Hot Tub Heater Watkin No Fault Titanium Heater 4kW 73791-PDR OEM . This Heater comes from Watkins made for Watkins not an after market part. This 4kW PDR Titanium Heater is the current replacement for all 2003-2009 4kW No Fault Heaters. If you're replacing a 76228 Titanium Heater (pressure switch version) you'll need to add a pressure switch bypass jumper shown in the Related Items below. For the 6kW (6000 watt) version, please see the 73790.
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