Tankless Water Heaters in Collinsville, TX

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WAIVED

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VALID THROUGH SEPTEMBER 2026 · RESTRICTIONS APPLY

Offer codes, details & exclusions

Trip fee: WAIVEDTRIPFEE
Water heater installation: 10WHI
Camera inspection: FreeCI

Valid in the designated service area. Mention the offer at booking. Limit one use per household. Offers cannot be combined or used with membership packages, emergency trip fees, or prior services. The published terms state that the $85 mandatory trip fee does not count toward a qualifying minimum repair charge. Exterior-accessible cleanouts are required for drain offers; otherwise, a standard trip/service fee applies. Offers are subject to change or revocation without notice. Read complete offer terms.

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PROUDLY SERVING

COLLINSVILLE,
TEXAS

COLLINSVILLE, TEXAS

Reviews for Lex’s Plumbing across our service area.

Hear from Our Customers

Lex’s Plumbing is proud to be a winner for Nextdoor’s 2023 Neighborhood Faves

      EXCELLENT  
   Based on 1045 reviews 
    
 
 
 
   
 
 
      Posted on Google  
   
   Sherrie 
 1 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Lionel did a great job.  Prompt and courteous!
  
 
     Posted on Google  
   
   Greg Beckwith 
 7 days ago
 
 
 Trustindex verifies that the original source of the review is Google. The plumbing project needed a professional, and Lex Plumbing's Eric was the go-to guy today.  First and foremost, he was a pleasure to talk to, and he fully explained the repair needed.  He took care of the repair needed to our 1/2 bath and all looks and works great.Thanks Eric, and thanks Lex, a job well done.
  
 
     Posted on Google  
   
   Bryan Taylor 
 7 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Reasonable cost, excellent work, and knowledgeable plumbers!  What else can I say? Give them a call and they'll do great work!
  
 
     Posted on Google  
   
   Gale Johnson 
 7 days ago
 
 
 Trustindex verifies that the original source of the review is Google. 
  
 
     Posted on Google  
   
   Jo Foster 
 7 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Very nice service employee and very helpful ! Walked me through everything he did along with recommend help moving forward.
  
 
     Posted on Google  
   
   Ryan Becker 
 9 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Les's Plumbing is awesome!  I've used their services many times for various things over the years.  Right now they are working with me on a major master bathroom remodel, and it's going as smooth as silk.  All of their techs are very professional, friendly and communicative.  I highly recommend this company.
  
 
     Posted on Google  
   
   _ Anderson 
 9 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Sean did a great job unclogging my sink and shower today. He answered all my questions and even spoke to my son about how to become a plumber.
  
 
     Posted on Google  
   
   Ray Stovall 
 13 days ago
 
 
 Trustindex verifies that the original source of the review is Google. 
  
 
     Posted on Google  
   
   Pam Matlock 
 13 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Highly recommend! Came out to help with a last minute emergency and got us taken care of!! Excellent customer service!
  
 
     Posted on Google  
   
   Katie O. Gallivan 
 13 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Very pleased with work done and the gentleman was very knowledgeable and helpful

Tankless water-heater service and conversion in Collinsville

A tankless heater should be selected for the hot water your home needs at the same time. Lex’s Plumbing helps Collinsville homeowners compare tankless installation, repair, and maintenance options. We consider the equipment and the work needed around it, rather than treating a conversion as a simple tank swap.

For an existing unit, record its model and any displayed error code. Tell us whether the water goes cold during one task or only when several fixtures run together. Those details help separate a fault from a demand or installation issue.

Sizing a tankless water heater for simultaneous use

Count the fixtures you expect to use together, such as two showers and a kitchen tap. Required flow and the temperature increase from incoming water to the desired outlet temperature both matter. A capacity claim without those conditions does not tell you what a unit will deliver in your home.

The Department of Energy identifies maximum simultaneous flow and required temperature rise as sizing inputs. We do not assign every Collinsville house the same incoming-water temperature or recommend equipment from bedroom count alone. See U.S. Department of Energy tankless sizing guidance.

Gas, electrical, and venting changes for tankless conversion

An existing tank location may need changes to fuel supply, electrical service, vent routing, clearances, condensate handling, or service access, depending on the selected equipment. Those changes belong in the proposal before you commit to a model.

Think about maintenance access as well as appearance. A tightly enclosed installation may be harder to service. Tell us if your goal is reclaiming floor space, supporting overlapping showers, or replacing unreliable equipment so the recommendation addresses your actual reason for changing.

Troubleshooting an existing tankless water heater

Intermittent hot water is not a diagnosis by itself. We consider error history, flow demand, supply conditions, and the manufacturer’s service information. If only one fixture behaves differently, its valve or flow restriction may also need attention.

Avoid repeatedly resetting the unit while ignoring a recurring fault. Note when the interruption occurs and whether it clears when another fixture stops. Do not remove combustion or electrical covers to investigate it yourself.

Tankless maintenance for your model and water conditions

A service interval should follow the manufacturer’s requirements and the conditions measured at the property. We do not assume a citywide hardness number or prescribe identical flushing intervals for every Collinsville home.

Keep installation records, model information, and prior service dates together. If treatment equipment is present, tell us what it treats and when its media or filters were last serviced. A filter and a softener perform different jobs.

Tankless permits and water-quality checks in Collinsville

Collinsville lists a single-trade permit application and directs owners to check applicable projects with City Hall. A conversion can involve more than the heater itself, so the address and proposed plumbing or gas changes need to be reviewed before work begins. See City of Collinsville permit information.

The city’s 2024 water report identifies groundwater from the Woodbine Aquifer in Grayson County as its source. That is a specific fact about the city system, not a hardness measurement at your heater. Confirm the provider on your bill and use actual water conditions when planning scale-related maintenance. See City of Collinsville 2024 water-quality report.

Tankless Water Heaters questions

Does tankless mean unlimited hot-water flow?

No. A unit has a capacity at a given temperature rise. Using several fixtures together can exceed that capacity even though there is no storage tank to empty.

Can my existing gas connection serve a tankless heater?

It must be checked against the selected unit and the other connected appliances. Do not assume the connection is sufficient because it served a tank heater.

Will a tankless unit make hot water arrive instantly?

Not necessarily. Pipe distance and the distribution layout affect how long hot water takes to reach a fixture. Discuss any recirculation proposal separately.

How often should a tankless water heater be serviced?

Use the model’s instructions, service history, and water conditions. We can review those factors instead of giving every installation the same schedule.

Related plumbing services in Collinsville

Explore all Collinsville plumbing services

Schedule tankless water-heater service in Collinsville

Tell us the service address, the problem, and any inspection or equipment information you already have. We will discuss availability and the next step.

Prefer to call? Reach Lex’s Plumbing at (469) 362-5397. Mention the current special when booking and review the offer terms.