The cheapest years of tank life you can buy
Water Heater Maintenance & Flushing in Denver, CO
One hour a year, roughly the cost of a tank of gas, and a water heater that reaches twelve instead of eight.
- Full sediment flush
- Anode rod inspected and measured
- T&P valve tested
- Annual maintenance plans available
Almost every water heater we condemn early failed for a reason that an annual service would have caught. Sediment insulating the burner. An anode rod consumed three years ago. A T&P valve seized shut. Water pressure running at 95 psi against a vessel rated for far less. None of these announce themselves — the heater keeps making hot water right up until it does not.
Maintenance is unglamorous and it is the highest-return plumbing spend in the house.
What an annual service includes
Full sediment flush
Not a two-minute bucket drain. We drain under pressure, agitate the tank floor and repeat until the discharge runs clear.
Anode rod inspection
Pulled, measured and photographed. When the steel core wire is exposed along most of its length, it is replaced — that is the difference between a tank at eight years and a tank at thirteen.
T&P valve test
Lifted, verified for free discharge and reseat, and checked for a correctly sized discharge line terminating within six inches of the floor.
Water pressure reading
Gauged at a hose bibb. Above 80 psi we recommend a pressure-reducing valve — high pressure shortens the life of everything downstream.
Expansion tank check
Air charge tested against your static pressure. A waterlogged expansion tank is doing nothing, and most fail unnoticed at around five years.
Gas: burner, FVIR screen, draft
Burner and pilot cleaned, intake screen vacuumed, flue inspected and draft smoke-tested under worst-case conditions.
Electric: elements and connections
Element resistance tested, thermostat calibration checked, terminal connections tightened.
Temperature set
120°F at the tank — hot enough to be safe from bacterial growth, cool enough to avoid scald injury and reduce standby loss.
Why sediment matters so much
Minerals precipitate out of water as it heats and settle on the tank floor. On a gas heater, that layer sits directly between the burner flame and the water, so the burner has to run longer and the steel above it overheats — which cracks the glass lining and exposes bare steel to corrosion. On an electric heater the sediment buries the lower element until it cooks itself.
The audible sign is the popping and rumbling people describe as the heater "boiling." That is water flashing to steam trapped beneath the deposit layer. Caught in year three it flushes out easily. Caught in year eight, the deposits have hardened into a crust that a flush cannot remove.
Denver Water's snowmelt-based supply is relatively soft, which helps. But sediment also includes sand and pipe scale from the distribution system, and homes in the south and east metro drawing Denver Basin groundwater deal with genuinely hard water and build deposits considerably faster. If you have scale on your shower glass, your water heater is collecting the same material.
Maintenance schedule
| Task | How often | Why |
|---|---|---|
| Full flush | Annually (twice yearly on hard water) | Removes sediment before it hardens |
| Anode rod inspection | Every 2–3 years, annually after year 6 | The sacrificial rod is what protects the steel tank |
| T&P valve test | Annually | A seized relief valve is a safety failure |
| Expansion tank charge | Annually | Waterlogged tanks fail silently |
| Water pressure check | Annually | Above 80 psi damages the whole system |
| Tankless descale | Annually | Protects the heat exchanger and the warranty |
| Burner and FVIR screen | Annually on gas | Prevents combustion problems and CO risk |
Can you flush it yourself?
You can, and if you are handy it is worth doing. Shut off the gas or breaker, close the cold supply, run a hose from the drain valve to a floor drain or outside, open a hot tap upstairs to break the vacuum, and drain. Then briefly reopen the cold supply a few times to stir the floor before draining again.
Two cautions. First, on a tank that has never been flushed, sediment can lodge in the drain valve and prevent it from closing — you then have a permanently running tank at 9 p.m. Second, a DIY flush does nothing for the anode rod, which is the component that actually determines how long the tank lives. If your heater is over six years old and has never been serviced, have the first one done professionally.
Frequently asked questions
How often should a water heater be flushed in Denver?
Once a year for homes on Denver Water's municipal supply. Twice a year if you are on harder south-metro groundwater or you can already hear popping from the tank.
How much does a water heater flush cost?
A standalone flush typically runs $140–$250 in the Denver metro. A full annual service — flush, anode inspection, T&P test, pressure check and combustion or element testing — runs more, and is the version that actually extends tank life.
Will flushing an old water heater cause it to leak?
It is a real concern on a neglected tank past ten years — sediment can be partly holding back a corroded drain valve, and disturbing it occasionally reveals a leak that was already there. We assess the tank's condition before flushing and tell you the risk before starting.
What is an anode rod and why does it matter?
It is a sacrificial magnesium or aluminum rod that corrodes instead of your tank's steel. Once it is consumed, corrosion moves to the tank wall and the clock starts. Replacing a rod costs a fraction of a new heater and is the single most effective life-extending service there is. See anode rod replacement.
What temperature should I set my water heater to?
120°F is the standard recommendation — hot enough to limit bacterial growth, low enough to reduce scald risk and standby losses. Households with immune-compromised members sometimes run 130°F with anti-scald mixing valves at fixtures.
Do you offer a maintenance plan?
Yes. Our annual plan covers the full service visit, priority scheduling, and a discount on any repairs found during the visit. Tankless customers get an annual descale on the same plan.
Cold shower this morning? We can be out today.
Tell us what the heater is doing and we will give you a straight answer on the phone — repair, replace, or wait.