Which heats a pool faster?

The Raypak 406A, by a wide margin. At 399,000 BTU it outpaces the FibroPool's 55,000 BTU roughly sevenfold, and buyers report the FibroPool gains about 1°F per hour.

Which is cheaper to run?

The FibroPool, in most cases. Its COP of 5.92x means about 5.9 units of heat per unit of electricity, while the Raypak burns gas at 82% efficiency. Compare against your local gas and electric rates.

Will the FibroPool heat my in-ground pool?

Only up to 10,000 gallons. Above that, or for fast recovery on a large pool, the Raypak is the right choice.

Can the FibroPool heat a spa?

No. It is rated to 82°F, below typical spa temperatures. The Raypak gas heater is the one for a hot tub.

Is the Raypak worth $2,600 more?

Only if you need its output. At $4,426.00 at The Home Depot versus $1,799.99 at FibroPool on November 7, 2026, the Raypak earns its price on large pools and spas; on a small pool the FibroPool does the job for less.

Both are built to last, but the FibroPool's titanium exchanger resists saltwater corrosion while its steel case has rusted on at least one salt pool. The Raypak's gas-fired exchanger is the wear item; proper water chemistry matters most for either.

Raypak 406A Pool Heater vs FibroPool FH255 Pool Heat Pump

These are different classes of heater, not close substitutes. The Raypak 406A is a 399,000 BTU natural gas heater that will heat a large pool fast; the FibroPool FH255 is a 55,000 BTU heat pump that heats slowly but cheaply to run. On November 7, 2026 the Raypak's best new price is $4,426.00 at The Home Depot and the FibroPool's is $1,799.99 at FibroPool. Buy the Raypak for a big in-ground pool and fast heat; buy the FibroPool for a small pool or above-ground pool and low running costs.

Today the FibroPool FH255 Pool Heat Pump costs $2,626.01 less at its best price.

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