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Safety lock out - Default max. 120 degrees (refer to owner's manual for higher temp) 93% Efficiency Standard burner - High performance single flame burner. Fully modulating burner - Automatically adjusts burner level accordingly. Turbo Flow - Up to 7.1 GPM @ 35 degree temperature rise (6.3 GPM @ 45 degree rise). 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. Parts Warranty: 5 year Residential Heat Exchanger Warranty: 12 years (Price subject to change without notice. Check stock before order)