Water Heater Replacement
Water heater replacement is warranted when the tank itself leaks, the unit is near end of life, or repeated repairs no longer make sense. Replacement includes sizing, tank-versus-tankless and fuel decisions, permits, and safe removal of the old unit.
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Short answer
A water heater is replaced rather than repaired when the tank itself is leaking, when it has reached the end of its service life and is failing repeatedly, or when the repair approaches the cost of a new unit. Replacement involves sizing for the household's demand, fuel type and venting, code-required items such as the relief valve discharge and seismic or platform requirements where they apply, and in most Florida jurisdictions a permit.
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Signs it is time to replace
- Water seeping from the tank body rather than a fitting
- Persistent rusty hot water that doesn't clear
- The unit is beyond its expected service life
- Repeated repairs in a short period
- Capacity no longer matches household demand
Sizing and fuel type decisions
Before any installation, a professional sizes the replacement to household demand — number of bathrooms, peak simultaneous use, and recovery rate for tank units, or flow rate and temperature rise for tankless. Fuel type is often kept the same as the existing unit since it reuses existing gas or electrical infrastructure, but a switch between electric and gas, or a tank-to-tankless conversion, is possible where the utility connections and venting can support it.
Tank versus tankless
| Type | Advantage | Requirement |
|---|---|---|
| Tank | Lower equipment and install cost, simpler venting | Floor space, drain pan often required, periodic sediment flushing |
| Tankless | Continuous hot water, smaller footprint | Larger gas line or dedicated electrical circuit, specific venting, sometimes a recirculation line |
What the installation job includes
A professional disconnects and drains the old unit, sets and levels the new one, and addresses code-required components — expansion tanks, drain pans with a routed drain line, strapping, shutoff valves, and correct venting for gas units — then tests for leaks and verifies proper operation and temperature. Permits and a final inspection are typically required for water heater replacement in Florida, and the installer should pull the permit rather than skip it.
Tankless conversions add gas line resizing, new venting, and sometimes a dedicated electrical circuit for controls, so they're usually scheduled rather than completed same-day. Removal and disposal of the old tank is normally included in the job.
Is replacement urgent?
A tank actively leaking from its body, or one that has already failed and left the household without hot water, is generally urgent and worth scheduling promptly. A unit that's simply aging or slightly undersized for current household demand can be planned on your own timeline, which also allows time to compare tank and tankless options properly.
What drives the cost of replacement
- Tank versus tankless, and capacity or flow-rate sizing
- Fuel type, and whether gas line, venting, or electrical upgrades are needed
- Code items required by the local permitting jurisdiction (pans, straps, expansion tanks)
- Access and removal difficulty — attic and closet installs take longer than open garage placements
- Disposal of the old unit
South Florida specifics
Florida's plumbing code requires hurricane strapping for water heaters in many jurisdictions and typically requires a permit and inspection for replacement, not just new construction — a licensed installer should already build this into the job. Many South Florida homes place water heaters in garages, closets, or attics rather than basements, which affects drain pan routing and access for hauling out the old tank. Salt air near the coast shortens the service life of tank jackets and fittings, and hard water region-wide adds to sediment accumulation, both of which are worth factoring into how soon a unit is likely to need replacing again.
Should I repair or replace my water heater?
Repair usually makes sense when the tank itself is sound and the failure is a component — thermostat, heating element, thermocouple, gas valve or anode rod — on a unit still within its expected service life. Replace when the tank is leaking from the body, when the unit is near or past its rated life, or when repeated repairs are stacking up. A leaking tank cannot be repaired.
| Symptom | Typical direction |
|---|---|
| Water pooling from the tank body | Replace |
| No hot water, tank dry and sound | Repair the failed component |
| Rusty hot water or heavy sediment noise on an older unit | Evaluate for replacement |
| Pilot or igniter failure on a newer unit | Repair |
Repair when
- The tank is not leaking
- The unit is comfortably within its service life
- One component explains the symptom
Replace when
- The tank shell is leaking
- The unit is at or past its rated life
- Repair cost approaches a large share of replacement
Safety note: Water dripping from the temperature and pressure relief valve is a safety signal — have it diagnosed rather than capped.
Terms explained
- What counts as emergency plumbing?
- Emergency plumbing covers plumbing failures that cause damage or make a property unusable if left until the next business day — burst pipes, uncontrolled leaks, sewage backups, overflowing fixtures, a failed water heater flooding a space, or a complete loss of water supply. Work is dispatched outside normal hours and is usually billed at higher rates.
Frequently asked questions
Tank or tankless?
Tankless units save space and can lower standby losses but require larger gas or electrical capacity and correct venting. Tank units cost less to install. The right answer depends on the property's existing utilities and hot water demand.
Do I need a permit to replace a water heater in Florida?
In most South Florida jurisdictions, yes — water heater replacement typically requires a permit and a final inspection, even when it's a like-for-like swap. A licensed installer should handle this as part of the job.
How long does a replacement take?
A straightforward tank-for-tank swap is often completed in a few hours. Tankless conversions or fuel-type changes that require new gas, venting, or electrical work usually take longer and may need to be scheduled in advance.
What happens to my old water heater?
Removal and disposal of the old unit is typically included in a replacement job. Confirm this with your provider before work begins.
Sources
- Verify a Florida contractor or plumbing license — Florida DBPR Licensing Portal
- Fix a Leak Week — finding and fixing household leaks — U.S. EPA WaterSense
- Mold cleanup in your home — dry wet materials within 24–48 hours — U.S. EPA
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This guide is the canonical explainer for the work itself. The city hubs below add the local detail — ZIP coverage, housing stock and the failures that come up most in that market.
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