The tankless needs a service: what the water and the display are telling you
Most callers describe the same few things. The shower goes cold for a minute, the display flashes a code, or nothing heats at all. The symptom usually narrows the cause before anyone opens the cover.
Write down the code and the model number before you call. Codes differ by brand, and the manual in the unit's box or on the maker's site decodes them.
| What you notice | Likely cause | Who fixes it |
|---|---|---|
| No hot water, display dark | Power off, tripped breaker, or a failed control board | Check the breaker, then call a plumber |
| No hot water, display on, burner will not light | Gas supply, a closed gas valve, ignition fault or gas valve | Plumber. Never test gas yourself |
| Error code appears | Flame sensor, vent, scale or a clogged inlet filter | Check the manual, then call |
| Hot water, then a cold burst, then hot again | Flow too low for the unit, or a mixing valve on a fixture | Plumber to test the flow and the fixtures |
| Water only warm, flow weak | Dirty inlet screen or scale on the heat exchanger | Flush and clean the screen |
What to check first
These checks sit within reach of any homeowner and do not require opening the unit.
- Power: confirm the unit has power and the breaker has not tripped. Gas models also need electricity to run the fan and control board.
- Gas valve: if you have a gas model, confirm the shutoff is in line with the pipe. If you smell gas, leave and call 911 first.
- Display code: photograph it before resetting anything.
- Inlet screen: if the maker's manual shows a user-accessible filter, check it once the water is shut off.
- Flow: if hot water only fails when two fixtures run, the unit may be at its flow limit.
- Date: note when it was last serviced and when it was installed.
Is tankless right for a Dania Beach home?
The Department of Energy says tankless units last more than 20 years, against 10 to 15 years for a storage tank. DOE also finds demand-type heaters 24 to 34 percent more energy efficient for homes that use about 41 gallons of hot water a day or less, and 8 to 14 percent more efficient at about 86 gallons a day.
Typical flow is 2 to 5 gallons per minute, so one unit can run one or two showers, not four fixtures at once. DOE did not study Florida's warm inlet water, so we do not promise a number for your bill.
If the choice is a tankless or a new tank, water heater replacement covers the tank side, and the comparison depends on gas supply, space and how many people shower in the morning.
Installing a tankless unit: gas pipe, vent, and power
A tankless gas unit fires at a much higher rate than a tank burner for a short time. That usually means a larger gas pipe than the old tank used, and the pipe size has to match the unit's input listed in its manual.
The other changes are the vent, a drain for condensate on high-efficiency models, and a nearby outlet. The permit paperwork follows the same Broward water heater process as a tank, so the Dania Beach Building Division is the place to ask about your address.
- Gas pipe sized for the unit's maximum input, checked against the meter capacity.
- Stainless or PVC vent per model, with the right termination clearances.
- Condensate drain line for condensing models.
- A grounded outlet or hardwired circuit for the fan and control board.
- Isolation valves with a purge port on the hot and cold lines for flushing.
- Pressure relief and expansion control where the unit and the plumbing require it.
Flush and descale: follow the manufacturer's manual
Flushing means circulating a descaling solution, often white vinegar, through the heat exchanger with a small pump and two hoses. It clears mineral buildup that can limit flow and heat.
The City of Dania Beach softens its water with lime softening and nanofiltration, so we do not assume heavy scale. How often to flush depends on the maker's manual and the water at your tap, so we follow the manual and look at what comes out. If you have a softener, filter or well, tell us.
A tankless unit that has not been flushed for years can clog its screens or exchanger. This is not a repair emergency, but it is better to schedule a service than wait for an error code.
Repair or replace a tankless unit
National published guides put tankless repair at about $100 to $1,300. A failed igniter, flame sensor or inlet screen is a small job. A cracked heat exchanger or a dead control board on an older unit can cost much more.
Because a unit that lasts 20 years is still pricey to replace, we test before we talk about swapping it. If the failure is minor, water heater repair covers the process. If the exchanger is gone, we explain the replacement options in plain terms.
How a flush and service visit runs
A service call on a tankless unit is quicker than a tank swap and follows the maker's steps.
- Turn off power, close the gas and water, and read the error history.
- Attach the pump and hoses to the isolation valves and circulate the solution for the time the manual lists.
- Rinse with clean water, then clean the inlet screen.
- Check the vent, the condensate line and the burner or elements.
- Restore power and gas, run hot water at two taps, and check the display and the flow.
Power outages and hurricane season
Even a gas tankless heater needs electricity for its fan and control board. When power drops in a storm, a tankless unit goes cold, while a tank full of already-heated water keeps some hot water for a while.
Hurricane season runs June 1 to November 30. If outages concern you, ask about a battery backup for the unit or a small generator, and weigh that against a tank. Flood-prone closets also matter, since a unit mounted on a wall sits higher than a tank on the floor.
What a tankless water heater costs
National published guides put an installed tankless water heater at about $1,000 to $3,900, and tankless repair at about $100 to $1,300. Florida prices vary by gas line work, vent type and unit size.
A tankless unit usually costs more to install than a storage tank because of the gas pipe, the vent and the isolation valves.
What moves the price
- Gas line size. A small existing pipe may need to be replaced to feed the unit's higher input.
- Venting. Condensing models vent with PVC and need a condensate drain. Non-condensing models need stainless venting.
- Unit capacity. More fixtures at once means a larger unit with a higher flow rating.
- Location. Indoor, garage and exterior installs have different venting and weather exposure.
- Service history. A unit with a steady flush record is easier to diagnose than one that has never been touched.
| Work | Published range |
|---|---|
| Tankless water heater, installed (national) | $1,000 to $3,900 |
| Tankless water heater repair (national) | $100 to $1,300 |
Planned installs and routine flushing are not covered by homeowners insurance. If a tankless unit or its fittings leak and damage floors, a claim may apply for sudden damage, but gradual leaks are treated differently. Policies differ, so read yours or ask your insurer.
The unit, gas supply and venting decide the price. Call (954) 697-4920 and describe the symptom or the plan for a real number.
Frequently Asked Questions
Why is my tankless water heater not heating in Dania, FL?
Common causes are no power, a closed gas valve, an ignition fault, a dirty inlet screen or scale on the exchanger. The display code usually points to the cause. Write it down, and call us if the problem remains after you check power and gas.
How often should a tankless water heater be flushed?
That depends on the maker's manual and the water at your tap. We do not use a fixed interval from another city. Check the manual, and ask us if you have a softener, a filter or a well.
Does Dania Beach have hard water?
The city softens its supply with lime softening and nanofiltration, but the city's water quality report lists no hardness number. If you want to know, test your tap or ask the City of Dania Beach water utility.
How long does a tankless water heater last?
The Department of Energy says most last more than 20 years, compared with 10 to 15 years for a storage tank, and that maintenance extends life. Those are national figures, not a promise for your unit.
Can a tankless heater run two showers at once?
Usually one or two, depending on the unit. DOE puts typical flow at 2 to 5 gallons per minute, and a larger unit raises the limit. We size the unit to your fixtures. See water heater installation for the planning steps.
I manage several units. Can you service a tankless heater in each?
Yes. Send the addresses and the make of each unit. We also serve Davie and other nearby towns. Call (954) 697-4920 to schedule a round of flushes.
Code reference: plumbing work in Florida falls under the Florida Building Code, Plumbing (8th Edition, 2023), which is based on the 2021 International Plumbing Code (IPC). Ask the Dania Beach Building Division whether your job needs a permit.