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Safety lock out - Default max. 120 degrees (refer to owner’s manual for higher temp) Dual flame burner - Noritz exclusive! Minimizes temperature fluctuations. Fully modulating - Automatically adjusts burner level accordingly. Turbo Flow - Up to 9.8 GPM @ 35 degree temperature rise (7.5 GPM @ 45 degree rise). Quick Connect - Doubles the output by connecting two identical heaters. Direct ignition - No standby pilot light. Thermal fuse - Automatic overheat protection system. Resin coated PC board - Increases durability and protection from elements. Automatic air regulator - Monitors internal temperature/maximizes burner efficiency. (Price subject to change without notice. Check stock before order)