Most water heater failures give some warning: a little rust at a fitting, a louder rumble, a slower recovery. A few minutes of looking each month is usually enough to catch them. The heavier tasks, like flushing a tank or descaling a tankless unit, follow the schedule in your heater's manual, which in hard water usually means staying at the more frequent end of what it recommends.
Copy the calendar, add the dates that suit your household, and keep it with the shutoff map near the heater.
Through the year
- Every month
- Look at the base, fittings and relief pipe for moisture or rust. Listen for new noises. Keep the area around a gas heater clear.
- Every season
- Check the temperature at a hot tap. Look at the vent connection on gas units. Test carbon monoxide alarms.
- Twice a year
- Check that seismic straps are snug and connections are flexible. Clean faucet aerators that collect grit.
- Yearly or per manual
- Flush a sound tank or descale a tankless unit. Ask about the anode rod and relief valve at a service visit.
- When the heater ages
- Start collecting replacement quotes before it fails, so you are not choosing in an emergency.
Tank or tankless tasks
| Task | Tank | Tankless |
|---|---|---|
| Visual leak check | Monthly | Monthly |
| Sediment flush | Per manual; hard water favors more often | Not applicable |
| Descaling the heat exchanger | Not applicable | Per manual; hard water favors more often |
| Inlet filter cleaning | Not applicable | Per manual |
| Anode rod check | At service visits | Not applicable on most units |
| Seismic strap check | Twice a year | Check wall mounting is secure |
Monthly two-minute look
- Floor around the heater is dry
- No rust or white crust at the top fittings
- Relief pipe outlet is dry
- No scorch marks around the burner opening
- Nothing flammable stored nearby
- No new popping, rumbling or whistling
Ask at a yearly service
- How much sediment or scale came out?
- What condition is the anode rod in?
- Is the relief valve working and the discharge pipe routed safely?
- Does anything about the venting or gas connection need attention?
Common questions
- Is yearly flushing enough in Fullerton?
- Follow your heater's manual. With hard water, many households stay at the more frequent end of its guidance.
- Can I skip maintenance on a new heater?
- Sediment and scale start building from the first day. Regular looks and scheduled flushing protect the new unit.
- What temperature should I set?
- Many households use around 120°F to balance comfort and scald risk. Check your manual and household needs.
General information for Fullerton, not a quote or professional advice. In an emergency, call 911.