Maintenance is the least dramatic water heater service, and the one that catches the most problems early. In Holiday, where the water is generally hard, it comes down mostly to sediment and scale.
This page covers what a visit includes, what flushing does and does not do, and how to tell when a tank is past the point of being worth the effort. If your heater already has a problem, our page on a leaking water heater may be what you need first.
What water heater maintenance includes
A maintenance visit varies by heater type and by pro, so ask what yours covers. In general, it includes:
- Looking over the tank, fittings and surroundings for leaks, rust and corrosion.
- A water heater flush to clear sediment from the bottom of the tank.
- Checking the anode rod.
- Checking the temperature and pressure relief valve and, where one is fitted, the expansion tank.
- On gas units, a look at the burner and the vent. On electric units, a look at the elements and thermostats.
- A check of the temperature setting and a short chat about anything you have noticed.
A visit is a chance to catch small things. It is not a promise that nothing will go wrong later, and nobody honest will tell you otherwise.
Sediment in water heater tanks and hard-water scale
Tampa Bay area water is generally hard, and the minerals in it settle at the bottom of a tank as sediment. Over time that layer insulates the water from the burner or lower element, makes the heater work harder, causes rumbling and popping sounds and shortens the tank’s working life.
Sediment is easy to ignore because the heater keeps working while it builds. By the time the tank rumbles, the layer can be thick, and the water heater flush becomes harder to do well. A flush drains water from the bottom of the tank to carry loose sediment out. It helps most when it is done regularly, and less when the sediment has been left to harden for years. Flushing involves hot water, a drain valve and, on gas and electric units, the heater’s own controls, so it is a job for the pro and not for the homeowner.
Hearing rumbling from the tank? Describe it and ask what a flush would involve.
Schedule a flush with a local proThe anode rod: what it does and when it is checked
The anode rod is a metal rod that hangs inside the tank and corrodes in place of the tank’s steel lining. When it is used up, the tank itself starts to corrode. That is why the rod is checked during a service visit, and why anode rod replacement is a common part of a tank’s care.
Not every tank has an easy rod to reach, and some are too far gone for a new rod to matter. The tech tells you which case you are in rather than selling a part regardless.
Relief valve and expansion tank checks
The temperature and pressure relief valve is a safety device, and the technician checks it. Please don’t test it yourself, since opening it releases hot water. The same visit covers the expansion tank, where the home has one, to see that it is doing its job.
If either one is wearing out, the tech explains what it means and what it would take to replace it, with the price upfront.
Tankless descaling
Tankless units do not have a tank to flush, but they do have a heat exchanger, and scale builds inside it. A descaling flush pushes a mild cleaning solution through the unit via its service valves. How often depends on your water and your usage, so ask the pro for a sensible rhythm. Our page on a tankless water heater covers how these units work.
When maintenance is no longer worth it
Maintenance cannot rescue a tank that is already failing. If the tank is leaking, heavily corroded or crusted with sediment that will not move, money spent on flushing and rods is better put toward a new unit. The tech tells you honestly where yours stands.
If it is time for a new one, our page on water heater installation explains what happens next.