Your 10-year-old water heater is making that noise again. You know it’s time.
You’ve heard tankless systems save energy and never run out of hot water. But now you’re stuck on the bigger question: propane or electric? It’s not simple. Your home’s electrical capacity, gas line availability, family size, and even Florida’s coastal climate all factor in. Choose wrong, and you’re facing expensive upgrades, inadequate hot water, or regret that lasts 20 years.
Here’s what you need to know about propane tankless water heaters versus electric models—and which one makes sense for your Brevard County, FL home.
How These On-Demand Systems Heat Your Water
Both systems heat water on demand instead of storing it. That’s where the similarities end.
A propane tankless water heater fires up a gas burner when you turn on hot water. Cold water flows through a heat exchanger where the burner rapidly heats it to your set temperature. The system adjusts the flame based on how much water you’re using, giving you consistent temperature whether you’re running one shower or three. These units deliver 5 to 10 gallons per minute and work independently of your electrical system beyond a small amount of power for ignition.
Electric tankless systems use high-powered heating elements that kick on when water flows through. They’re mechanically simpler—no combustion, no venting, no gas lines. But they demand serious electrical capacity. A whole-house electric unit typically needs 100 to 150 amps of dedicated power, which eats up a big chunk of a standard 200-amp panel. Flow rates usually top out around 2 to 8 gallons per minute.
Here’s the Florida advantage: incoming water in Brevard County, FL sits around 70 to 75 degrees year-round. Both systems benefit because they don’t have to heat water from 40 degrees like northern climates do. That means a smaller unit can often handle your household compared to what you’d need up north.
Why Gas-Powered Systems Dominate in Florida Homes
Propane and natural gas tankless systems handle high demand better, and Florida families notice the difference fast.
Picture this: two showers running at 2.5 gallons per minute each, plus a dishwasher at 1.5 GPM. That’s 6.5 gallons per minute total. A properly sized instant gas hot water system rated at 8 to 10 GPM handles this without temperature drops. The burner adjusts output in real time, keeping your set temperature across all fixtures.
These systems also handle our coastal conditions better than you’d expect. The key is choosing units with corrosion-resistant heat exchangers and mounting them away from direct salt air. Outdoor models designed for coastal areas include protective coatings and stainless steel components built for our environment.
Installation requires a gas line sized right—usually 3/4-inch for whole-house units. Your existing line from an old tank heater probably won’t cut it. You’ll also need proper venting to exhaust combustion gases safely. Condensing models capture heat from exhaust and need a condensate drain, but they hit 93 to 96 percent efficiency. That translates to lower propane costs month after month.
The biggest Florida advantage? These work during power outages. When hurricanes knock out electricity for days, a gas tankless with battery backup keeps delivering hot water. In Brevard County, FL, that’s not a minor consideration.
Operating costs typically run $200 to $400 annually depending on usage. Propane costs less per BTU than electricity in most areas, and higher efficiency means more hot water per dollar.
What Electric Models Actually Deliver (and What They Don’t)
Electric tankless water heaters look appealing—no gas lines, no venting, compact installation. But the electrical demands create limitations that surprise homeowners.
A whole-house electric unit rated at 24 kilowatts draws 100 amps at 240 volts. That’s roughly half the capacity of a standard 200-amp panel. Most Brevard County, FL homes built before 2000 have 100 to 150-amp service. Translation: you need a full electrical panel upgrade before installation. That upgrade runs $1,000 to $3,000 depending on your setup.
Even with enough power, flow rates lag behind gas. Electric models max out at 2 to 5 GPM for whole-house applications here. That works fine for smaller households or one-bathroom homes. But teenagers taking back-to-back showers while someone runs laundry? You’ll notice the limitations.
The upside is straightforward installation if your electrical system can handle it. No gas line work, no venting, no combustion air requirements. These units mount anywhere with water lines and electrical supply. They’re also smaller and lighter, making them ideal for tight spaces.
Maintenance is minimal. No burners to clean, no venting to inspect. You’ll still need annual descaling because of our hard water, but that’s it. Heating elements last 10 to 15 years typically.
The efficiency rating hits 98 to 99 percent because all electrical energy converts directly to heat. But operating expenses typically run higher than gas for families with significant hot water needs—expect $400 to $600 annually. For smaller households using 41 gallons or less daily, instantaneous electric hot water systems can be 24 to 34 percent more efficient than traditional tanks.
Point-of-use electric heaters make more sense than whole-house systems in many Florida homes. Install a small unit under a bathroom sink or near a shower. These draw 20 to 40 amps and cost $200 to $400, making them practical additions without major electrical work.
What Installation Actually Involves in Brevard County, FL
Installation complexity and cost vary dramatically between propane and electric systems. Understanding what’s involved helps you budget accurately.
Propane installations need adequate gas supply, proper venting, a small amount of electrical power, and compliance with Florida building codes. A licensed plumber and gas fitter handle it—not a DIY project. Installation takes four to eight hours for straightforward replacements, longer if you’re converting from electric or upgrading gas lines.
Electric installations require sufficient electrical capacity, proper breaker sizing, and code-compliant wiring. If your panel can handle the load, installation is simpler. But that’s a big if. Many homes need electrical upgrades first.
Both systems need professional sizing based on your peak hot water demand. Undersizing is the most common mistake, leading to temperature fluctuations when multiple fixtures run simultaneously. A qualified contractor calculates your GPM requirements based on fixture count and usage patterns.
Gas Line Sizing and Venting That Actually Works
Getting gas supply right determines whether your continuous flow hot water system performs properly or disappoints you daily.
Most whole-house propane tankless heaters need 150,000 to 199,000 BTU per hour at peak demand. Your existing 1/2-inch gas line won’t deliver that. You’ll need 3/4-inch or larger depending on the unit and distance from your tank. Undersized lines cause the burner to cycle on and off, creating temperature swings and premature wear.
If you’re on propane, your tank needs adequate capacity. A 100-pound tank that worked for your old heater might struggle with a high-output tankless system. Many homeowners upgrade to 250 or 500-pound tanks during installation.
Venting depends on whether you choose condensing or non-condensing. Non-condensing units exhaust hot gases at 300 to 500 degrees, requiring stainless steel venting. Condensing models cool exhaust to 100 to 150 degrees, allowing PVC venting that costs less and routes easier through walls.
Indoor installations need proper combustion air. The unit pulls air from your home or through a dedicated intake pipe. Coastal homes benefit from sealed systems that draw air from outside, keeping salt-laden air away from internal components.
Outdoor installations simplify venting since exhaust disperses directly. But Florida’s coastal environment requires units rated for outdoor use with protective coatings. You’ll also want protection from direct sun and driving rain. Many homeowners install units under eaves or in recessed alcoves.
Condensing models produce acidic condensate needing proper drainage. A simple drain line to a floor drain or exterior handles it. But it’s an additional requirement non-condensing units don’t have.
Florida building codes require permits for gas appliance installations. Your contractor pulls permits and schedules inspections to verify proper installation. This protects you and ensures work meets safety standards. Skip permits? That’s a red flag.
Electrical Capacity That Makes or Breaks Electric Installations
Electric installations depend entirely on your home’s electrical capacity. Before you commit to electric, verify your panel can handle it.
A 24-kilowatt whole-house unit draws 100 amps continuously when running. Not a startup surge—constant draw whenever hot water flows. Your panel needs 100 amps available that you’re not using for anything else during peak demand.
Most electricians recommend at least 200-amp service for whole-house electric tankless. Running a 100 or 150-amp panel? You’re looking at a service upgrade. That means new panel, new meter base, utility coordination, permits, inspections, and typically $1,500 to $3,000 before water heater installation even begins.
Even with 200-amp service, you need to calculate existing loads. Central AC, electric range, electric dryer, and other major appliances all draw power. When your AC kicks on while someone’s showering, you’re pulling serious amperage. Load calculations determine whether your panel has room.
Wiring requires appropriately sized conductors—typically 2 AWG copper for a 100-amp, 240-volt circuit. The wire runs from your panel to the heater, which might be 50 to 100 feet. Longer runs require heavier wire. Copper prices make this expensive.
Point-of-use electric heaters offer a practical alternative. A small unit serving one bathroom draws 20 to 40 amps—manageable within most existing systems. You can install multiple point-of-use heaters for less total demand than one whole-house unit. This works well for Brevard County, FL homes with limited electrical capacity.
Installation permits apply to electrical work just like gas. Licensed electricians pull permits for panel upgrades and new circuits. Inspections verify proper sizing and code compliance.
Bottom line: get an electrician to evaluate your panel before committing. That $500 unit price looks different when you’re adding $2,000 for electrical upgrades.
Choosing the Right System for Your Home
There’s no universal winner. The right choice depends on your home’s infrastructure, your family’s hot water needs, and your budget for installation and operation.
Propane tankless systems deliver higher flow rates, handle simultaneous usage better, and typically cost less to operate. They make sense for larger families, homes with multiple bathrooms, and situations where you already have gas service. The higher upfront cost pays back through lower operating expenses over 20-plus years.
Electric tankless heaters work well for smaller households, point-of-use applications, or homes where running gas lines isn’t practical. Just verify your electrical system can handle the load first. For many Brevard County, FL homes, multiple point-of-use electric units make more sense than one whole-house system.
Both systems benefit from Florida’s warm incoming water and deliver significant energy savings compared to traditional tanks. The key is proper sizing, professional installation, and realistic expectations.
If you’re ready to explore which system fits your home, we bring 45-plus years of experience installing tankless water heaters throughout Brevard County, FL. We evaluate your home’s specific requirements, explain your options clearly, and handle everything from gas lines and venting to electrical work—no finger-pointing between trades.
