Which is better for a spa or hot tub?

The Pentair. Gas heat at 125,000 BTU warms fast and reaches spa temperatures; the FibroPool is rated only to 82°F.

Which costs less to run?

The FibroPool in most cases. At COP 5.92 it delivers about 5.92 units of heat per unit of electricity, while propane at 82% efficiency is tied to fuel prices.

The FibroPool's titanium exchanger resists salt and corrosion better. The Pentair's copper exchanger is durable but less forgiving in saltwater pools.

Is the FibroPool worth the extra $63.87?

Yes if you have 240V power and heat a pool up to 10,000 gallons; the lower running cost usually repays the difference quickly. Skip it if you need fast heat or spa temperatures.

Can the FibroPool replace a gas heater?

Only for pools up to 10,000 gallons where slow, steady heating is fine. It will not match a 125,000 BTU gas heater's speed or top temperature.

Which is better for a saltwater pool?

The FibroPool, because of its titanium heat exchanger. The Pentair's copper exchanger is the weaker match for saltwater.

Pentair MasterTemp 125K BTU Pool Heater vs FibroPool FH255 Pool Heat Pump

Buy the Pentair MasterTemp 461061 if you have a propane line and want fast heat for a pool up to 15,000 gallons or a spa. Buy the FibroPool FH255 if you have 240V power and want low running costs for a pool up to 10,000 gallons. The Pentair is $1,736.12 at Pool Supply Harbor as of November 7, 2026; the FibroPool is $1,799.99 at FibroPool as of November 7, 2026. The Pentair costs slightly less up front, but the heat pump usually costs far less to run.

Today the Pentair MasterTemp 125K BTU Pool Heater costs $63.87 less at its best price.

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