Pool Heater Replacement

Heater Replacement: what it involves

Replacing a pool heater is more than unbolting one box and setting another. The new unit has to be sized to the pool's surface area and how warm you want it, matched to the electrical circuit or gas supply that's there, plumbed so the water flow is right, and bonded to the pool's equipotential bonding grid. Getting any one of those wrong leads to a heater that runs all day without keeping up, or one that trips breakers.

Most replacements in Pasco go heat pump for heat pump, but it's the right moment to ask whether that's still the best choice. A spa that needs heat fast may be better on gas or propane. A pool heated only in spring and fall may not need the biggest unit on the shelf. And an older home may need a new breaker or wire size for a modern heat pump, which is better found on the estimate than on install day.

When replacement beats repair

• The compressor, coil or heat exchanger has failed on a heater over about 8 years old
• Repairs have been needed more than once in the past year or two
• Heavy corrosion on the cabinet, coil fins or burner tray
• The heater can't keep the pool at temperature even when it runs nonstop
• Parts for the model are discontinued or back-ordered

Common methods

Permits for a new pool heater

Many Florida building offices require a permit for a new or replacement pool heater, mainly so an inspector can check the electrical connection and the bonding. Gas heaters add gas piping. In unincorporated Pasco the permit goes through Pasco County Building Construction Services and its online portal; inside New Port Richey or Port Richey, or in Hernando County, the local office for the parcel applies. Ask your contractor to pull it in their name and include it in the price.

How a heater replacement usually goes

1. Site visitThe contractor checks the pool size, the old heater, the breaker panel or gas supply and where the new unit will sit.
2. Written optionsYou get one or two heater options with sizes, prices and any electrical or gas upgrades.
3. PermitThe contractor applies for the permit with the office that covers your parcel.
4. Install dayOld heater out, new heater set, plumbed, wired or piped, and bonded. Usually one day.
5. Inspection and walk-throughAfter the inspection, the contractor shows you the controls and the maintenance basics.

Ask who registers the warranty with the manufacturer; some warranties need registration within a set time.

What a replacement costs

Swimply's 2026 guide lists gas heaters at about $1,500 to $6,000 installed and heat pumps at about $2,000 to $8,000, and notes that a new circuit or gas line is the most common surprise cost. HomeGnome puts typical heat pump installs at about $2,500 to $7,000. Your written estimate is what counts.

Reference figure, not a quote: HomeGnome pool heater cost guide (2026), checked October 2026.

Where replacements are most common

• Bayonet Point1980s and 1990s pools on second or third heaters
• HolidayOlder pools with salt-air corrosion
• HudsonCoastal salt and long-running units
• ElfersEstablished homes replacing aging heaters
• Port RicheyWaterfront equipment pads near the river
• Spring HillMany 1990s heat pumps at the end of their life

Related services: Pool Heat Pump Repair, Gas & Propane Pool Heater Repair, Solar Pool Heater Repair.