What is a tankless water heater?
A tankless water heater is an on-demand water heater that heats water as it passes through a heat exchanger, with no storage tank.
A tankless water heater is one type of water heater, and its scale-sensitive heat exchanger needs a yearly descaling flush in hard-water areas such as Lancaster.
What are the 6 signs you need tankless water heater repair?
The 6 signs you need tankless water heater repair are listed below, from the most common to the least common.
- The unit shows an error code on the display.
- Hot water turns cold in the middle of a shower.
- The water never gets fully hot.
- The unit does not fire when a hot tap opens.
- Scale buildup lowers the hot water flow.
- Water leaks from the unit or the connections.
Seeing one of these signs? Call a local plumber now.
Call (607) 305-8020How does a plumber install a tankless water heater?
A plumber uses the 6 steps below to install a tankless water heater.
- Sizes the unit to the peak hot water flow of the house.
- Upgrades the gas line or the electric circuit when needed.
- Mounts the unit on the wall and installs the vent.
- Connects the water lines with isolation valves for flushing.
- Fires the unit and sets the temperature.
- Tests the flow at every hot water fixture.
How much does a tankless water heater cost in Lancaster, PA?
A tankless water heater in Lancaster, PA costs $1,400–$3,900 for the unit and installation, according to HomeAdvisor. Water heater repair costs $222–$990, with an average cost of $606.
Typical prices for 3 tankless water heater repair and installation jobs are shown in the table below.
| Job | Typical price |
|---|---|
| Tankless water heater, installed | $1,400–$3,900 |
| Water heater repair | $222–$990 |
| Tank water heater replacement | $882–$1,810 |
Source: HomeAdvisor national cost data, 2025–2026. Ranges are what most homeowners pay; your plumber gives the price for your job before work starts.
Want a price for your job? Call and describe the problem to a local plumber.
Call (607) 305-8020What is the difference between a tankless and a tank water heater?
The difference between a tankless and a tank water heater is the storage: a tankless unit heats water on demand, and a tank unit stores 30 to 80 gallons. A tankless unit lasts 20 years or more, and a tank unit lasts 6 to 15 years, according to HomeAdvisor. A tankless unit costs $1,400–$3,900 installed, and a tank unit costs $882–$1,810.
Related plumbing problems and next steps
When is a tankless water heater repair problem an emergency?
A tankless water heater repair problem is an emergency when water leaks from the unit or a gas smell comes from it. Close the gas and water valves and call a plumber. Emergency calls for tankless water heater repair problems go to an emergency plumber for Lancaster County homes.
What services are related to tankless water heater repair and installation?
The 4 services related to tankless water heater repair and installation are listed below.
- Water heater repair is the parent service, and the water heater repair in Lancaster, PA page covers it in full.
- Boiler repair signs, steps and prices are on the boiler repair in Lancaster page.
- Hot water runs out fast has 4 causes, listed in the hot water runs out fast guide.
- Tankless water heater not heating has 5 causes, listed in the tankless water heater not heating guide.
Frequently asked questions
How long does a tankless water heater last?
A tankless water heater lasts 20 years or more with yearly descaling, according to HomeAdvisor.
Does hard water damage a tankless water heater?
Yes, hard water damages a tankless water heater by coating the heat exchanger with scale. A yearly descaling flush removes the scale.