November 3, 2025
Port Hadlock, WA Water Heater Leak? Top Leak Plumbing Tips
Estimated Read Time: 12 minutes
A water heater leaking from the top can look minor, but it warns of a real issue. If your water heater is leaking from the top, act fast to protect your home and hot water supply. In this guide, CM Heating explains simple safety steps, common causes, and the smartest repair and replacement options for homes across Everett, Lynnwood, Bothell, and nearby communities.
First Things First: Make It Safe and Stop the Water
When you see water near the top of the tank, move quickly and safely.
- Cut power to the unit.
- Electric: Turn off the breaker labeled “water heater.”
- Gas: Turn the gas control to the Off position.
- Shut off the cold-water supply. The cold inlet valve is on the top of most units. Turn it clockwise until it stops.
- Wipe up visible water. This prevents slips and protects nearby flooring and drywall.
- Do not remove panels if you are unsure. Water and live power do not mix.
- If water continues to flow or you smell gas, leave the area and call for emergency service.
These steps buy time and reduce damage while you decide on repair or replacement.
Why Top Leaks Happen: The Most Common Sources
A water heater leaking from the top usually points to one of a few parts. Knowing which part is wet helps you describe the problem.
- Cold-water inlet or hot-water outlet fittings. Compression fittings or unions can loosen or corrode. Small drips turn into steady leaks under pressure.
- Temperature and Pressure (T&P) relief valve connection. If the pipe threaded into the T&P valve is loose or corroded, water may escape at the top before it runs down the discharge tube.
- Anode rod port. The anode rod screws into the top of the tank. A damaged gasket or loose cap can seep.
- Dielectric nipples. These protect against galvanic corrosion at the top connections. When they fail, you get rust and leaks.
- Internal tank corrosion. If rust has reached the top dome, seepage can appear at fittings. This is common on older tanks.
Tip: Rust stains, popping noises, temperature swings, or running out of hot water fast are classic signs your system is near the end. Most standard tanks last about 8 to 12 years under normal use.
Quick Tests You Can Do Before You Call
If you feel comfortable, try these simple checks. If not, skip to scheduling service.
- Dry the top of the tank and fittings with a towel.
- Wrap a tissue around each connection one at a time.
- Turn the cold-water supply back on slowly.
- Watch for damp tissue within 60 seconds at each point. This can reveal the source.
Stop if you see active spraying or a rapid leak. Do not overtighten metal fittings. That can crack nipples or valves and make the repair harder.
Repair vs Replacement: How to Decide
Not every water heater leaking from the top needs replacement. Here is a simple decision guide.
Choose repair when:
- The tank is under 8 years old and well maintained.
- The leak is from a fitting, nipple, or valve thread, not the tank shell.
- There is no heavy rust on the top dome or around the nipples.
Consider replacement when:
- The unit is 8 to 12 years old or older.
- You see widespread rust or corrosion at the top.
- The leak returns after tightening or gasket replacement.
- You also notice fluctuating temperatures, rumbling sounds, or frequent resets.
CM Heating provides both fast repairs and same-day replacements when stock allows. We also offer financing options through our Reliance network for budget flexibility.
Common Fixes We Perform and What They Involve
- Replace dielectric nipples. Prevents galvanic corrosion at the top connections and restores a tight seal.
- Reseat or replace the T&P relief valve and connection. Ensures safe pressure control and stops thread leaks.
- Replace flex connectors and shutoff valve. Modern stainless connectors and a quality ball valve improve reliability and serviceability.
- Anode rod service. Reseal a weeping anode port or upgrade the rod to extend tank life.
- Tank replacement. If corrosion is present, a new tank or a tankless system is a safer investment.
Because we pair water-heater work with full-service plumbing, we can also correct related issues like weak shutoff valves, aging CPVC, or upstream leaks with advanced leak detection equipment.
Local Code and Safety Notes Washington Homeowners Should Know
- Seismic strapping. Many Washington homes must have water heaters braced to resist earthquakes. Proper strapping at the upper and lower thirds is a safety requirement and an insurance concern.
- T&P discharge piping. The relief valve must discharge to a safe location with correct pipe size and material. Do not cap this line.
- Expansion control. In homes with closed systems, a thermal expansion tank may be required to protect pipes and fixtures.
CM Heating technicians follow code and manufacturer standards on every job. Customers often mention we improve earthquake proofing and clean the workspace before we leave.
What If You Have a Tankless Water Heater Leaking From the Top
Tankless units can also drip at the top, often from:
- Cold-water and hot-water isolation valve unions
- Heat exchanger connections
- Pressure relief valve threads
Shut off power and water as noted above. Leaks at o-rings or unions can be repaired, but signs of internal heat exchanger failure may point to replacement. Our team installs and services tankless systems across Everett, Lynnwood, and Bothell.
Preventing Future Top Leaks: Maintenance That Pays Off
A little care keeps fittings tight and corrosion at bay.
- Annual inspection. A quick top-side check catches weeping threads or corroding nipples early.
- Anode rod checks every 2 to 3 years. Replacing a spent anode protects the tank top and fittings from corrosion.
- Flush sediment yearly. Reduces heat stress and noise that can loosen fittings.
- Test the T&P valve. Ensures safe operation and can reveal weak connections.
- Upgrade aging piping. Replacing brittle CPVC or old galvanized near the heater lowers leak risk.
Many CM Heating customers choose our maintenance club for affordable annual service and other perks. It is a simple way to extend life and keep warranty coverage in good standing.
When It Is an Emergency and When You Can Wait
Call for emergency service when:
- Water is actively spraying or pooling near electrical equipment.
- You smell gas or see scorch marks.
- The T&P valve is discharging hot water and will not stop.
You can usually schedule a standard visit when:
- The leak is a slow drip at a fitting.
- You have already shut off water and power and the area is dry.
CM Heating provides 24-hour emergency availability. Our dispatcher will help you decide the right response.
Replacement Options: Standard Tank vs Tankless
If replacement is the smart move, we help you choose the best fit.
Standard tank advantages:
- Lower upfront cost
- Simple installation
- Works well for most families
Tankless advantages:
- Endless hot water
- Space saving design
- Higher efficiency and potential utility savings
We install energy-efficient solutions from top brands and back them with unbeatable warranties and our 100% satisfaction guarantee. After our Reliance partnership, you have access to a broader product selection and more financing options to fit your budget.
The CM Heating Process From Call to Hot Water
- Phone consult and photo review. We often identify a likely source before arrival.
- On-time arrival and clear pricing. We explain options before any work begins.
- Code-compliant repair or replacement. Proper strapping, venting, and leak checks.
- Education and cleanup. We show you how to use valves, check the anode, and flush.
- Follow-up. We confirm performance and schedule maintenance if you like.
This approach is why local homeowners trust us with urgent water heater issues. Fast, friendly, and thorough is our standard on every visit.
Signs It Is Time To Proactively Replace
Waiting for a failure can cost more. Consider a planned replacement if you notice:
- Age 8 to 12 years
- Rusty hot water at taps
- Rumbling or popping sounds from the tank
- Temperature swings or running out of hot water quickly
- Visible corrosion on the tank top or pipe nipples
Replacing a tired system prevents damage from surprise leaks and improves efficiency.
Local Insight: Why Top Leaks Show Up More in Our Area
Puget Sound winters and cool spring mornings drive heavy hot water demand. Repeated heating cycles stress fittings at the top of the tank. Homes around Everett, Lynnwood, and Bothell often have older shutoff valves and legacy piping near the heater. Upgrading these parts during service helps prevent new leaks and future callbacks.
Cost Expectations and Warranty Clarity
- Small top-side repairs often fall in a modest range depending on parts and access.
- Full replacements vary by tank size, venting, and code upgrades like seismic strapping and expansion control.
- Manufacturer warranties cover the tank and parts for a set term. Labor coverage depends on your plan and unit.
We provide transparent pricing and discuss warranty terms before work begins. Our goal is best value and no surprises.
Simple Homeowner Checklist When You Spot a Top Leak
- Turn off power and gas to the heater.
- Close the cold-water valve on top of the unit.
- Mop up water and clear the area.
- Note the model and age if visible.
- Call CM Heating to schedule repair or replacement.
Bring this list to the phone. It speeds diagnosis and helps us arrive prepared.
Why Homeowners Choose CM Heating for Top Leaks
- 24-hour emergency availability
- EPA-certified, continuously trained technicians
- Advanced leak detection tools
- Energy-efficient options and broad product access
- Financing choices to fit most budgets
- 100% satisfaction guarantee and strong warranties
We combine plumbing expertise with award-winning service. In 2024 we received the Gold Stevie Award for Company of the Year in Consumer Services. That standard shows in every water heater repair we perform.
What Homeowners Are Saying
"Excellent experience with Nathan and Wade from the plumbing division. Nobody wants their hot water tank to burst, but these guys did an excellent job, taking care of us and ensuring it was done quickly, efficiently, and correctly! They prevented more damage to our home with their efficiency and advocacy. Very grateful! I highly recommend them!!!" –Nicole C., Water Heater Emergency
"CM heating came out to my house to bid a replacement hot water heater. Matt the technician plumber arrived on time and provided me the best price, ordered a replacement hot water heater and installed with incredible professionalism, attention to detail and was able to answer all of my questions." –Shannon S., Water Heater Replacement
"Daniel did a professional job of replacing our water heater with a tankless heater. He was knowledgeable and courteous. I would highly recommend him to anyone. Thumbs up!" –Andy H., Tankless Installation
"When our hot water heater went out, CM Heating responded quickly and kindly. Top notch communication, availability, service, and honesty. I would recommend CM heating to anyone!" –Erica K., Water Heater Repair
Frequently Asked Questions
Why is my water heater leaking from the top?
Top leaks often come from loose inlet or outlet fittings, a weeping T&P valve connection, bad dielectric nipples, or an anode rod port gasket. Older tanks may also seep at the top due to corrosion.
Can I still use hot water if the top is leaking?
It is not wise. Shut off power and the cold-water supply immediately. Using the heater under pressure can turn a small leak into major damage or create a safety risk.
How much does a repair usually cost?
Costs depend on parts and access. Replacing nipples or resealing a T&P connection is often modest. If the tank is corroded, replacement is the cost-effective choice long term.
Should I replace if my heater is 10 years old and leaking from the top?
Often yes. The typical lifespan is 8 to 12 years. A top leak at 10 years usually points to corrosion. Replacing avoids repeat repairs and improves efficiency and safety.
What can I do to prevent future top leaks?
Schedule annual inspections, flush sediment, check the anode rod every 2 to 3 years, and upgrade old connectors and shutoff valves. Consider a maintenance plan for reminders and savings.
Conclusion
A water heater leaking from the top is a clear warning. Act fast, shut it down, and call a trusted local pro. CM Heating offers code-compliant repairs, same-day replacements, and tankless upgrades across Snohomish County. If your water heater is leaking from the top in Everett or nearby, we are ready to help.
Call or Schedule Now
Need help today? Call CM Heating at (425) 259-0550 or visit https://cmheating.com/ to schedule. Ask about financing and our maintenance club to keep your system protected year round.
Call (425) 259-0550 or schedule at https://cmheating.com/ for fast water heater service in Everett, Lynnwood, Bothell, and nearby. Same-day options, financing, and a 100% satisfaction guarantee.
About CM Heating
CM Heating has served Snohomish County for over 35 years with award-winning HVAC and plumbing service. We are EPA certified, offer 24-hour emergency response, financing options, and a 100% satisfaction guarantee. Our team installs energy-efficient solutions from top brands and stands behind our craftsmanship and warranties. In 2024 we earned the Gold Stevie Award for Company of the Year in Consumer Services. Local, transparent, and trusted.