Why Is My AO Smith Water Heater Not Heating?
- Hot Water Pros

- Jun 7
- 3 min read
Few household problems are more frustrating than running out of hot water halfway through a shower.
If your hot water supply seems shorter than it used to be, several issues may be responsible. Some problems can be repaired, while others may indicate that it's time to replace the water heater.
Hot Water Pros provides professional water heater diagnostics, repair, and replacement throughout Indianapolis and surrounding communities.
Why Am I Running Out Of Hot Water?
Several issues can reduce the amount of hot water available in your home.
Common causes include:
Failing heating elements
Thermostat problems
Sediment buildup
Aging water heaters
Broken dip tubes
Increased household demand
Undersized water heaters
Tankless maintenance issues
Proper diagnosis is important because multiple problems can produce similar symptoms.
Failed Heating Elements
Electric water heaters typically use two heating elements.
If one element fails, the water heater may still produce some hot water, but often not enough to meet normal household demand.
Common symptoms include:
Short showers
Lukewarm water
Long recovery times
Higher utility bills
Sediment Buildup Inside The Tank
Over time, minerals settle at the bottom of the water heater.
Heavy sediment buildup may:
Reduce available hot water
Increase heating times
Lower efficiency
Cause popping or rumbling noises
This is especially common in areas with hard water.
Thermostat Problems
A malfunctioning thermostat may prevent the water heater from heating water to the proper temperature.
Common signs include:
Inconsistent temperatures
Water not hot enough
Running out of hot water quickly
Frequent reset button trips
Broken Dip Tube
The dip tube directs incoming cold water to the bottom of the tank.
If it breaks, cold water may mix with hot water near the top of the tank.
This often results in:
Reduced hot water supply
Inconsistent temperatures
Short shower times
Increased Household Demand
Sometimes the water heater is working properly but demand has increased.
Common examples include:
Additional family members
New bathrooms
Larger soaking tubs
Multiple simultaneous showers
Increased appliance usage
In some situations, upgrading the water heater may be the best solution.
Is My Water Heater Too Small?
Possibly.
Many homes have water heaters that were sized for previous occupants.
If your household has grown, your existing water heater may no longer meet demand.
A larger tank or tankless water heater may provide a better long-term solution.
When Should I Replace My Water Heater?
Replacement may be recommended if:
The tank is leaking
Repairs are becoming frequent
The unit is nearing the end of its lifespan
Hot water demand has outgrown the current system
Current Water Heater Replacement Pricing
Electric Water Heaters
40 Gallon Electric Water Heater – $1,599 Installed
50 Gallon Electric Water Heater – $1,599 Installed
Gas Water Heaters
40 Gallon Gas Water Heater – $1,849 Installed
50 Gallon Gas Water Heater – $1,849 Installed
Tankless Water Heaters
Navien NPE-240A2 Replacement – Starting at $4,299 Installed
Why Indianapolis Homeowners Choose Hot Water Pros
Hot Water Pros specializes in water heater diagnostics, repair, maintenance, and replacement.
We provide:
Water heater repair
Water heater replacement
Tankless water heater service
Water heater flushing
Water pressure testing
Upfront pricing
We proudly serve Indianapolis, Carmel, Fishers, Westfield, Noblesville, Greenwood, Brownsburg, Whitestown, and Zionsville.
Need More Hot Water?
If you're constantly running out of hot water, Hot Water Pros can identify the cause and recommend the most cost-effective solution.
Call 317-922-9043 today to schedule service.


Comments