gas odor, combustion concerns, active flooding, water near electrical equipment, or signs of fire as safety issues. Leave unsafe areas and contact the appropriate emergency authority, utility, or qualified professional.
Related decisions
Verify before hiring
Federal guidance on tankless flow sensing, sizing, temperature rise, pipe layout, water quality, scale, maintenance, utilities, and installation tradeoffs.
Federal buying guidance on peak flow, product capacity, replacement planning, and certified whole-home gas tankless equipment.
Federal guidance for finding and addressing household water leaks.
Official state certification, business-registration, and consumer information for plumbing and gas-fitting work.
Utility-location guidance before digging or excavation.
State consumer guidance on licensing, references, insurance, contracts, and payments.