Serving Houston, inside Loop 610 and out
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Tankless Water Heater Installation in Houston, TX
Our Services

Tankless Water Heater Installation in Houston, TX

Tankless Water Heaters · Houston, TX

Tankless water heaters sized for the fixtures your house runs at once

Tankless water heater installation in Houston covers two jobs. One is switching a gas or electric tank to a tankless unit. The other is replacing an old tankless unit with a new one. Master plumbers on our team size each unit for your house. On a gas unit, they also check the gas line and put in new venting. If a new tank suits your house better, we handle tank water heater replacement too.

VCS Construction and Remodeling has been contracting in Houston since 2007. Our electricians check the panel when the new unit is electric. Our own crew handles the drywall and paint work that plumbing-only companies leave behind. We install tankless water heaters across Harris County, in places like Montrose, Houston Heights, River Oaks and Bellaire. Estimates are free, and we set a date after the estimate.

What We Handle

  • Tank to tankless water heater conversions
  • Tankless water heater replacement for older units
  • Sizing by flow rate for fixtures used at once
  • Larger gas line run when the unit needs it
  • New venting plus condensate drains on condensing units
  • Service valves added so the unit can be flushed
  • City plumbing permit pulled by our master plumbers
  • Old tank closet closed in and patched

Free Tankless Water Heaters Estimate

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Is a Tankless Water Heater Right for a Houston Home?

A tankless water heater heats water as it flows, with no tank to keep hot. HomeGuide says a built-in flow sensor starts a gas burner or electric coils when you open a hot tap. When the tap closes, the unit stops heating the water. HomeAdvisor says that with no tank to corrode, the risk of leaks and water damage drops. That counts most when the heater sits in an attic, above a ceiling. It also takes less space than a tank, HomeAdvisor notes.

HomeAdvisor says on-demand heating avoids the energy a tank wastes keeping water hot. It puts the efficiency gain at 24% to 34%. That range is for homes using up to 41 gallons of hot water a day. Angi says the gain is closer to 8% in households that use a lot of hot water. The trade-off is the install: Angi says first-time installations cost more than replacements, because of added electrical work and piping.

HomeGuide says smaller units may not supply enough hot water at one time. A shower can turn lukewarm when the washer starts, so sizing comes first. Our master plumbers add up the flow rate, in gallons per minute (GPM), of the fixtures that run at once. Angi lists a conventional shower head at 4 to 6 GPM and an eco-friendly one at 2 to 3 GPM. A washing machine adds 2 to 2.5 GPM, and HomeAdvisor says to count each shower separately.

What Does Tankless Water Heater Installation Involve in Houston?

The Census Bureau's 2020 to 2024 American Community Survey shows the age of Houston's housing. Nearly half of the city's homes and apartments were built in 1979 or earlier. In many of those houses, the gas line and vent were sized for a tank. HomeGuide says gas units cost more to install because of the need for new gas lines and venting. Many conversions need a larger gas line, which HomeGuide puts at $350 to $2,000. Our master plumbers check the gas line and run a larger one when the unit needs it.

Gas tankless water heater installation also means new venting. HomeGuide says the old tank gas vent cannot be reused, and puts new exhaust vents at $100 to $600. A condensing unit uses a second heat exchanger to capture more heat from the exhaust. HomeGuide says it needs special venting such as PVC plus a condensation drain, which our master plumbers add. Non-condensing units cost about 25% less to install, HomeGuide says, but they send more heat out the vent.

The new unit can hang where the old tank stood, such as the attic or the garage. A gas unit can also go outside, and HomeGuide shows one installed outdoors. HomeAdvisor says many homes must be adapted for a tankless system, which can mean new piping and possibly drywall work. When the unit moves, our own crew closes in the old tank closet and patches what the job opens. Angi says moving a water heater to a new location drives up installation costs. If bathroom remodeling already has the walls open, the move fits into that job.

Our master plumbers add service valves so the unit can be flushed later. Inside the City of Houston, every tankless water heater installation or replacement needs a plumbing permit. The Houston Permitting Center says no plan review is needed for a water heater at a single-family home. Master plumbers on our team pull that permit, and we meet the inspector on the job. Bellaire, West University Place, Pearland and the Memorial Villages run their own permit offices.

Gas or Electric Tankless in Houston: What Your House Needs

Which type fits depends on the house and how much hot water it uses at once. HomeGuide says gas units have a higher maximum flow rate, which makes them better for larger homes. HomeAdvisor puts the upper limit for electric models around 8 GPM, and says some natural gas models reach 20 GPM. HomeGuide puts a gas tankless water heater at $2,100 to $5,600 for the unit, labor and required modifications. It puts an electric unit at $1,400 to $3,000 installed, and calls electric cheaper and easier to install.

An electric unit needs no gas line, and Angi says electric water heaters don't require added ventilation. Power is the catch. An expert quoted by HomeAdvisor says a whole-house electric unit needs 240-volt, 80-amp hard-wired service at a minimum. The home then needs at least 150-amp service, so our electricians check the panel first. HomeGuide says a higher-capacity panel may be necessary and puts replacing the panel at $850 to $1,700. When it is needed, we handle the electrical panel replacement too.

Old supply lines can change the plan too. Angi says an install can take more work when old pipes require cleaning or replacement. If the house is due for whole-house repiping, the new lines and tankless unit can go in together. Master plumbers on our team handle both, and our own crew patches the walls and ceilings after. Call (713) 828-3097 for a free estimate, and we set a date after the estimate.

A gas tankless water heater installation on a plywood wall, with the copper gas line, white PVC vent pipes and a dedicated outlet Service valves, copper water lines and the gas connection under a newly installed tankless water heater

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What You Can Expect

How a Job With VCS Construction Runs

From the first call to the last pass of the rake, here is how it goes.

1

Call or Send the Form

Tell us about the house and the project. We set a time to come see it, usually within a few days.

2

Free Estimate and Design Consult

We look at the space and the systems in person and talk through the plan. You get a real number before any work starts.

3

Plans, Permits, Build

Drawings get done, permits get pulled, and the build starts on a set schedule. We review progress with you week by week.

4

Finish Work and Final Walk

Our own crew does the sheetrock, trim and paint, then walks the finished job with you. The project ends when you sign off on it.

FAQ

Tankless Water Heaters Questions, Answered

Common questions about tankless water heaters across Houston, inside Loop 610 and out. Don't see yours? Give us a call and ask.

Call (713) 828-3097

How much does tankless water heater installation cost in Houston?
Angi's 2026 cost guide puts tankless water heater installation at $1,406 to $3,902, with $2,641 on average. HomeGuide puts it at $1,400 to $5,600 installed, and the fuel type sets where a job lands. Gas line and venting work can push it higher, and so can a panel upgrade. Our tankless water heater cost in Houston guide breaks down the numbers.
What size tankless water heater does my house need?
It depends on how many fixtures run at once. HomeGuide calls 3.5 GPM the minimum suggested size for one or two fixtures, like a shower and a sink. It says 5 GPM is recommended for two or three fixtures. For three or four fixtures, HomeGuide says 7 GPM or higher is needed. Our master plumbers size yours from the fixtures in your house.
Do I need a permit to install a tankless water heater in Houston?
Yes. The Houston Permitting Center says a plumbing permit is required for the replacement and installation of water heaters. It must be obtained by a master plumber registered with the City of Houston. The work must be inspected and approved by a plumbing inspector before the project is finalized. The master plumbers on our team pull the permit and meet the inspector.
How long does a tankless water heater last?
HomeGuide says a tankless water heater lasts 15 to 20 years with proper maintenance, nearly double a standard tank. Angi says tankless units may need occasional maintenance due to hard water and mineral buildup. HomeGuide's cleaning steps include running a descaling solution of half white vinegar and half water through the unit. The service valves we add make that flush simpler.
Do you replace old tankless water heaters?
Yes, we handle tankless water heater replacement as well as tank conversions. HomeGuide says swapping an old tankless unit for a same-type model is easier and cheaper than a retrofit. We still size the new unit and check its gas or power supply before it goes in.
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We remodel kitchens across Houston, from Heights bungalows to postwar ranch homes. One contractor handles design, structure, trades, and finish work on every job.

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We design and build home additions across Houston, from room additions to full second stories. One contractor takes your project from plans and permits through paint.

Why Choose VCS

Why Houston Homeowners Call Us

One Contractor, Start to Finish

The team that opens your walls is the team that closes them. Trades, sheetrock, tile, cabinets, trim and paint all run under one contract, so nothing falls between companies.

Master Plumbers On the Team

Repipes, sewer lines, water heaters and remodel plumbing stay in house. That is rare for a remodeling contractor, and it is why pipe problems do not stall our jobs.

Design-Build Under One Roof

An architect, two engineers and interior designers work with us on plans, or we build from your designer’s drawings. Permits and city inspections are handled for you.

Built for Houston Houses

Pier and beam bungalows, slab ranches on clay soil, galvanized pipe, cast iron drains, deed restrictions and flood maps. We have worked these streets since 2007 and plan for all of it.

Reviews

What Our Clients Say

Real feedback from Houston homeowners we've remodeled and built for.

See Our Work
VCS did an outstanding job on our kitchen and master bed/bath remodel. What made them different was their attention to detail from start to finish. Trey would meet with us on a weekly basis to review completed work as well as scheduling and work for the following week. His team was extremely professional, knowledgable, and courteous. They went above and beyond for us and the quality of work was fantastic. They focused and kept to the scheduled timeline. I would highly recommend VCS Construction and Remodeling.
Jennifer L.Katy, TX
VCS Construction was as professional as it gets. Our exterior project was completed on budget and on time with the attention to detail on quality. Any issues or concerns were handled quickly and professionally. I would recommend them to everyone.
Brian R.Houston, TX
We hired VCS for a custom garage buildout and they delivered to the highest degree. Trey went over countless ideas for what I wanted and I could not be happier with the outcome. He is a well respected car guy in the community so he does know his stuff when it comes to custom Garages. Well Done!
John B.Montrose, Houston
Guides & Resources

Tankless Water Heaters Guides

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Get In Touch With VCS Construction

A kitchen that needs to open up, a bath past its prime, an addition, or pipes that are done? Call or send the form. We come to look at the house in person, and the estimate and design consultation are free.

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Tell us about your project and we’ll get right back to you.

Call (713) 828-3097