GallonGaugeGallons, first-hour rating and GPM — the three numbers that decide it.

How much does a water heater replacement cost in Mount Pleasant, SC?

A gas tankless water heater installation in Mount Pleasant, SC
$3,378
endless hot water, and usually a gas line and venting upgrade with it · typical range $2,282 – $5,478
Typical totalinstalled, tankless gas$3,378
Range you should see in bidsthree bids on the same scope normally land inside this$2,282 – $5,478
Labor portion45% of the job — this is the part that moves by city$1,520
Material portion55% — bought at national prices$1,858
Plumbers, Pipefitters, and Steamfitters pay near Mount Pleasantabout $28/hr · Charleston-North Charleston, SC metro$58,210/yr
U.S. mean for the same tradeSOC 47-2152$72,170/yr
Versus the national pricetrade pay here runs −19.3% against the U.S. mean−$322

Notes

  • Where the number comes from. The national price for a gas tankless water heater installation is $3,700 installed — water heater replacement pricing published for 2026, unit plus installation. Labor is about 45% of that. Plumbers, Pipefitters, and Steamfitters near Mount Pleasant, SC average $58,210 a year against a U.S. mean of $72,170 — a factor of 0.807 — so the labor half is scaled by that and the material half is not. Source: BLS OEWS May 2025 for the Charleston-North Charleston, SC metro area, SOC 47-2152.
  • Why the city matters, not just the state. Trade pay moves inside a state as much as it does between states. Crews do not commute across a state to bid a job, and materials ship at national prices either way — so a metro wage is the honest input here and a state average quietly rounds four different cities into one number.
  • What is in the price: the heater, removal and disposal of the old one, new flex connectors, a drain pan, an expansion tank where code requires it, and labor.
  • What is not: a gas line upsize, new venting, an electrical circuit for an electric unit, and bringing an old install up to current code. These are the lines that turn a $3,378 quote into a $4,222 invoice, so ask about each one before signing.
  • Use this as a bid check, not a quote. It prices an average job in average condition. Difficult access, the state of what is being replaced, the season, and a crew booked out three months all move the real number, and none of them are in a national average for the job.

a gas tankless water heater installation in Mount Pleasant, SC

$3,378 is the typical number, and three bids on the same scope normally land between $2,282 and $5,478.

That is $322 less than the same job priced at the national average.

Why the city changes the number

About 45% of this job is labor — $1,520 of the $3,378 above. Labor is the only part that moves locally; a bundle of material costs what it costs wherever it is nailed down.

Plumbers, Pipefitters, and Steamfitters near Mount Pleasant average $58,210 a year, against a U.S. mean of $72,170. That is a factor of 0.807, so the labor half is scaled by it and the material half is not.

Source: BLS OEWS May 2025 for the Charleston-North Charleston, SC metro area, SOC 47-2152.

What the quote should include

The lines that turn a quote into an invoice

Ask about each of them before you sign. On a job this size they are the difference between $3,378 and something a quarter higher.

Use it as a bid check, not a quote

This prices an average job in average condition. Access, the state of what is being replaced, the season, and a crew booked out three months all move the real number, and none of them are in a national average.

If a bid lands outside $2,282 – $5,478, that is not automatically wrong — but it is the question worth asking out loud.

Nearby sizes

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