Before winter, check any tank or tankless unit for leaks, corrosion, unstable temperature, unusual noise, venting problems, or error codes. Maintenance depends heavily on type and fuel — gas, propane, electrical, and pressure-relief work belongs to qualified professionals.
Visual checks anyone can do
Look for water at the base, moisture at connections, rust streaks, damaged venting, disconnected discharge piping, soot near fuel-fired equipment, or a wet drain pan. Keep the service area clear of flammables and anything blocking combustion air. A leaking storage tank generally needs prompt evaluation — don’t wait on it.
Sediment, scale, and the relief valve
Popping or rumbling in a tank often means sediment settling beneath the burner or elements; flushing frequency depends on water quality and the manufacturer, and a homeowner who isn’t confident should use a professional (risks include scalding water, a stuck drain valve, or flooding from a hose failure). The temperature-and-pressure relief valve is a safety component — never cap, plug, or route it improperly, and have a professional evaluate it if its condition is uncertain.
Tankless-specific care
Tankless units need periodic inlet-screen cleaning, descaling (frequency depends on hardness and use), venting and combustion checks, condensate maintenance, and a review of error history. Freeze protection usually depends on power and fuel staying available — it’s not a guarantee during an outage or long vacancy.
Cabins and seasonal units
Decide before winter whether the unit stays active or gets drained. If draining a tank: shut off energy first, let it cool, follow the manufacturer’s steps, and prevent accidental energizing while empty. On reopening, inspect first, restore water gradually, fill a tank completely before restoring power (never energize an empty electric tank), and watch the first heating cycle. Full reopening steps are in our cabin reopening checklist.
When maintenance isn’t enough
Consider replacement when a storage tank is actively leaking, corrosion is advanced, failures repeat, parts are unavailable, or repair cost is high relative to the unit’s condition. Age is a useful data point, but shouldn’t be the only factor in the decision.
Quick answers
How often should I flush a tank? Follow the manufacturer and adjust for observed sediment — there’s no universal interval.
Is a leaking water heater an emergency? An actively leaking tank can cause real damage — address it promptly, and shut off water/energy only if you’re sure it’s safe to do so.
Does a tankless unit need annual descaling? Depends on hardness, usage, and the manufacturer — test the water and follow their guidance.