Which is better for an above-ground pool?

The FibroPool FH255. It is rated for above-ground pools up to 21 feet round or 15 x 30 oval, and the Pentair is built for larger in-ground pools and spas.

Which heats a large in-ground pool faster?

The Pentair UltraTemp. Its 143,000 BTU is about 2.6 times the FibroPool's 55,000 BTU, so it moves far more heat into a big pool.

Is the Pentair worth the extra $3,400?

Only if your pool is too big for 10,000 gallons or you want the plastic cabinet for a salt pool. For a smaller pool, the FibroPool heats at a higher COP for far less money.

The Pentair is built for a longer life, with a 100% titanium exchanger, a corrosion-resistant composite cabinet and automatic defrost. The FibroPool's steel case has rusted for at least one saltwater owner.

What electrical setup does each need?

The FibroPool runs on a 240V, 12A circuit. The Pentair needs 230V single phase with a 50A breaker and draws 7.2 kW.

Can either work with a saltwater pool?

Both use titanium exchangers, which resist saltwater corrosion. The Pentair's plastic cabinet avoids the rust risk that the FibroPool's enamel-coated steel case carries.

FibroPool FH255 Pool Heat Pump vs Pentair UltraTemp Heat Pump

Buy the FibroPool FH255 for an above-ground pool or an in-ground pool up to 10,000 gallons; it costs $1,799.99 at FibroPool as of November 7, 2026. Buy the Pentair UltraTemp for a large in-ground pool or spa that needs 143,000 BTU and a corrosion-proof cabinet; it costs $5,199.99 at Pool Cleaning Parts as of November 7, 2026. The Pentair costs about $3,400 more, and that premium buys roughly 2.6 times the heating capacity, not better efficiency.

Today the FibroPool FH255 Pool Heat Pump costs $3,400.00 less at its best price.

Ask our shopping agent

It checks today's price at every store, compares the alternatives and answers in about a minute.