Tankless water heaters are on-demand systems that heat water as it flows through the unit instead of maintaining a heated reservoir, eliminating tank-related leaks, reducing standby energy loss, and providing continuous hot water at the rated flow capacity.
Two kinds of homeowners call us about tankless. The first just had their tank fail and is considering upgrading rather than dropping another 12-year tank in the same closet. The second is doing a renovation and wants to free up the garage corner where the old 50-gallon used to live. Both groups end up with the same questions. Will it actually deliver enough hot water for the family. Does the gas line need to be upsized. What about descaling. We walk through all of it on-site and quote both the tankless and the equivalent tank replacement so the comparison is honest.
Two Florida factors make tankless attractive. The climate is mild, so incoming water temperature is high (around 72°F average) compared to northern climates, and tankless units rated at a given flow can actually deliver that flow because the temperature rise is small. The other factor is hard water, which kills tank heaters by scaling the bottom but is more manageable in tankless units because they can be descaled annually with a vinegar flush. The trade-off is the up-front cost (gas tankless runs $3,200 to $6,500 installed) and the gas line sizing, since most existing residential lines are sized for the original tank and need an upgrade for the higher BTU draw of a tankless.
The most common reason people call about tankless is replacing an aging tank with one. The job involves removing the old tank, adding (and usually upsizing) the gas supply line for the higher BTU demand, running a dedicated vent to the exterior, adding a 120V electrical outlet for the unit's controls, and tying into the existing hot and cold water lines. A typical conversion is a 4 to 8 hour install. We pull the permit and coordinate the inspection.
Tankless units need an annual descaling flush. Hard water builds calcium and scale in the heat exchanger over the year, and untreated buildup eventually drops flow and triggers error codes. The flush takes about 45 minutes with a recirculation pump and a gallon of food-grade vinegar. We do annual descaling visits and maintenance contracts for vacation rental owners who do not want to think about it.
Tankless units display error codes when something is off. Code 11 (no ignition), code 12 (flame failure), code 14 (overheating), code 29 (heat exchanger leak). Each code maps to a specific diagnostic path. We carry the manuals and parts for the common brands (Rinnai, Navien, Bosch, Rheem) and can usually resolve a code call in one visit.
Tankless units are rated by GPM (gallons per minute) at a given temperature rise. A house with two showers running simultaneously needs at least 6 to 7 GPM in Florida's climate. Undersized units throttle when demand exceeds capacity, leading to cold-water-sandwich complaints. We size based on actual fixture count and typical simultaneous usage, not on the broker's default suggestion.
| Gas tankless | High-efficiency tank | |
|---|---|---|
| Lifespan | 20+ years | 10–12 years |
| Install cost | $3,200–$6,500 | $1,400–$2,400 |
| Operating cost (gas) | Low (no standby loss) | Moderate |
| Footprint | Wall-mount, no floor space | 50–80 gal tank space |
| Endless hot water | Yes, at rated flow | No, limited by tank size |
| Job | Typical range |
|---|---|
| Tankless repair / error code call | $195–$495 |
| Annual descaling flush | $165–$295 |
| Gas tankless install (drop-in) | $2,800–$4,500 |
| Gas tankless install (full conversion) | $3,800–$6,500 |
| Electric tankless install (whole-house) | $1,800–$3,500 |
Ballpark Orlando-area ranges. Your exact price depends on the job, and we give a firm, free quote before any work starts.
FBC-FG 401-411 and NFPA 54 govern gas-fired tankless installs; FBC-P 504 covers all water heater requirements. Tankless units need a permit in Orange County and most municipalities. Direct-vent and concentric venting per FBC-FG 503 must run to an exterior termination with proper clearances.
A gas tankless install runs $2,200 to $5,700 in the Orlando metro for 2026, with $3,750 as the typical median for a Rinnai or Navien unit on an existing gas line. The unit itself is $1,200 to $3,500; labor and venting are $1,000 to $2,200. Electrical tankless (whole-house) is $1,800 to $3,500 including upgraded breaker.
Permit issuance in Orange County is 2 to 5 business days. The install itself runs 4 to 8 hours including venting, gas-line sizing, and condensate routing. Final inspection is 1 to 3 business days post-install.
We install Rinnai RU199i / RUR199i (199,000 BTU, 11.1 GPM), Navien NPE-240A2 / NPE-S2 (199,900 BTU, 11.2 GPM), Rheem RTGH-95DVLN (8.4 GPM), and Noritz NRC1111-DV. Electric tankless: Stiebel Eltron Tempra Plus and Eemax HomeAdvantage II.
Renovation-driven tankless conversion concentrates in 32789 (Winter Park), 32803 (College Park), 32801 (downtown lofts), 32814 (Baldwin Park), and 32806 (SoDo). Whole-house electric tankless in all-electric ZIPs: 32825, 32828, 32837.
Call (407) 964-8940 for a free on-site quote. We size for your actual usage, walk through the gas-line and venting requirements, and quote both the tankless and the equivalent tank replacement.
Tankless installs almost always involve gas line work to upsize the supply, and may pair with tank water heater service if the homeowner ends up deciding to stick with a tank for budget reasons. Common in Winter Park and Lake Mary renovations.
It depends on the model and the incoming water temperature. In Florida, a 7 GPM gas unit comfortably handles two simultaneous showers plus the kitchen sink. A 9 to 11 GPM unit handles a 4-bathroom house. Undersizing is the #1 install mistake; we always size by actual fixture demand.
Usually yes. Most existing residential gas lines were sized for a 40,000 BTU tank, and a tankless runs 150,000 to 199,000 BTU. We size the line during the quote and include the upsize in the price if it is needed.
It is the brief slug of cold water that comes through when you turn the hot back on right after turning it off (within a minute or two). The water that was sitting in the pipe between the tankless and the fixture is cold. It is a feature of tankless, not a defect. Recirculation pumps eliminate it for owners who care.
Annual descaling. The flush takes 45 minutes and prevents scale buildup that drops flow and triggers error codes. Skipping it for several years can damage the heat exchanger and shorten the unit life.
Marginally. Whole-house electric tankless units need 200 amps or more of dedicated electrical service, which most older homes do not have. Point-of-use electric tankless (under a sink) is great for remote bathrooms. Whole-house, gas is the practical answer for most Florida homes.
The Florida permit code says no. It is gas and electrical work that needs to be done by licensed trades under permit, with inspection. DIY installs void your manufacturer warranty and create liability if anything happens later.
20 plus years with annual descaling. Without maintenance, expect 12 to 15 years. Tank heaters in Florida last 8 to 12 years, so the tankless lifetime advantage is real if you stay in the house.
Most quality gas tankless brands offer 15 year heat exchanger warranties and 5 year parts. Some require annual maintenance documentation to honor the warranty, so keep the descaling receipts.
Yes. Tankless units modulate output to match flow and target temperature, so the shower stays at the temperature you set even as flow varies. Tank heaters do not modulate, so you can sometimes get a stratified-temperature surprise toward the end of a long shower.
Our team is available around the clock to better assist you. Call now for fast, friendly help.
We work across eight regions of Greater Orlando. Reasons the service matters change by neighborhood, county, and home era.
Inner-ring renovations are the most common driver of tankless conversion in older Orlando neighborhoods. Smaller homes benefit from the wall-mount space savings.
Downtown Orlando, Thornton Park, College Park, Audubon Park, Baldwin Park, Delaney Park, Parramore, and Fairview Shores
Lake Nona was built with natural gas infrastructure throughout the master plan, making tankless conversions straightforward. Older Conway and Belle Isle homes need gas-line work to support tankless capacity.
Lake Nona, Waterford Lakes, Avalon Park, Alafaya, Azalea Park, Rio Pinar, Union Park, Conway, Belle Isle, Pine Castle, Sky Lake, Hunters Creek, Meadow Woods, Williamsburg, and Lake Buena Vista
Doctor Phillips and Windermere upscale homes are early adopters of premium tankless units, often paired with whole-house water softeners. MetroWest townhome and condo associations occasionally have shared gas tankless systems.
Pine Hills, MetroWest, Doctor Phillips, Windermere, and Goldenrod
Apopka and Maitland renovation projects are common drivers of tankless installs. Rural east Orange properties on LP propane sometimes use tankless to reduce propane tank size requirements.
Apopka, Maitland, Winter Park, Ocoee, Winter Garden, Oakland, Gotha, Zellwood, Clarcona, Bithlo, Wedgefield, and Christmas
Lake Mary and Heathrow new construction and high-end renovations frequently spec tankless. Sanford older homes need gas-line capacity upgrades alongside the install.
Sanford, Lake Mary, Heathrow, Longwood, Altamonte Springs, Casselberry, Fern Park, Forest City, Wekiwa Springs, Winter Springs, Oviedo, Geneva, and Lake Monroe (community)
Tankless adoption in Volusia is slower than the Orange-Seminole metro, but DeBary lakefront and Deltona renovations increasingly include conversions.
DeBary, Deltona, Orange City, Enterprise, Osteen, DeLand, and Cassadaga
Clermont newer homes built with natural gas infrastructure are good candidates for tankless. Mount Dora, Eustis historic-district homes need gas-line and venting work for conversion.
Eustis, Tavares, Mount Dora, Sorrento, Montverde, and Clermont
Vacation rental properties benefit greatly from tankless because the endless hot water removes guest complaints about running out mid-stay. Celebration's natural gas infrastructure supports tankless throughout.
Kissimmee, Saint Cloud, Buenaventura Lakes, Poinciana, Intercession City, Davenport, Four Corners, Reunion, and Celebration
A few of the communities we serve. View all →