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Pacifica, San Francisco, Burlingame, CA · Serving the Bay
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A tankless water heater heats water as you use it, so the hot water does not run out halfway through the second shower. Works Plumbing handles tankless water heater installation in Redwood City, CA, from first-time conversions to replacing an older tankless unit.
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Get a tankless installation estimate and we will walk your home with you.
Key Takeaways
Tankless units suit many households, but not every one. Here is a quick comparison.
| Factor | Tank water heater | Tankless water heater |
|---|---|---|
| Hot water supply | Limited by tank size | Continuous while flow stays in range |
| Space | Floor footprint | Wall mounted |
| Gas demand | Lower burner rating | Much higher burner rating |
| Venting | Standard vent on most models | Dedicated venting, often sealed |
| Maintenance | Yearly flush | Periodic descaling of the heat exchanger |
A tankless heater makes the most sense when a household runs out of hot water often, wants floor space back, or plans to stay in the home long enough to see the efficiency pay back.
A conversion is more than swapping one appliance for another. We look at four systems before we quote.
Tankless gas units need far more gas at full fire than a typical tank heater. The existing gas line often cannot deliver it. We check pipe size and length back to the meter, and we run a larger line when needed. New gas piping is pressure tested before the unit is fired. Our gas line repair team in Redwood City handles that work when the line needs more than a new connection.
Most tankless units vent through a sealed system, through the wall or roof. We plan the vent route and terminal location to meet the manufacturer’s clearances.
We confirm incoming pressure and flow, add isolation valves for future service, and install the recirculation loop if you choose one.
The City handout does not allow water heaters in bedrooms, bathrooms, or the closets of those rooms. Garages, utility rooms, and exterior walls are the usual spots.
A tankless heater lasts longest with periodic descaling of its heat exchanger. Redwood City’s water is soft on average, about 62 ppm hardness in the City’s 2025 water quality report, so scale builds slowly here. We still install service valves so descaling is quick, and we recommend a schedule based on your usage.
Other maintenance items:
“Will I really never run out of hot water?” Only if the unit is sized for the flow you use at once. Two showers and a dishwasher running together need more capacity than one shower. We size for your real peak.
“Why is there a short delay before hot water arrives?” A tankless unit needs a moment to fire, and the hot water still has to travel the pipe. A recirculation loop shortens that wait.
“Can it run during a power outage?” Most gas tankless units need electricity for controls and the fan, so they stop when the power does. Plan for that the same way you would for a furnace.
If tankless is not the right fit, a new tank heater may be. Read about our water heater installation service in Redwood City, and we will price both options side by side.
Works Plumbing is family owned and operated and has served the Peninsula from Pacifica since 2009. On every tankless project:
We install tankless heaters across the city, including Redwood Shores, Woodside Plaza, Downtown, Roosevelt, Friendly Acres, and the Farm Hill Road area. See all our local services on the Redwood City plumbing page, or learn more about our tankless water heater service.
Do I need a permit to install a tankless water heater in Redwood City?
Yes. The City requires a plumbing permit to install, replace, or relocate a water heater, issued before work begins. Gas piping changes are part of the same job, and we handle the permit and inspection.
Does my recirculation line have to be insulated?
Yes. The City’s water heater handout requires recirculation lines to be insulated their full length, along with hot and cold pipes within 5 feet of the heater. Insulation also keeps the system efficient.
Can my tankless heater go in a bathroom closet?
No. The City does not allow water heaters in bedrooms, bathrooms, or their closets. We help you find a compliant location, often a garage or exterior wall.
Will my existing gas line support a tankless unit?
Often not without changes. Tankless units draw much more gas at full fire. We check pipe size and run length on the walk-through and include any upgrade in the quote.
How often does a tankless heater need descaling in Redwood City?
Less often than in hard water areas. The City’s 2025 report lists average hardness of 62 ppm, which is soft. We set a schedule based on your water use and the manufacturer’s guidance.
Can you replace an old tankless unit with a new one?
Yes. A like-for-like swap is often simpler than a first conversion, because gas and venting may already be sized. We still check both against the new unit’s requirements.
Endless hot water starts with the right plan. Book tankless water heater installation in Redwood City and get a complete, upfront quote.
We’re highly experienced with: Leak detection Drain cleaning Drain repair Rooter services Water heaters Sprinkler systems Tankless water heaters Toilet repair & installation Faucet repair & installation Shower repair & installation Trenchless sewer repairs Camera inspections Garbage disposals Gas lines Gas valves Burst pipes Pipe repair Sump pumps Sewer repairs Hydro jetting Pipelining Plumbing repairs
Tankless Water Heater Replacement – Upgrade for Superior Performance Looking to replace your old water heater? Works Plumbing specializes in tankless water heater replacement, providing you with advanced technology and improved efficiency. Our team ensures a smooth transition to a new system, enhancing your home’s hot water supply while cutting down on energy costs. Contact us today for a reliable and efficient replacement service. Ready for tankless water heater installation? Give us a call today to talk about your options for your Redwood City home. Plumbing Repair Toilet Repair Shower Repair Hydro Jetting Camera Inspection Leak Detection Gas Line Repair Trenchless Pipe Repair Water Line Repair Sump Pumps Garbage Disposal Drain Cleaning Faucet Repair Hot Water Heater Repair Tankless Water Heaters
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Many tankless installs add a recirculation loop, so hot water reaches far fixtures quickly. That loop is where Redwood City’s rules matter most.
The City of Redwood City Replacement Water Heaters handout, revised in January 2026, lists requirements an inspector checks on any water heater installation:
The insulation rules have a practical reason. A recirculation loop keeps hot water moving through the pipes so it is waiting at the tap. If that pipe is bare, it gives off heat along every foot of its run, under floors, in walls, and through the garage. The water cools, and the heater fires again to bring it back up. An uninsulated loop can quietly spend much of the energy savings a tankless unit was bought for.
We at Works Plumbing plan the loop before we quote. We trace where the recirculation line will run, include insulation for its full length, and choose a control approach, such as a timer or on-demand button, that fits how your household uses hot water. The result is faster hot water without a heater that never rests.
We also serve these neighboring Peninsula towns.
We’ve earned our reputation one happy homeowner at a time.
“Thank you again for another job well done, and thank you for responding right away. I will continue to recommend Works Plumbing because they respond right away and get the job done efficiently.”
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