Water Heater Inspection
& No Hot Water Diagnosis
Garland, TX
Thermostat and heating element testing on an electric water heater — root cause traced to a faulty shower cartridge mixing cold and hot water at the fixture.
Check-In Summary
A technician from Cowtown Water Heaters in Garland, Texas inspected an electric water heater after reports of no hot water. They tested both thermostats and heating elements, confirming they worked correctly. The issue was traced to a faulty shower cartridge that caused cold and hot water to mix, preventing hot water from reaching the fixtures.
Job Details
Equipment & Service Details
Unit Inspected
Service Type
Fuel Type
Service Area
Diagnostic Steps
Components Tested & Findings
Job Photography
Photos from This Service Call
Photos from the January 2026 electric water heater inspection in Garland, TX — completed by Cowtown Water Heaters.
Where We Worked
Service Location
Garland, TX
Dallas County
This water heater inspection was performed in Garland, Texas — part of the greater DFW Metroplex. Cowtown Water Heaters services Garland and surrounding Dallas County communities in addition to our home base of Fort Worth and Tarrant County.
Technical Detail
About This Inspection
Why Test the Thermostats and Elements First?
When a customer reports no hot water on an electric unit, the thermostats and heating elements are the first components tested — they are the most common failure points. Testing them early eliminates the water heater itself as the source of the problem before looking downstream at fixtures and plumbing.
What Does a Faulty Shower Cartridge Actually Do?
A shower cartridge controls how cold and hot water blend inside the valve body. When the cartridge fails or wears out, it can allow cold water to bleed into the hot side — or prevent the valve from reaching full hot. The result is lukewarm or cold water at the fixture even when the water heater is working perfectly.
How Do You Confirm the Water Heater Isn’t the Problem?
Continuity testing on both heating elements confirms whether they are drawing current correctly. A functioning element with a functioning thermostat means the heater is producing hot water — the issue is downstream. Confirming this before replacing any water heater components prevents unnecessary repairs.
Could This Problem Affect Other Fixtures in the Home?
A faulty cartridge is isolated to a single valve — it will only affect the fixture it controls. If multiple fixtures in the home had no hot water, that would point back toward the water heater, a shutoff valve, or a mixing valve on the supply line. A single-fixture complaint narrows the diagnosis considerably.
Your Technician
Who Performed This Service
Javier Reyes
Responsible Master Plumber
Lic# 44778 · Cowtown Water Heaters · Fort Worth, TX
From the Field
Job Notes
- ✦Both thermostats tested with continuity confirmed — upper and lower were setting temperature correctly and cycling as expected.
- ✦Both heating elements tested; resistance within manufacturer spec on both upper and lower — no element replacement needed.
- ✦With the water heater ruled out, diagnosis shifted to the fixture level. Hot water was present at the supply line but not reaching the shower outlet at usable temperature.
- ✦Shower cartridge identified as the root cause — a failed cartridge allows cold water to bypass the mixing position and dilute the hot supply, producing a no-hot-water symptom that mimics a water heater failure.
- ✦No water heater components were replaced; all existing equipment was functional at the time of inspection.
— Javier Reyes, Lic# 44778
Need a Water Heater Inspection in DFW?
Cowtown Water Heaters serves Fort Worth, Garland, and the entire DFW Metroplex — call us today.
