How a tankless heater makes hot water with no tank
When you open a hot tap, a flow sensor inside the unit feels the water moving. That signal tells the heater to fire a gas burner or switch on electric heating elements. Cold water passes through a heat exchanger, and hot water leaves the unit a few seconds later.
The U.S. Department of Energy (DOE) says these demand-type heaters usually deliver about 2 to 5 gallons per minute. That number matters because every shower, dishwasher and tap you run at the same time takes a share of it. A unit sized for one bathroom can struggle when a second shower and the washing machine start together.
When the tap closes, the heater shuts off. There is no stored hot water to keep warm, which is where the energy savings come from.
Gas or electric: which one can your Dania Beach home support?
Gas tankless units need a gas line large enough for the burner, plus a vent to carry exhaust outside. Many older gas heaters sit on a small gas pipe, so the line often has to be upsized. Electric units skip the vent but pull a large amount of power, so the panel needs a dedicated high-amperage circuit.
Which one you can use depends on what is already at your address, not on what you prefer. Ask yourself these questions first:
- Does the home have natural gas, or only electric service?
- Is the water heater closet or garage wall where a vent can reach the outside?
- Does the electrical panel have room for a large dedicated breaker?
- Is the current heater in a condo unit where the association controls venting and wall penetrations?
What Dania Beach Homeowners Should Know Before Going Tankless
Dania Beach runs its own public water system. The city's 2024 water quality report says it blends water from two city wells and the Broward County Regional Wellfield, treated with lime softening and nanofiltration, and disinfected with chlorine. The report does not publish a hardness number, so we will not guess one. Ask the city's water plant, or buy a cheap test kit, and read your heater's manual to see what it says about scale.
The Census Bureau's American Community Survey puts the median Dania Beach home at a 1977 build year, and about 12.4 percent of housing units are mobile homes. Older gas lines, tight closets and mobile home venting rules all shape a tankless job more than the heater brand does.
Peoples Gas lists Dania and Dania Beach among the Broward communities it serves, but gas is available street by street. Confirm service at your address before planning a gas unit. Water heater replacement is permitted work in Broward County, so ask the Dania Beach Building Division what your swap needs. If you live near our neighbors in Davie or West Park, their building departments have their own checklists, so do not assume the paperwork matches.
- City of Dania Beach 2024 water quality report
- U.S. Census Bureau ACS housing data
- Peoples Gas tariff service list
- Broward County Board Policy 22-02
Tankless vs tank: how the two compare
Figures below come from the DOE and from national cost guides. Florida prices vary, and your own quote will depend on gas, venting and permit work.
| Item | Tank heater | Tankless heater |
|---|---|---|
| Typical life (DOE) | 10 to 15 years | More than 20 years |
| Energy use (DOE) | Baseline | 24 to 34 percent more efficient at 41 gallons or less per day, 8 to 14 percent at about 86 gallons per day |
| Hot water flow | Draws from the stored tank | About 2 to 5 gallons per minute |
| Installed cost, national guides | About $600 to $2,500 (Angi) | About $1,000 to $3,900 (Angi, HomeAdvisor, Forbes, This Old House) |
| Floor space | Needs a tank footprint | Wall mounted, small |
| Common extra work | Expansion tank, drain pan | Gas line upsizing, new vent, larger circuit |
Will it keep up when two showers run at once?
That depends on the unit's rating and on the incoming water temperature. We cannot size a heater by phone, because the answer comes from counting your fixtures and their flow rates.
A rough check is easy to do. Add up what would run at the same time on your busiest morning, then compare it with the 2 to 5 gallon per minute range DOE gives. If the total is higher than the unit can supply, the water will turn lukewarm or the heater will cut out.
Some households fix this with a larger unit. Others install two smaller units, one for each bathroom group.
When a tankless heater is a poor fit
Tankless is not the right answer every time. DOE notes the savings shrink as a household uses more hot water, so a large family that runs hot water all day sees a smaller gain than a couple that uses a little.
- The gas line or panel upgrade costs more than the heater itself.
- There is no safe path for a vent in the existing closet.
- The old heater is fine and still has years left in its 10 to 15 year range.
- You want the lowest upfront price and plan to sell soon.
What to know before you call for a quote
A good estimate starts with facts you can gather in ten minutes. Write down the make and age on the current heater's label, whether it runs on gas or electric, and how many bathrooms you have.
Take a photo of the closet or garage wall around the heater. Note if the unit sits in a condo, a mobile home or a single-family house, because each has different venting and permit paperwork.
If your current heater is leaking or has no hot water at all, read our tankless water heater page or Call (954) 697-4920 and we will tell you what to look at first. For a straight swap with the same fuel type, our water heater installation service covers tank models too.
Frequently Asked Questions
Does the softened city water mean I can skip flushing a tankless heater in Dania Beach?
Not safely. The city softens its water with lime and nanofiltration, but its report publishes no hardness figure, so we cannot promise scale will never form. Follow the maintenance schedule in your heater's manual and ask us what we see inside units we open.
How long does a tankless water heater last?
The DOE says most tankless heaters have a life expectancy of more than 20 years, and that storage tank heaters usually last 10 to 15. Regular maintenance can add years to either type.
Can I put a tankless heater where my tank heater is now?
Sometimes. The old spot may need a new vent path, a bigger gas line or a larger breaker. We have to look at the closet before we can say yes.
Is a tankless heater worth it for one or two people?
DOE says the biggest efficiency gain, 24 to 34 percent, goes to homes using 41 gallons or less of hot water per day. Small households tend to see the best return.
Who do I call if my heater stops working at night?
Dania 24/7 Plumbing dispatches around the clock. Call (954) 697-4920, tell us the brand, any error code on the display, and whether it runs on gas or electric.
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.