SAVE FROM OVER $4200.00 ON THIS GOOD USED UNIT , A Pentair Master -Temp, Low NOx, 400K BTU, Propane Orifice , or Gas , Pool and- or Spa Heater . USED , in GOOD CONDITION . CAPABLE OF HEATING A LARGE POOL AND SPA . WORKING AS IT SHOULD WHEN TAKEN OUT OF SERVICE OF A JACUZZI AND REFURBISHED . CAN BE SWITCHED TO NATURAL GAS WITH ORIFICE CHANGE , ALL-SO CAN CHANGE 220 VOLT TO 110 UNIT ! I ALL-SO HAVE an , "AS-NEW" , UNIT . NEVER USED , TELEDYNE LAARS MARK V . 500,000 K , COMMERCIAL GAS UNIT . ASKING $1,000.00 , A SAVINGS OF OVER $4,000.00.