Tankless Water Heater
Tankless Water Heater | Tankless Water Heater Install | Plumbing | Charleston
Imagine stepping into a shower that never runs cold, even after the whole family has rinsed off the sand from Sullivan’s Island. HEP’s master plumbers specialize in crafting that experience with a seamless tankless water heater install, giving Charleston homeowners endless hot water, up to 40% energy savings, and precious space reclaimed from bulky tanks. Our team arrives on time, protects your home like it’s our own, and calibrates your new unit to perform flawlessly in the Lowcountry’s unique humidity and mineral-rich water.
From historic downtown cottages to modern builds on Daniel Island, we combine local know-how with industry-leading warranties, transparent pricing, and 24/7 support. Choose HEP to future-proof your comfort, lower your utility bills, and add immediate value to your property—then pour yourself a sweet tea while we handle every detail. Ready to feel the difference? Schedule your tankless upgrade today and discover why neighbors across Charleston say, “Happy HEP, happy home!”
FAQs
What advantages does a tankless water heater offer over a conventional storage tank in Charleston?
A tankless water heater heats water only when you open a hot-water tap, so it eliminates standby heat loss and can cut energy consumption by 25–40 %. Because Charleston’s incoming water temperatures are moderate year-round, most units can deliver a steady 2.5–6 gpm of hot water without the large storage tank. You also regain 10–20 ft² of floor space, enjoy virtually unlimited hot water for back-to-back showers, and gain equipment that typically lasts 18–20 years—almost double that of a tank-style heater.
How do I choose the correct size (flow rate) tankless water heater for my home?
Sizing is based on simultaneous demand in gallons per minute (GPM) and the required temperature rise. 1) Count the fixtures you might run at once (shower ≈2.0 gpm, kitchen sink ≈1.5 gpm, washing machine ≈2.0 gpm). 2) Add those flows to get peak GPM. 3) Charleston’s groundwater temperature averages 67 °F, so a 53 °F rise delivers 120 °F hot water. Most whole-home gas units rated 7–10 gpm at this rise are sufficient for a three-bath house. Our technicians will perform the calculation on-site and recommend a model that matches your specific usage and fuel type (natural gas, propane, or electric).
Do I need a permit or city inspection to install a tankless water heater in Charleston?
Yes. The City of Charleston and Charleston County both require a plumbing permit and, for gas units, a separate mechanical/gas permit. After installation, a city inspector must verify proper venting, combustion air, gas line sizing, and relief-valve termination. We handle the entire permitting process, schedule inspections, and provide you with final approval paperwork for your records.
Will my existing gas, electric, or venting infrastructure work with a new tankless unit?
Often, upgrades are needed. Gas models may require a ¾-inch gas line and up to 199,000 BTU/hr capacity—higher than many tank heaters. Electric tankless units typically need multiple 40- to 50-amp breakers and #6 AWG wiring. Venting must be Category III/IV stainless steel or polypropylene concentric pipe that terminates outdoors. During our free assessment, we measure gas pressure, electrical panel load, and vent routes, then give you an upfront quote that includes any necessary modifications.
How does Charleston’s water quality affect maintenance of a tankless heater?
Charleston’s municipal water is slightly hard (≈4–7 grains per gallon). Minerals can accumulate on a tankless heat exchanger over time, reducing efficiency. We recommend: 1) installing a sediment pre-filter and, where hardness exceeds 6 gpg, a scale-control system; 2) performing an annual descaling flush with food-grade vinegar; and 3) scheduling a professional service every one to two years. Following these steps keeps your warranty valid and maintains peak performance.
What is the typical cost and installation timeline for a tankless water heater in Charleston?
Turn-key installation of a whole-home natural-gas tankless heater generally runs $3,200–$4,800, depending on capacity, venting length, and line upgrades; electric models range from $2,200–$3,200. The job is usually completed in one day: morning removal of the old tank, mid-day rough-in of new gas/electric and venting, afternoon mounting and commissioning, followed by the city inspection (often next business day). Homeowners may qualify for a federal 30 % tax credit (up to $600) and local SCE&G efficiency rebates, which we help process.