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Plumbing

Water Heater Repair & Installation in Charleston, SC

Whether your water heater is leaking, running cold, or simply at the end of its life, Holy City Heating & Air repairs and replaces tank and tankless water heaters across the Charleston area — with straight answers about whether repair or replacement is the smarter spend.

What this service covers

Water heater service spans quick fixes — elements, thermostats, relief valves, pilot and ignition issues — through full replacement with conventional tank units or tankless systems.

Replacement is also the moment to reconsider fit: household size, recovery speed, energy source, and where the unit lives (garages and elevated homes each have their own considerations here).

Why it matters in the Lowcountry

A failing water heater rarely announces itself politely. Tanks corrode from the inside out, and the first obvious symptom is often a puddle — or worse, a burst tank above a finished space.

Coastal water chemistry and sediment accelerate tank wear, which makes periodic flushing and anode checks more valuable here than in many markets.

Signs it’s time to call

  • Water that runs lukewarm or runs out fast
  • Rusty or metallic-tasting hot water
  • Rumbling or popping sounds from the tank (sediment)
  • Moisture, drips, or corrosion at the base of the unit
  • The unit is past roughly its tenth year and showing any of the above

How the visit works

  1. Evaluate

    We check the unit's age, condition, and installation, and test components before recommending anything.

  2. Repair or replace — your call, informed

    Younger units with isolated faults get repaired. Corroded tanks near end of life get an honest replacement recommendation with options and clear pricing.

  3. Install to code

    Replacement includes correct relief-valve discharge, drain pan and expansion provisions where required, and haul-away of the old unit.

What affects the price

Every home is different, so we quote in writing before work begins. The main factors:

  • Tank vs. tankless, capacity, and fuel type
  • Location and accessibility of the unit
  • Code items the new install must include (pans, expansion tanks, venting)
  • Gas line or electrical upgrades a tankless conversion may need

Repair or replace?

A leaking tank is a replacement — the corrosion that caused it can't be repaired.

Component failures on a younger unit (elements, thermostats, valves) are usually worth fixing.

Tankless conversion makes the most sense when you're already replacing and want endless hot water and space savings; we'll be straight with you about the added install scope.

Keeping it running

  • Flush the tank periodically to clear sediment — it extends life and quiets the rumble.
  • Test the temperature-and-pressure relief valve occasionally.
  • Tankless units need periodic descaling in our water; put it on the calendar or on a plan.

Water Heaters: common questions


How long do water heaters last in Charleston?

Conventional tanks commonly serve about a decade, sometimes more with maintenance; tankless units typically last considerably longer. Local water chemistry and whether the tank was ever flushed make a real difference.

Tank or tankless — which should I buy?

Tankless wins on lifespan, space, and endless hot water; tanks win on lower upfront cost and simpler installation. Household size and gas availability matter too. We'll lay out both honestly for your home.

My water heater is leaking — what do I do right now?

Turn off the unit's water supply (the valve above it) and its power or gas, then call us at (843) 790-6504. If water is spreading, shut off the house main as well.

Rainbow Row's pastel historic houses on East Bay Street in Charleston, South Carolina

Y’all deserve to be comfortable.

Schedule an appointment with us today — or call and talk to a real person, until 9 PM.