Tankless Water Heater Installation and Repair on Long Island

• Error codes and shutdowns. Most units show a code for ignition failure, flame loss, overheating or a venting fault. The code tells the technician where to start.
• Scale in the heat exchanger. Mineral buildup reduces flow and heat transfer and can make the unit overheat and shut down.
• Clogged inlet filter. A small screen on the cold inlet catches debris. When it clogs, flow drops and the burner may not stay lit.
• Failed control board or wiring. Electronics run the burner, fan and sensors; a failed board or harness can stop the unit entirely, as in our Lindenhurst repair.
• Leaking or failed heat exchanger. Water inside the cabinet or a unit that fires but won't heat can point to the heat exchanger.
• Venting problems. Blocked or disconnected vent pipes stop the unit and can be a safety issue. Snow can also cover side-wall terminations; see high-efficiency equipment shutting off in the cold.
• Gas supply too small. A tankless burner needs far more gas at full fire than a tank. Undersized piping causes cold water when several taps run.

1. Look at the house. We check how many fixtures run at once, the gas meter and piping size, where the unit can mount, and the vent route to an outside wall or the roof.
2. Quote in writing. You get a written price for the unit and installation, or for the repair, before work starts.
3. Install. On a new installation we remove the old tank, mount the tankless unit, connect water with isolation valves for future descaling, connect gas and venting, and wire power for the controls.
4. Repair. On a repair we read the error history, test the sensors, burner, fan and board, check the inlet filter and look for scale or leaks, then replace what has failed.
5. Test. We run hot water at several fixtures, check temperature and flow, and show you the temperature setting and the descaling valves.

Water heater work can need local approval. K2 does not file town permits, so please confirm what your town requires before installation.

We don't post a single price for tankless work. You get a written quote after we see the house. What changes it:

• The unit. Flow rating, condensing or non-condensing, and indoor or outdoor models.
• Gas piping. Many homes need a larger gas line to the unit, and sometimes a meter change through the utility.
• Venting. Condensing units vent through PVC and need a condensate drain; others need stainless vent pipe. The route to outside matters.
• Removing the old heater. Taking out a tank, or replacing an existing tankless unit.
• Water treatment. A scale filter or softener where water is hard.
• Repairs. A board, sensor or heat exchanger is priced on its own, and warranty parts can change the labor-only cost.

A tankless unit with a failed board, sensor or valve is usually worth repairing, especially while the heat exchanger is still under the manufacturer's warranty. Replacement starts to make sense when the heat exchanger fails out of warranty on an older unit, parts are hard to get, or the unit has never kept up with the house.

Going back to a tank is a reasonable choice if the household uses less hot water than it once did or doesn't want the descaling routine. Our water heater repair and replacement page covers gas and electric tanks, and our post on heat pump water heaters covers another option. Financing is available through Rheem KwikComfort, with credit provided by Synchrony Bank, subject to credit approval. See financing for how it works.

Note any error code on the display; it saves time on the visit. Make sure the gas is on at other appliances and the unit has power. Check whether the problem happens at one tap or every tap, and whether it happens only when two fixtures run at once. If the unit is outside or vents out a side wall, look for snow or debris at the vent after a storm.

Don't open the sealed burner compartment or bypass any safety device. If you smell gas, leave the house and call the gas utility from outside. For other heating emergencies, see 24/7 emergency service.

Water heaters across Long Island: see water heater repair and replacement and the towns we serve.

Related services: gas line installation, boiler repair, oil-to-gas conversion and tune-ups.