Quick answer
For most salt water pools, a titanium-exchanger heat pump is the safer default: the Hayward HeatPro HP21405T (140,000 BTU, about ~$6,500-$7,000) ships titanium standard with a COP around 5.7, so there’s no upcharge or special order needed. Budget-conscious owners can get the same titanium protection in the smaller FibroPool FH270 (70,000 BTU, about $1,999). If you specifically want gas heat instead — faster heat-up, works below the ~50°F point where heat pumps lose efficiency — you need to deliberately order the Pentair MasterTemp 250 HD (250,000 BTU, cupro-nickel, about $3,900) rather than the standard copper version, which isn’t rated for long-term salt exposure. Hot, humid salt-pool climates like Florida are also well served by the AquaCal SQ160R (128,000 BTU, titanium, about $5,316), a heat pump line built specifically for that environment.
A salt chlorine generator doesn’t fill your pool with ocean-strength salt water — it runs a low salt concentration (typically 3,000-3,500 ppm, versus roughly 35,000 ppm in seawater) through an electrolytic cell that converts it into chlorine on demand. That process still produces free chloride ions at a steady, continuous rate, and standard copper heat exchangers corrode faster under that exposure than they do in a traditional liquid-chlorine pool. The heat exchanger, not the heater’s cabinet or controls, is the part that actually needs to be salt-rated — here’s how to pick one that is.
Best pool heaters for salt water at a glance
| Heater | Type | Exchanger | Output | Price |
|---|---|---|---|---|
| Hayward HeatPro HP21405T | Heat pump | Titanium (standard) | 140,000 BTU | ~$6,500-$7,000 |
| FibroPool FH270 | Heat pump | Titanium (standard) | 70,000 BTU | ~$1,999 |
| Pentair MasterTemp 250 HD | Gas | Cupro-nickel | 250,000 BTU | ~$3,900 |
| Raypak AVIA HD w/ NiTek | Gas | NiTek (cupro-nickel-class) | 264,000-404,000 BTU | ~$3,802-$4,498 |
| AquaCal SQ160R | Heat pump | Titanium (standard) | 128,000 BTU | ~$5,316 |
1. Hayward HeatPro HP21405T — Best Overall for Salt Pools
Hayward HeatPro HP21405T (140,000 BTU)
- Titanium heat exchanger comes standard on every HeatPro — no salt-rated upgrade to hunt down or pay extra for.
- COP of ~5.7 keeps the salt-pool premium in check, since you're not also absorbing a higher running cost.
- Sized for most 15,000-25,000 gallon in-ground salt pools without stepping up to a commercial-class unit.
- Like any heat pump, efficiency drops as air temperature falls — see our [gas vs. heat pump guide](/guides/gas-vs-heat-pump-pool-heater/) if you heat through cold snaps too.
The HeatPro is our top pick across the whole site for a reason: its titanium exchanger was never a “salt-pool version” bolted on as an upgrade, it’s simply the only exchanger Hayward builds into this line. That removes the single biggest way owners accidentally buy the wrong heater for a salt system. Full efficiency and lineup breakdown is in our best pool heat pump guide.
2. FibroPool FH270 — Best Budget Pick
FibroPool FH270 (70,000 BTU)
- Same titanium-standard construction as the pricier picks here, at well under half the HeatPro's price.
- 70,000 BTU output suits pools up to about 21,000 gallons — check your gallon count before sizing down to save money.
- Smaller compressor draws less current, which matters if your electrical panel is already tight on a salt cell plus a heater.
Because titanium is now the standard, not the upsell, on residential heat pumps, going budget here doesn’t mean compromising on salt-water durability the way it would with a gas heater. Start the season without a shipping delay — try Amazon Prime free for 30 days for two-day delivery on a compact unit like this one.
3. Pentair MasterTemp 250 HD — Best Gas Heater for Salt Pools
Pentair MasterTemp 250 HD (250,000 BTU)
- Cupro-nickel exchanger specifically rated for salt and low-pH water, versus the standard copper version's 84% efficiency built for balanced chlorine pools.
- Roughly $200 more than the standard MasterTemp 250 — the single most important box to check when ordering, since the two versions look identical otherwise.
- Heats a pool in hours regardless of outdoor temperature, unlike a heat pump below the ~50°F efficiency cutoff.
Gas heaters are where the salt-safe upgrade actually matters, because unlike heat pumps, the standard version is still the default at checkout. The HD suffix is easy to miss on a spec sheet — confirm it before you order, not after installation. Full sizing options across the MasterTemp lineup are in our Pentair MasterTemp guide.
4. Raypak AVIA HD with NiTek — Best for Fast Heat-Up
Raypak AVIA HD with NiTek Heat Exchanger (264,000-404,000 BTU)
- NiTek is Raypak's own advanced alloy, engineered with far more nickel content than standard cupro-nickel for extra erosion and corrosion resistance in harsh water.
- Wi-Fi control through the Raymote app, carried over from the standard AVIA line.
- Spans four BTU tiers (264A-404A), so you can match output to pool size without switching model families.
If you want app control and the fastest possible heat-up alongside salt-rated durability, the AVIA HD is the more feature-rich alternative to the MasterTemp HD. See our full Raypak lineup for the standard-exchanger AVIA pricing and Raypak’s heat-pump and electric options too.
5. AquaCal SQ160R — Best for Hot, Humid Salt Climates
AquaCal HeatWave SuperQuiet SQ160R (128,000 BTU)
- AquaCal built its brand specifically around Florida and Gulf Coast conditions — hot, humid, and almost always salt-chlorinated.
- Titanium exchanger carries its own separate lifetime warranty, distinct from the unit's standard parts/labor coverage.
- Priced above the HeatPro and UltraTemp for a similar BTU class — the premium buys climate-specific engineering, not just the exchanger material.
If you’re in a climate where salt-pool ownership is close to universal, AquaCal’s whole product line was designed around that reality rather than adapted for it after the fact. Smaller and larger sizes are in our full AquaCal comparison.
Titanium vs. cupro-nickel vs. NiTek: what the difference actually means
All three materials exist to solve the same problem — chloride ions eating away at a standard copper exchanger — but they aren’t interchangeable in cost or where they show up. Titanium is the most corrosion-resistant of the three and has become the default on residential heat pumps because it doesn’t cost manufacturers meaningfully more to standardize on it at that scale. Cupro-nickel (roughly 90% copper, 10% nickel) is a step up from plain copper but a step down from titanium, and it’s the traditional salt-safe option on gas heaters. NiTek, Raypak’s proprietary alloy, sits closer to titanium-class performance — the company states it’s roughly 300% more erosion-resistant than copper and 200% more than standard cupro-nickel — while staying on the gas-heater side of the lineup rather than requiring a full heat-pump switch.
The bottom line
If you’re heating a salt water pool and don’t have a strong reason to want gas specifically, a titanium heat pump like the Hayward HeatPro HP21405T or the budget FibroPool FH270 is the simpler, lower-risk buy — titanium comes standard, so there’s no spec sheet to double-check. If you do need gas heat, don’t order the standard copper MasterTemp or AVIA by mistake: specifically choose the MasterTemp 250 HD or AVIA HD with NiTek, both built for exactly this water chemistry. In a hot, humid, salt-heavy climate, the AquaCal SQ160R is worth the premium for equipment engineered around those conditions from the start. Whichever you pick, our installation cost guide covers what the electrical or gas hookup adds on top of the heater price.