The Hidden Dangers of Replacing a Water Heater Yourself

Frank Davis
Jun 23
2 min read

Updated: 3 days ago

Water heater replacement Tulsa, Call Karney Plumbing

If your water heater is on its last leg, you might be tempted to handle the replacement yourself to save time or money. But before you break out the wrench and head to the hardware store, it’s important to know: replacing a water heater is not a simple DIY job. In fact, it can be dangerous—and in some cases, even illegal—if done improperly.

At Karney Plumbing, we’ve seen firsthand the costly and sometimes hazardous mistakes homeowners make when attempting to install a new water heater on their own. Here’s why it’s always best to leave this critical job to the pros.

1. Gas Leaks and Fire Hazards

If your water heater runs on natural gas, one small mistake during installation could lead to a gas leak. Gas leaks are incredibly dangerous, creating risks of fire, explosion, and carbon monoxide poisoning. Certified plumbers know how to handle gas lines safely and ensure all connections are properly sealed and tested.

2. Carbon Monoxide Poisoning

Improperly vented gas water heaters can cause carbon monoxide to build up inside your home. This odorless, colorless gas is deadly—and a common result of incorrect DIY installations. Professionals ensure that the venting is secure, unobstructed, and up to code.

3. Electrical Hazards

Electric water heaters require wiring that complies with strict electrical codes. If you’re not familiar with electrical work, you risk electrocution, short circuits, or even a house fire. Licensed plumbers or plumbing-electric hybrid professionals can safely handle the wiring and ensure your unit is grounded and functioning correctly.

4. Improper Pressure Relief Valve Installation

The temperature and pressure relief (T&P) valve is a critical safety feature that prevents your water heater from exploding due to excessive pressure. If installed incorrectly or omitted, the results can be catastrophic. This isn’t an exaggeration—there have been real incidents of water heaters launching like rockets due to improper pressure handling.

5. Voiding the Manufacturer’s Warranty

Most water heater manufacturers require professional installation for the warranty to remain valid. A DIY installation could leave you without coverage if something goes wrong, potentially costing you hundreds—or thousands—more in the long run.

6. Local Building Code Violations

Tulsa and most municipalities require water heater replacements to meet plumbing codes and, in some cases, to be permitted and inspected. If your DIY project doesn't meet code, you could face fines or be forced to redo the work correctly.