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Lic. CAC1819196 · CFC1431159
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Plumbing Troubleshooting

Tankless Water Heater Not Heating?

Tankless water heater not producing hot water? Usually a fixable sensor or ignition issue. Tampa hard water requires annual descaling. Rheem is our preferred tankless brand. CFC1431159.

Quick Answer

Tankless not heating in Tampa = (1) clogged inlet filter (Tampa hard water), (2) scale buildup in heat exchanger (annual descale needed $279), (3) failed flow sensor, (4) ignition failure (gas models), or (5) undersized for demand. Check error code on display, photograph it. Tankless maintenance $279. Call (813) 343-2212.

5 Tankless Failure Causes

Clogged Inlet Filter

Call a tech

Symptom: Low flow rate, tankless can’t sense enough water to fire.

Filter cleaning part of annual maintenance $279.

Scale Buildup

Call a tech

Symptom: Tankless 3+ years without descaling. Tampa hard water clogs heat exchanger.

Descaling + maintenance $279. Required annually in Tampa.

Failed Flow Sensor

Call a tech

Symptom: Tankless doesn’t fire even with good water flow.

Flow sensor replacement $279-$399.

Ignition Failure (Gas)

Call a tech

Symptom: Display error code, no ignition sound when hot water called.

Gas valve, igniter, or thermopile replacement $279-$399.

Undersized for Demand

Call a tech

Symptom: Works for one fixture, fails when 2+ running simultaneously.

Upgrade to larger unit. Rheem tankless $2,854-$4,574.

What to Do Right Now

  1. Photograph error code on display.
  2. Check gas supply (gas tankless) or breaker (electric).
  3. Last descaled? If over 12 months: needs service.
  4. Call (813) 343-2212 with error code.

FREE diagnosis. Maintenance/descale: $279. Sensor/ignition: $279-$399. New Rheem tankless: $2,854-$4,574.

FAQ

Why annual descaling?

Tampa hard water (7-10 grains/gal) scales inside the heat exchanger, reducing efficiency + eventually failing. Descaling removes it. Skip = voided warranty.

Rheem vs Navien vs Rinnai?

Rheem is our preferred install, strong Tampa parts availability, good warranty, handles hard water well. All three are premium brands.

Can tankless run without descaling?

For a while. By year 3-5 without maintenance, performance drops. By year 7, often failed. Annual $279 maintenance doubles lifespan.

Electric tankless issues?

Usually element failure or scale. $279 service. Electric tankless needs 200A panel + dedicated 80A+ circuit, verify home has capacity.

Need Tampa Service Today?

Same-day Tampa Bay. FREE diagnosis. (813) 343-2212.

★★★★ 4.8 (1,333 verified reviews)
Verified4.8★ · 1,333 reviews
🛡 FL Licensed: CAC1819196 · CFC1431159💼 $1M General Liability + Workers’ Comp🏠 Family-owned since 2017⚡ Same-day service
★★★★★Water heater

I'm glad they use a texting system for reminders and when the tech is on the way. Alejandro has done out checkups the last few times and is always courteous and conscious…

Luis Fonseca · · Google
★★★★★Water heater

As an engineer/fabricator/assembler, I have high standards from my contractors. This guy Sam, he fulfilled all my requests and installation needs. He took pride of his work, and left me with a…

ALEXANDROS ORESTIS · · Google
★★★★★AC repair

Dusty did a great job and provided honest service and pricing for our AC repair. He also went above and beyond in giving sound advice on our new home renovations!

Dalton Grados · · Google
★★★★★AC repair

I have used this company for AC repairs and plumbing maintenance. They keep track of scheduled maintenance. It's easy to create appointments. Every technician who has sent here has been very helpful…

Kat · · Google
★★★★★

Home Therapist is dependable, reliable, trustworthy and knowledgeable and provides ALWAYS Great Service!!!

Ken Miller · · Google
★★★★★Maintenance

Their yearly plan provides 2 inspections and a bunch of other services for less price than what many other companies are charging for a single service visit. And service has been perfect…

Dhruv Patel · · Google
★★★★★Plumbing

I had a great experience with Alejandro from Home Therapist Cooling, Heating, and Plumbing. He repaired two toilets and installed the water line to my new refrigerator after the delivery team refused…

Thomas Jones · · Google
★★★★★AC repair

Amazing service from start to finish. My AC system completely stopped working, and they were able to come out the same day, which was a huge relief. The technician was professional, knowledgeable,…

Manny Velasquez · · Google
★★★★★Plumbing

A big THANK YOU to Home Therapist Cooling, Heating and Plumbing for running sewer pipes to our RV and shed! Samuel was beyond amazing! He was prompt, professional, and his communication style…

Mindy Walker · · Google
Latest review: May 2026 · auto-refreshed daily
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Reviewed by Alejandro MoralesCo-Owner & FL Certified Plumbing Contractor, Home Therapist

Alex co-owns Home Therapist Cooling, Heating, and Plumbing and holds the FL Certified Plumbing Contractor license (CFC1431159) earned in 2021. The company holds licenses CAC1819196 (FL Class B AC Contractor, Richard Morales) and CFC1431159 (FL Plumbing Contractor, Alex Morales), serving the Tampa Bay metro with a six-technician field team and 1,378+ verified five-star reviews.

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