Tankless Water Heaters in Palm Coast, FL

How tankless works, and what it gives up

A tankless unit heats water only while a hot tap is open. Water passes through a heat exchanger, a burner or electric elements fire, and hot water comes out the other side. Nothing sits in a tank losing heat overnight, and the unit takes up a patch of wall instead of a corner of the floor.

The trade-off is that a tankless unit has a ceiling on how much hot water it can make at once. A tank stores 40 or 50 gallons for a rush; a tankless unit has to keep up in real time. Sizing it right is the whole job, and the next two sections show how.

Electric tankless: the amps come first

In a house without natural gas or propane, and 88% of Florida homes heat water with electricity according to the U.S. Energy Information Administration, tankless means electric. Electric units are rated in kilowatts, and the current they draw is simple arithmetic: amps = watts ÷ volts. At 240 volts:

For comparison, the label on a typical electric tank might read 4,500 watts, or 18.75 amps. A whole-house tankless unit asks for several times that, through multiple heavy circuits. Before anything else, the contractor has to confirm your panel and service can carry it alongside the air conditioning, range and dryer. If they can't, the price of a panel or service upgrade belongs in the comparison.

How much hot water you actually get

A standard rule of thumb: raising one gallon per minute of water by 1°F takes about 500 BTU per hour (a gallon weighs about 8.33 pounds, times 60 minutes). One kilowatt equals 3,412 BTU per hour. So the flow a unit can deliver depends on how much it has to raise the water's temperature.

The Department of Energy's sizing method says to assume 50°F incoming water unless you know otherwise, and to add up the flow of everything you'd run at once. The EPA notes that a standard showerhead uses 2.5 gallons per minute, while WaterSense-labeled heads use 2.0 or less. Two standard showers at once need 5 gpm, more than this unit makes at any of the three temperatures above. One shower plus a bathroom faucet is closer to its range. Ask the contractor to size for your coldest incoming water, not an average day.

Gas and propane tankless

Gas units deliver far more heat per unit than electric ones, which is why they're the usual whole-house choice where gas is available. In Flagler County that means a Peoples Gas line, where one reaches your street, or propane from a tank on the property. Either way, the job usually includes:

• Gas piping sized for the burner. A tankless burner can use far more gas at once than a tank did, so the line from the meter or regulator is checked and sometimes replaced.
• A vent of its own, through a wall or the roof, run to the maker's limits on length and bends. A unit that can't exhaust properly shuts itself down.
• Electricity. Gas tankless units need power for their controls and fan, so they don't make hot water during a power outage unless they're on backup power.

See gas and propane water heaters for supply and safety details.

Scale on Palm Coast water

The City of Palm Coast's 2025 water quality report lists total hardness of 100 parts per million, or 5.8 grains per gallon. On the scale published on the U.S. Geological Survey's website, 61 to 120 milligrams per liter counts as "moderately hard." Hardness minerals build up as scale inside a tankless heat exchanger, which cuts flow and can trigger error codes over time.

UF/IFAS Extension's water heater guide notes "some concern" about using tankless units, gas or electric, in hard-water areas, and says to check with the manufacturer. In practice, ask two things before buying: what the maker's manual says about water hardness for that model, and how often it calls for descaling. Plan for service valves on the unit so flushing is a routine job. See Palm Coast water.

What tankless costs

National figures, labeled as national: Angi (2025 data) lists $1,400 to $3,900 for a tankless water heater installed, with tankless replacement labor at $600 to $1,900 and labor to convert from a tank anywhere from $150 to $2,500. Thumbtack's 2026 guide gives an average range of $747 to $2,312 for tankless. Angi lists panel and gas work as extra costs: $500 to $1,000 for a new electrical line and sub-panel and $260 to $820 for gas line installation (2025 data), with no figure for a full service upgrade.

The federal energy efficient home improvement credit no longer helps here. The IRS instructions for Form 5695 say the credit is allowed for property placed in service through December 31, 2025.

When tankless fits, and when it doesn't

Tankless questions