Water Heater Repair and Replacement in Walnut Creek, CA
No hot water, a leaking tank or a tankless unit flashing an error code? We handle water heater repair in Walnut Creek around the clock, plus water heater replacement with tank, tankless and hybrid heat pump models. We install recirculating pumps, expansion tanks, T&P valves and the earthquake strapping California law requires, and we service commercial heaters too. Estimates are free, including for water heater flushes, and seniors get a discount. Call and a real person answers, day or night.
- Open 24 hours, including holidays
- Licensed and insured since 1993
- Written price before any work starts
- Senior discount available
Water heater repair and replacement in Walnut Creek
We repair, flush and replace every common type of water heater in Walnut Creek homes and businesses: gas and electric tank heaters, tankless units, hybrid heat pump models and commercial heaters. We also add recirculating pumps, earthquake strapping, expansion tanks and new temperature and pressure relief valves.
Most calls start the same way. The shower went cold, there is water on the garage floor, or the heater is making a sound it never made before. The right answer might be a part, a flush or a new heater. We tell you which, and why, before any work starts.
Tank-type heaters
The familiar gas or electric tank in the garage or closet. We repair burners, thermocouples, gas valves, elements and thermostats, and replace tanks that are leaking or worn out.
Tankless water heaters
On-demand units that heat water as it flows. We handle tankless water heater repair, error codes, descaling and new installs, including the gas line and venting changes they often need.
Hybrid heat pump heaters
Electric tanks that pull heat from the surrounding air. We size them, check the space and wiring needs, and install them with the condensate drain they require.
Water heater flushes
Draining sediment from the bottom of the tank helps the heater run quieter and more efficiently. The estimate for a flush is free.
Recirculating pumps
A pump that keeps hot water near the fixtures so you are not running the tap and waiting at a far bathroom. We install pumps and timer or on-demand controls.
Commercial water heaters
Larger tank and tankless systems for offices, shops and restaurants, plus repair and replacement when a business can't be without hot water.
Signs your water heater needs repair or replacement
No hot water, not enough hot water, leaks, strange noises and rusty or smelly water are the usual warning signs. Some are a simple repair. A leak from the tank body itself almost always means replacement.
| What you notice | What it usually means | How urgent |
|---|---|---|
| Water pooling under the tank | Leaking tank, fitting, drain valve or relief valve discharge | Urgent: shut off cold supply and call |
| Water coming from the relief valve pipe | Excess pressure or temperature, or a failing T&P valve | Urgent: this valve is a safety device |
| Popping or rumbling sounds | Sediment built up on the tank bottom | Soon: a flush may help if the tank is sound |
| Hot water runs out fast | Sediment, a failed element or dip tube, or an undersized heater | Soon |
| No hot water at all (gas) | Pilot out, failed thermocouple or flame sensor, gas valve, or venting fault | Same day |
| Rusty or rotten egg smelling hot water | Tank corrosion or anode rod reaction | Plan an inspection |
| Tankless unit shows an error code | Scale, venting, gas supply or ignition issue | Same day |
Why water heaters wear out in Walnut Creek homes
Water chemistry, age and earthquakes. Walnut Creek is split between two water suppliers, so two houses a few blocks apart can treat their heaters very differently, and a lot of the housing stock dates from the 1960s boom with water heater closets and garages laid out for older equipment.
EBMUD versus CCWD water
Which district serves you depends on your address. East Bay Municipal Utility District water comes mainly from the Mokelumne River watershed and is soft, with hardness in the range of 1 to 7 grains per gallon. Soft water means less scale in tanks and tankless heat exchangers. Contra Costa Water District draws mainly from the Delta through the Contra Costa Canal, blending with Los Vaqueros Reservoir, and Delta quality varies by season, with salinity higher in summer. If you are on CCWD water and running a tankless unit, regular descaling deserves more attention. Your water bill tells you which district you have.
Mid-century homes and tight spaces
Walnut Creek grew from under 10,000 people in 1960 to nearly 40,000 by 1970. Many homes from that era have the heater tucked into a hall closet or a corner of the garage. Fitting a taller tank, a tankless unit with new venting, or a heat pump model that needs surrounding air space takes planning. We look at the space before recommending a model.
Earthquake country
California law requires every new, replacement and existing residential water heater to be braced, anchored or strapped to resist earthquake motion. A heater that tips in a quake can break its gas line and water lines at the same time. When we replace a heater, the strapping is part of the job. If you just want the straps checked, see our earthquake safety plumbing page.
Tank vs tankless vs hybrid heat pump water heaters
A tank heater is the simplest replacement, tankless gives endless hot water at a limited flow rate, and a hybrid heat pump uses far less electricity than a standard electric tank but needs room and air around it. The best choice depends on your space, fuel and how your household uses hot water.
| Type | How it works | Good fit when | Watch out for |
|---|---|---|---|
| Gas tank | Burner heats a stored tank of water | You want a direct swap with existing gas and venting | Sediment, limited stored supply; regional air rules on new gas units are changing |
| Electric tank | Elements heat stored water | No gas available and a simple swap is the goal | Higher operating cost than a heat pump |
| Tankless (gas or electric) | Heats water only as it flows | Small footprint matters and demand is steady | Flow limits when several fixtures run; needs descaling; gas models may need a larger gas line and new venting |
| Hybrid heat pump | Moves heat from surrounding air into the tank | You have a garage or large room and want low operating cost | Needs air space, cools the room it sits in, needs a condensate drain and suitable wiring |
| Commercial units | Larger tank or multi-unit tankless systems | Restaurants, offices, multi-unit buildings | Sizing to peak demand is critical |
The U.S. Department of Energy says heat pump water heaters can be two to three times more energy efficient than conventional electric resistance heaters. It also notes they should sit in a space that stays between 40 and 90 degrees Fahrenheit year-round with at least 1,000 cubic feet of air around the unit, and that they tend to cool the space they are in. A Walnut Creek garage usually works well for that. A small hall closet usually does not without changes.
The Bay Area rule on new gas water heaters
The Bay Area Air District has a rule, adopted in 2023, that sets a zero nitrogen oxide standard for new residential water heaters starting January 2027. It applies at the time of replacement, not to heaters already installed, so your existing gas heater does not have to come out.
The district has proposed changes. Its draft would push the start date to January 2028 and add exemptions, such as for some low-income owners and properties with space or electrical limits. As of this writing the Air District Board is scheduled to consider those changes on November 4, 2026, so the final rule may change. If your gas heater is getting old, it is worth calling us now so we can talk through your options under whatever rule is in effect when you replace it.
How we repair or replace your water heater
We figure out whether a repair makes sense, give you a written price for each option, then do the work and leave the new heater strapped, tested and ready.
- Call and talk to a personWe answer 24/7. Tell us the heater type, what is happening and whether water is leaking, and we will give you shutoff steps if needed.
- Inspection on siteWe check the burner or elements, controls, venting, gas connection, T&P valve, strapping, expansion tank and the condition of the tank itself.
- Repair or replace, in writingWe explain what failed and give you a written price for repair and, if it makes sense, for replacement. Estimates are free and seniors get a discount.
- Permit and prepWater heater replacement generally requires a permit. We handle it, then drain and disconnect the old heater and protect the area.
- Install to codeNew heater set, seismic straps, gas or electrical connection, venting, T&P valve and discharge pipe, and an expansion tank where the system needs one.
- Test, haul away, explainWe fill, purge air, fire it up, check for leaks and proper venting, set the temperature, remove the old unit and show you the shutoffs.
Safety parts every water heater should have
A properly installed heater has seismic strapping, a working temperature and pressure relief valve with a discharge pipe, a shutoff valve on the cold supply, and on gas units correct venting and a gas shutoff. Many systems also need a thermal expansion tank.
Earthquake strapping
Required by California Health and Safety Code 19211 on new, replacement and existing residential heaters. Sellers must certify in writing to buyers that it is done, which is why strapping comes up at almost every home sale.
T&P relief valve
Opens if temperature or pressure in the tank gets too high. Its discharge pipe should run to a safe place. A valve that drips or opens often points to a pressure problem or a failing valve, and either needs a plumber.
Expansion tank
Water expands as it heats. In a closed system, such as one with a check valve or pressure-reducing valve, that pressure has nowhere to go. A small expansion tank absorbs it and takes stress off the heater and fixtures.
Venting and gas connection
Gas heaters must vent combustion gases outside. A disconnected or poorly sloped flue can spill exhaust into the house. We check venting on every gas heater visit and replace old flexible gas connectors.
If your water pressure is high throughout the house, the heater is only part of the story. Our water lines and re-piping page covers pressure-reducing valves and supply lines.
Water heater flushes and tankless descaling
A flush drains the sediment that settles at the bottom of a tank, and descaling clears mineral buildup inside a tankless heat exchanger. Both help the heater run quieter and heat more efficiently. We give free estimates on water heater flushes.
The rumbling or popping you hear from an older tank is usually water trapped under a sediment layer and boiling through it. A flush can quiet that down if the tank is still sound. On a very old tank that has never been flushed, we will tell you honestly if opening the drain valve risks starting a leak that wasn't there before.
How often depends on your water. Homes on soft EBMUD water build up less scale. Homes on CCWD water, where Delta quality changes through the year, may need tankless descaling more often. Your manufacturer's manual gives the recommended interval, and we follow it.
What affects water heater repair and replacement cost
The type and size of heater, how hard it is to reach, and the code upgrades your installation needs are the big factors. We give you a firm written price after we look, and the estimate is free.
- Repair versus full replacement, and the part involved.
- Tank, tankless, hybrid heat pump or commercial unit, and its capacity.
- Switching types: tankless often needs a bigger gas line and new venting; a heat pump may need a new circuit and a condensate drain.
- Location: a garage is easier than an attic or tight hall closet.
- Code items: seismic straps, T&P discharge, expansion tank, venting corrections.
- Permit and inspection, plus haul-away of the old unit.
We take Mastercard and Visa, and seniors get a discount. If the heater is near the end of its life, it often makes sense to replace it on your schedule rather than wait for a leak.
Water heaters in Rossmoor, condos and townhomes
In Rossmoor and other shared buildings, check who owns and maintains the water heater before you call anyone. Rossmoor is a 55+ community of about 6,676 homes managed by the nonprofit Golden Rain Foundation, and many units are co-ops or condos, so approvals and responsibilities can differ from a single-family home.
Condo heaters are often in small closets on upper floors, where a leak can reach the unit below. That makes a drain pan, a good cold water shutoff and attention to early warning signs more important. Tight closets also limit options: a heat pump model may not have enough air space, and a tankless unit may need new venting. We assess what will fit and work with your association's rules.
Water heater care you can do yourself
Homeowners can safely check for leaks, know where the shutoffs are and keep the area clear. Gas controls, venting, relief valves and replacements belong to a licensed plumber.
- Know where the cold water shutoff and gas valve or breaker are for your heater.
- Keep paint, solvents and storage away from a gas heater and its burner opening.
- Glance at the base and fittings now and then for rust, damp spots or drips.
- Make sure the seismic straps are snug and the heater cannot rock.
- Listen for new rumbling sounds and call for a free flush estimate if they start.
- If the T&P valve is dripping, don't cap or plug it. Call us.
Why Walnut Creek trusts us with water heaters
We are a family plumbing company serving Contra Costa and Alameda Counties since 1993, from our North Main Street shop in Walnut Creek. Owner Mo Williams grew up in the Bay Area and learned plumbing products and installation at Simon's Hardware in Walnut Creek and Home Depot in Concord.
One customer wrote on Google that Kevin solved their problem and fixed their water leak in a timely manner. That is the standard we hold to on every water heater call. Related pages: gas line repair for tankless gas upgrades, leak detection, and our 24/7 emergency plumber service. Or head back to the home page.
A family business led by Mo Williams since 1993
We are a Walnut Creek family business run from our North Main Street shop. Owner Mo Williams grew up in the Bay Area and learned plumbing products and installation from the inside out at Simon's Hardware in Walnut Creek and Home Depot in Concord. His wife Ann runs the books as CFO. We're rated 4.7 on Google from 251 reviews (October 2026). Meet Mo
Frequently asked questions
Should I repair or replace my water heater?
Replace it if the tank itself is leaking, because a leaking tank can't be repaired. Most other problems, like a failed thermocouple, gas valve, heating element, thermostat or relief valve, can be repaired. Age, repair cost, rust and how well the heater keeps up with your household all factor in. We give you written prices for both options so you can compare.
Do I need a permit to replace a water heater in Walnut Creek?
Yes, water heater replacement generally requires a permit. Inside city limits that goes through the City of Walnut Creek building office at (925) 943-5800, and unincorporated areas such as Saranap use Contra Costa County. We handle the permit as part of the job, and the inspection checks items such as seismic strapping, venting and the relief valve.
Is earthquake strapping required on water heaters in California?
Yes. California Health and Safety Code 19211 requires all new, replacement and existing residential water heaters to be braced, anchored or strapped to resist earthquake motion. Sellers must also certify in writing to buyers that it has been done. We install code-compliant straps on every replacement and can check or add straps on your existing heater.
Can I still install a gas water heater in the Bay Area?
For now, yes. The Bay Area Air District's rule sets a zero nitrogen oxide standard for new residential water heaters starting January 2027, applied at replacement, not to existing units. The district has proposed delaying it to January 2028 with some exemptions, and its board is set to consider that on November 4, 2026. Call us for the latest status.
Is a tankless water heater worth it?
A tankless heater makes sense if you want a small footprint and steady hot water without a storage tank. The trade-offs are a limited flow rate when several fixtures run at once, regular descaling, and, for gas models, frequently a larger gas line and new venting. We look at your space and usage before recommending one.
How does a hybrid heat pump water heater work?
It uses a heat pump to move heat from the surrounding air into the tank, with backup electric elements. The U.S. Department of Energy says these can be two to three times more efficient than standard electric tanks. They need roughly 1,000 cubic feet of air around them, a space between 40 and 90 degrees, and a condensate drain.
How often should I flush my water heater?
Follow your manufacturer's recommendation, and flush sooner if you hear rumbling or popping from sediment. Homes on soft EBMUD water usually build up less scale than homes on CCWD water, whose Delta supply varies through the year. LeapFrog gives free estimates on water heater flushes, and we tell you if your tank is too old to flush safely.
Why is water dripping from my water heater's relief valve?
The temperature and pressure relief valve opens when the tank gets too hot or the pressure too high. Dripping can mean high house pressure, thermal expansion in a closed system that needs an expansion tank, or a worn valve. Never cap or plug it, because it is a safety device. Call us to find the cause.
What does a hot water recirculating pump do?
A recirculating pump keeps hot water moving to fixtures far from the heater, so you get hot water faster instead of running the tap and waiting. Pumps can run on timers or on demand to limit energy use. We install them on tank and many tankless systems and can recommend a setup that fits your home's layout.
Do you repair commercial water heaters?
Yes. We repair, replace and install commercial water heaters for offices, shops, restaurants and multi-unit buildings, including larger tank and tankless systems. Because downtime matters for a business, we are available 24/7. We size replacements to your peak hot water demand and give you a free written estimate before starting any work.
Other ways we help Walnut Creek homes
Call a Walnut Creek plumber for water heaters
A real person answers 24 hours a day, 7 days a week. Tell us what's happening and we'll give you an honest arrival window and a free written estimate before any work starts.
Call now, day or night
(925) 887-6347- Licensed plumber, not a salesperson
- Free written estimate before work begins
- Senior discount, ask when you call
- Mastercard and Visa accepted
- Non-urgent questions: balzaparis@gmail.com
Water or sewage spreading? Shut off the fixture or main valve, then call. Smell gas? Leave first and call PG&E at 1-800-743-5000 or 911 from outside.
2108 N. Main Street, Suite F
Walnut Creek, CA 94596
Phone: (925) 887-6347
Email: balzaparis@gmail.com
Open 24 hours, 7 days a week