Is $5,500 to replace a pentair spa heater a fair price?

This quote includes the supply and installation of a new 75-gallon natural gas power vented water heater, along with all necessary piping and fittings. - Water Heater Type: 75 gallon natural gas power vented - Included Components: Mixing valve, Expansion tank - Piping Material: 3/4 copper - Fittings: All 3/4 fittings needed to assemble the water heater correctly

This quote is for the replacement of an existing pool/spa heater. The homeowner is considering replacing the current 2009 Pentair Mastertemp 400 heater with a new one, potentially the same model or a stronger Pentair heater suitable for a larger pool/spa. The existing heater is malfunctioning, turning on and off and failing to reach the selected temperature, despite previous repair attempts by a pool service company. The quote covers the cost of a new unit and its installation. The homeowner is evaluating whether to invest in a new heater versus repairing the old 16-year-old unit. They are also curious about improvements in Pentair heaters since 2009 and the potential benefit of a stronger model for their pool/spa size. The quote is for a new heater, implying the full cost of the unit and its installation. - Scope: Replacement of existing pool/spa heater - Current Heater: Pentair Mastertemp 400 (from 2009) - New Heater Consideration: Pentair Mastertemp 400 or a stronger Pentair model - Reason for Replacement: Current heater turns on and off, won't reach selected temperature, and previous repair attempts by pool service company failed.

Installation of a new variable speed pool pump, requiring plumbing modifications due to it being a different model and brand than the existing unit. - Pool Pump Model: Pentair EC-011533 WhisperFlo VS Variable Speed Pool Pump - Horsepower: 2.6 THP - Work Scope: Replacement of existing pump, including necessary plumbing adjustments.