★★★★★ 5.0 on Google · 25 reviews · Licensed FL #CFC1434171 · Insured Jacksonville Beaches · St. Johns County · Palm Coast · (904) 754-9877
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Water heaters

Tankless water heater installation & service

Never run out of hot water again. We install, convert, descale and repair gas and electric tankless water heaters, and size them correctly so they actually keep up.

  • 5.0 ★ on Google
  • Licensed FL #CFC1434171
  • Same-day service
  • Owner on every job
Water heater installation by CMA Plumbing

Is tankless right for your home?

A tankless water heater heats water only when you open a tap. You get endless hot water, more space in the garage, and a unit that can last around twice as long as a tank. It’s a popular upgrade in larger homes across Nocatee, Ponte Vedra and St. Johns.

The key is sizing: a unit that’s too small will feel lukewarm when two showers run at once. We size by flow rate and incoming water temperature, and check that your gas line, venting or electrical service can support it.

Tank vs. tankless

TankTankless
Hot water supplyLimited by tank sizeEndless, on demand
Typical lifespanAbout 8–12 yearsAround 20 years with maintenance
Equipment costLowerHigher (may need gas/electric upgrades)
SpaceLarge footprintCompact, wall-mounted
MaintenanceFlush yearlyDescale yearly in hard water

Tankless installation, step by step

  1. Load calculation

    We count fixtures and flow to choose the right size.

  2. Gas, venting & power check

    We confirm gas line size, venting route or electrical capacity.

  3. Professional install

    Mounted, vented and piped to code, with isolation valves for easy descaling.

  4. Setup & walkthrough

    Temperature set, system tested, and we show you how maintenance works.

Thinking about going tankless?

Get an honest assessment of whether tankless fits your home.

Why homeowners choose CMA Plumbing

Licensed & insured

Florida license CFC1434171 and full insurance, for your protection and peace of mind.

The owner does the work

Marian handles your job from the first call to the cleanup. No subcontractors.

Clean, courteous plumbers

We wear shoe covers and leave your space spotless.

Warranty on parts & labor

We stand behind our work with a 100% satisfaction guarantee.

“Mario showed up when he said, installed a tankless water heater and removed the old one. It’s working great. Top notch professional.”

★★★★★Dawson D. · Yelp review
CMA Plumbing job photoCMA Plumbing job photoCMA Plumbing job photo

Tankless Water Heaters FAQ

Do tankless water heaters need maintenance?

Yes. In hard water areas like ours, plan on descaling about once a year. It keeps efficiency up and prevents error codes.

Why does my tankless heater give me a cold-water sandwich?

A short burst of cold water between uses is normal for many units. Recirculation can reduce it. We can advise on options.

Can I switch from an electric tank to tankless?

Often yes, but electric tankless units need significant electrical capacity. We’ll check before recommending it.

Do you repair tankless units you didn’t install?

Yes. We service most major brands.

Book a visit

Tell us what’s going on. We’ll call you back fast.

For leaks, no hot water or backups, call. You’ll reach the owner, not a call center.

Call or text(904) 754-9877
Service areaJacksonville Beaches, St. Johns County & Palm Coast
Hours
Mon – Fri8:00 am – 8:00 pm
Saturday8:00 am – 5:00 pm
SundayEmergencies only
🚨 Water leaking right now? Shut off the main valve, then call now →

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Plumbing problem right now?

Talk to the owner directly. Most calls get same-day service.

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