Which heats a pool faster, the Raypak 266K or the Hayward 250K?

The Raypak, on paper. It puts out 266,000 BTU against 250,000 BTU, about 6% more heat, so it recovers temperature slightly faster on the same pool.

Which is better for a saltwater pool?

The Hayward. Its cupro-nickel heat exchanger is built for salt pools, while the Raypak's copper exchanger is more exposed to corrosion in salt water.

Is the Hayward worth $450 more?

Yes if you have a salt pool or need Low NOx compliance, since those are hard requirements the Raypak does not meet. Otherwise the Raypak's extra BTUs and lower price win.

Do I need special venting for either heater?

Both are outdoor units. The Raypak needs a venting system bought separately if you install it indoors; the Hayward is listed for in-ground outdoor use.

The Hayward's cupro-nickel exchanger and self-diagnostics favor longevity, especially in salt water. The Raypak's copper exchanger and Unitherm governor hold up well in fresh water with proper chemistry.

What size pool does the Raypak 266K handle?

About 25,000 gallons for an in-ground pool and spa, at elevations from 0 to 2,000 ft.

Raypak 266,000 BTU Digital Gas Pool Heater vs Hayward H-Series 250K BTU Pool Heater

Buy the Raypak 266,000 BTU if you want more heat output, a copper exchanger, and the lower price: $3,249.00 at Pool Cleaning Parts as of November 7, 2026, versus $3,699.00 at Leslie's Pool Supplies for the Hayward. Buy the Hayward H-Series 250K if you have a salt pool, need Low NOx compliance, or want a cupro-nickel exchanger and self-diagnostics. The Raypak heats a roughly 25,000-gallon pool faster on paper; the Hayward is the tougher choice for salt water and strict air-quality states.

Today the Raypak 266,000 BTU Digital Gas Pool Heater costs $450.00 less at its best price.

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