Tankless Water Heaters in Collinsville, TX

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Mention your offer when you book your service.

WAIVED

99$

VALID THROUGH OCTOBER 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.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 1057 reviews 
    
 
 
 
   
 
 
      Posted on Google  
   
   Rick Mercado 
 3 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Erik came out and did a great job for us. Would highly recommend him.
  
 
     Posted on Google  
   
   Bobby Pugh 
 3 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Jimmie did a fantastic job with the toilet rebuild. He was courteous, quick and professional. Grateful to have a seasoned professional like Jimmie to help get everything repaired correctly.
  
 
     Posted on Google  
   
   Thu Gary 
 4 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Jimmie was professional and competent. Thank you Jimmie.
  
 
     Posted on Google  
   
   Karen Calfee 
 5 days ago
 
 
 Trustindex verifies that the original source of the review is Google. I had a water leak alert notification from Town of Little Elm.  Lex's responded within 2 hours.  Toilet leak was detected and I decided to replace the toilet which I was planning to do. Meter showed there was still something else leaking and Sean found it to be in irrigation.  Sean did an excellent job installing new toilet and cleaned up after completion. Sean fully explained all options and pricing so I could make an informed decision.
  
 
     Posted on Google  
   
   Andrey Podymaev 
 6 days ago
 
 
 Trustindex verifies that the original source of the review is Google. +0
Jimmy fixed our plumbing issue quickly and did a great job. There was a lot of digging involved, but he somehow managed to leave the lawn looking almost untouched. Really appreciate his care and hard work. Highly recommend!
  
 
     Posted on Google  
   
   Israel Maskill 
 7 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Jimmy was awesome! Highly professional and very personable. Next time I need any plumbing work done, I will call and ask for Jimmy. Very satisfied.
  
 
     Posted on Google  
   
   John Domin 
 10 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Great work and cleaned up afterwards.
  
 
     Posted on Google  
   
   Brent Coleman 
 10 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Lex's Plumbing has great service, Mathew was very polite and very quick to respond and fix the problem! Happy with them, will call again.
  
 
     Posted on Google  
   
   Debby Murr 
 10 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Matthew was very knowledgeable about all that he had to do.  He was so nice and cleaned up after himself.
  
 
     Posted on Google  
   
   Donna Peake 
 12 days ago
 
 
 Trustindex verifies that the original source of the review is Google.

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.