BTU demand calculator, CSST vs rigid pipe selector, FL permit guide — size your gas line right the first time
Natural Gas — 0.5" WC pressure drop, specific gravity 0.60
| Pipe Size | 10 ft | 50 ft | 100 ft | Max BTU |
|---|---|---|---|---|
| ½" | 172k | 95k | 66k | 172k BTU |
| ¾" | 360k | 199k | 138k | 360k BTU |
| 1" | 678k | 374k | 259k | 678k BTU |
| 1¼" | 1,290k | 714k | 494k | 1.29M BTU |
| 1½" | 1,960k | 1,080k | 748k | 1.96M BTU |
Calculate total simultaneous gas demand for all appliances
Most popular residential. Requires ¾" gas min. 2" PVC or stainless exhaust. FL rebate eligible.
Built-in recirculation pump. Popular in FL for solar-assist systems. ¾" gas line minimum.
Compact, good for 1–2 bath homes. ½" gas acceptable under 25 ft. Budget-friendly FL option.
Most sold at FL big-box stores. ¾" gas required. ENERGY STAR certified, utility rebate eligible.
Best for retrofit in FL concrete block homes. Runs around corners, through walls without fittings. Bonding required at entry point. Approved brands: Gastite, TracPipe, CounterStrike. Do NOT use CounterStrike in exterior exposed locations (UV).
Standard for exposed or mechanical room runs. Requires pipe dope or yellow Teflon tape on all fittings. FL humidity causes exterior rust — paint or coat exposed runs. Cannot use in direct contact with concrete slab.
Used for utility company service laterals and exterior yard runs. Cannot penetrate building without transition to metallic pipe at entry point. HDPE is not permitted for gas in FL.
Licensed CPC/master plumber — FL state certified gas piping
Built for Florida homes - accounting for Florida's humidity and county permitting.
Serving Palm Beach County & Florida - get matched with a licensed plumber
On this page, Florida gas tankless sizing estimates run about $1,800-$4,500, depending on home size, materials, and project scope. Use the calculator above for a Florida-specific estimate.
Pricing depends on the size and layout of your home, the pipe materials and fixtures you choose, your Florida region and local labor rates, and permit fees. Work that is more complex or harder to access generally costs more.
In Florida, minor maintenance may be DIY, but anything beyond that generally calls for a licensed plumber, and many jobs require a permit and inspection. When a permit, gas work, or your main water or drain lines are involved, hire a Florida-licensed plumber.
It depends on the cause and your specific policy. Sudden, accidental damage is more often covered than gradual wear-and-tear or maintenance - confirm the details with your insurer.
Timelines depend on scope - many routine jobs take a few hours to a day, while larger projects run longer. Your licensed plumber can confirm after assessing your home.
Planning estimate, not a quote — confirm with a licensed Florida plumber. Confidence is qualitative: ranges reflect this page’s Florida assumptions, not a guaranteed price.
Estimates on this page are Florida-specific and reflect Gas Tankless Sizing for typical Florida homes.
From this page: On this page, Florida gas tankless sizing estimates run about $1,800-$4,500, depending on home size, materials, and project scope. Use the calculator above for a Florida-specific estimate.
Your actual cost depends on your home's condition, layout, and local labor and permit rates.
From this page: Pricing depends on the size and layout of your home, the pipe materials and fixtures you choose, your Florida region and local labor rates, and permit fees. Work that is more complex or harder to access generally costs more.
Generally raises cost: harder access, older homes, added permits and inspections, premium fixtures or materials, and emergency or after-hours work.
Generally lowers cost: easy access, bundling several items in one visit, standard fixtures, and off-peak scheduling.
Curated Florida tools and resources related to this page.
Last reviewed: July 1, 2026 (US Eastern)
Reviewed by the FL Plumbing Tools editorial team.
Sources: Florida plumbing cost research and Florida Building Code / local authority-having-jurisdiction (AHJ) permit references.
Florida reference: Estimates and guidance reflect Florida labor rates, permitting, hard water, humidity, and coastal conditions.
Updates: Reviewed periodically and updated as Florida codes, permit fees, and market rates change.