Last updated: 2026-05-01
🚿
Water Heater No Hot Water
Water runs cold or only lukewarm from all taps
90%
90% chance this is caused by:
Failed thermocouple (gas) or tripped breaker/element (electric)
🔧 The Exact Part You Need
Total parts cost: $32. Same-day shipping available on most items.
🔨 Tools You'll Need
Easy · 20-30 minutes
Parts: $32 vs $$500-2,000 to replace
📋 Step-by-Step Instructions
1
For gas: check if pilot light is on — if not, try relighting
2
If pilot won't stay lit, the thermocouple is bad
3
Turn gas valve to off, remove old thermocouple, install new one
4
For electric: check breaker first
5
If breaker is fine, test heating elements with multimeter
6
Replace the element with no continuity
Other Water Heater Problems
Frequently Asked Questions
How much does it cost to fix a water heater that's no hot water?
The part costs about $12. If you do it yourself, that's your total cost. A professional service call would add $100-200 in labor, bringing the total to $162.
How long does this water heater repair take?
This repair is rated "easy" and typically takes 20-30 minutes. The most time-consuming part is usually accessing the component, not the actual swap.
What if this isn't the problem?
Our diagnosis is 90% likely based on the symptom you described. If replacing this part doesn't fix it, the next most common cause for "water runs cold or only lukewarm from all taps" would be related to the wiring harness or control board. In that case, consider calling a professional.
Should I just replace my water heater instead?
A new water heater costs $500-2,000. If yours is well under 8-12 years old, a $12 repair is far more cost-effective. If it's near end-of-life and has had multiple issues, replacement starts making more sense.