Tankless Water Heaters near you

A storage water heater keeps a set volume hot and reheats it as it is drawn down, so it can deliver a large flow briefly and then needs recovery time. A tankless unit has no reserve at all: it can supply hot water indefinitely, but only up to the flow rate it can heat at that moment, which falls as the incoming water gets colder. Northern installations in winter therefore deliver less simultaneous flow than the same unit does in a warm climate.

The practical consequence is that the two fail their owners in opposite ways. A tank runs out during back-to-back showers and then recovers; a correctly sized tankless unit never runs out, but an undersized one cannot run a shower and a dishwasher at the same time without the temperature wavering. Which failure you would rather have is a genuine part of the decision.

Gas tankless units are the mainstream choice for heating a whole American house, and they are the category ENERGY STAR certifies for whole-home use. Electric tankless units avoid combustion, venting and gas piping entirely, but heating water instantly with electricity requires a very large electrical supply, so whole-house electric models often demand service capacity that an older panel cannot provide.

Point-of-use units are a different product solving a different problem. Installed close to a single fixture, they shorten the wait for hot water at a remote bathroom or a utility sink rather than serving the house. ENERGY STAR lists point-of-use water heaters separately from whole-home tankless gas models, and they are worth considering where the actual complaint is a long wait at one faucet rather than insufficient capacity overall.

ENERGY STAR sets out what an installer should establish during an in-home estimate: the optimal flow rate in gallons per minute for your home, whether the existing natural gas line is sufficient, whether electricity is available near the water heater for models with forced ventilation, and how the combustion gases will be vented. Those four items are the retrofit, and any quote given without a visit has skipped them.

Gas supply is the item that most often surprises owners. A tankless unit fires at a far higher input than the storage heater it replaces, and the existing gas line and meter were sized for the old appliance, so an upgraded line from the meter is a common requirement rather than an upsell. Venting is the second: a tankless unit is not simply connected to the flue the old tank shared, and the vent has to be the type the manufacturer specifies and routed to the outside accordingly. Condensing models additionally produce acidic condensate that needs a proper drain path.

Sizing is arithmetic, not a guess. ENERGY STAR publishes typical flow figures to work from — about 2.5 gallons per minute for a shower or bathtub, 3.3 for a clothes washer, 2.2 for a kitchen or bathroom sink and 1.3 for a dishwasher — and the unit must cover the fixtures a household genuinely runs at once, at the temperature rise your incoming water requires. ENERGY STAR also advises getting estimates in writing, asking for references, and confirming that the company will obtain a local permit where one is needed and understands local residential building codes.

A tankless unit pushes water through a narrow heat exchanger at high temperature, which is an efficient way to transfer heat and an efficient way to deposit mineral scale. On hard water, scale builds inside the exchanger and progressively reduces both output and efficiency, and left long enough it triggers error codes and shortens the appliance's life. Periodic flushing with a descaling solution through the service valves is the countermeasure, and it is why those isolation valves should be fitted at installation rather than added later.

The rest of the routine is quick: clean the inlet screen filter, check the venting run and its terminal outside for obstruction or damage, confirm the condensate drain on a condensing model is running freely, and have combustion checked as part of a professional service visit. Manufacturers generally tie warranty coverage to documented maintenance, so keeping the service records is worth the small effort.

Households on well water or notably hard municipal supply should expect to descale more often, and may find that treating the water ahead of the heater protects it better than treating the heater repeatedly.

Consumer water heaters sold in the United States must meet federal minimum efficiency standards. The Department of Energy notes that manufacturers have had to comply with its energy conservation standards for consumer water heaters since 1990, and its definitions treat instantaneous units as those holding no more than one gallon of water per 4,000 British thermal units per hour of input, with gas instantaneous water heaters covered up to an input of 200,000 British thermal units per hour. Those standards set the floor for what may legally be sold, not what is best for a given house.

The regulatory picture for this specific product has moved recently, and it is worth knowing rather than guessing at. DOE published a final rule amending energy conservation standards for gas-fired instantaneous water heaters in December 2024; that rule was subsequently delayed and then, under the Congressional Review Act, withdrawn as of May 20, 2025. The practical upshot for a homeowner replacing a unit now is to rely on the label and the specification in front of them rather than on expectations of a pending change.

ENERGY STAR certification sits above the federal floor: the specification covering whole-home gas tankless models requires products to meet minimum requirements for energy efficiency, hot water delivery, warranty period and safety. ENERGY STAR also runs a rebate finder, since incentives for efficient water heaters are typically offered by utilities and state programs by ZIP code rather than nationally, and they change from year to year — check what is current in your area before purchasing, and keep the receipt and the model documentation.

Installing a gas tankless water heater means gas piping and combustion venting, which is licensed work everywhere in the United States and inspected in most jurisdictions. ENERGY STAR's own guidance for hiring an installer includes confirming that the company will obtain a local permit if one is necessary and that it understands local residential building codes, which is a reasonable minimum standard to hold a contractor to.

The license itself is a state credential. California's C-36 plumbing classification, as the Contractors State License Board defines it, expressly includes piping, storage tanks and venting for a safe and adequate supply of gases and liquids as well as water supply and waste disposal. Washington certifies individual plumbers, and its journey level certification covers water heaters among the systems a certified plumber may install. Some states and cities license gas fitting separately again, so ask which credential covers the gas connection specifically.

The model plumbing code applied to the installation also varies by state: Washington adopts and amends the Uniform Plumbing Code by rule, while Utah's construction code statute adopts the International Plumbing Code. Combined with the manufacturer's installation instructions, which inspectors do read, this is why a tankless installation is worth permitting properly rather than treating as an appliance swap.

LokalMatch lets a homeowner set out the job once — what is being replaced, whether the fuel is gas or electric, where the unit would go and how many fixtures need hot water at the same time — after which plumbers covering that area get in touch. Those pros pay for the requests they receive. LokalMatch does not install water heaters, does not set what any installer charges, and does not vet, rank or recommend the businesses that respond, so compare the quotes and confirm the licensing yourself.