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Tankless Water Heaters

Navien installed for $4,909 flat-rate. Endless hot water, 20-plus years of service life, and a unit the size of a suitcase.

Owner answers every call Flat-rate upfront pricing Same-day availability

Prestige Plumbing installs Navien tankless systems for $4,909 and Rinnai for $5,075, flat-rate. Converting from a tank, which adds gas line sizing, venting, and condensate work, runs $5,735. A tank holds 50 gallons and quits. A tankless unit heats on demand: back-to-back showers, the dishwasher, and the washer at once, for as long as you like.

Is tankless worth it?

Honest answer: not for everyone. The math works when your household outruns the tank, your tank is due for replacement anyway, or you want the garage space back. A tankless unit runs 20-plus years against 8 to 12 for a tank, so one tankless outlives two tanks while it stops reheating 50 gallons around the clock. If your current tank is young and keeps up, keep it. Matt will tell you which camp you're in before quoting a dime.

Own one already? Flush it yearly

Lowcountry hard water scales up heat exchangers, and skipping the annual descale voids most manufacturer warranties. The annual flush costs less than the heat exchanger it protects; the table below has the number. Error codes or cold-water sandwiches? A diagnostic visit names the problem fast. Pair the unit with whole-house filtration and scale stops being your problem at all.

Transparent pricing

Tankless water heaters: flat-rate prices

Tankless water heatersPrice
Navien tankless installation$4,909
Rinnai tankless installation$5,075
Tank-to-tankless conversion$5,735
Tankless recirculation system$1,235
Isolation valve kit$575
Tankless flush (descale)$340
Annual tankless maintenance$289
Tankless diagnostic$207

Flat-rate prices, current as of June 2026. Standard labor, testing, and cleanup included.

Questions

Tankless water heaters FAQs

How much does a tankless water heater cost installed?
$4,909 for Navien, $5,075 for Rinnai, flat-rate. A tank-to-tankless conversion costs $5,735 because it adds gas line sizing, venting, and condensate work. The quoted price is the final price.
How long do tankless water heaters last?
20 or more years with an annual flush. Tank heaters last 8 to 12. One tankless unit typically outlives two tanks.
Why does a tankless unit need an annual flush?
Mineral scale collects in the heat exchanger, cuts efficiency, and voids most manufacturer warranties when maintenance lapses. Lowcountry water is hard, which speeds it up. The flush costs $340.
Do you service tankless brands you did not install?
Yes. Diagnostics, descale flushes, and repairs on any tankless brand already on your wall.

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Tankless water heaters across the Lowcountry

Tankless water heaters in Bluffton · Tankless water heaters in Hilton Head Island · Tankless water heaters in Okatie · Tankless water heaters in Sun City Hilton Head · Tankless water heaters in Hardeeville · Tankless water heaters in Ridgeland

No hot water? Slow drain? Mystery leak?

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