Spa Hydro Pack Air Button Controlled - 240 Volt 5.5KW Heater - The Hot Tub SuperStore, USA, Canada
Hi-Limit/Temp Sensor Kit for Watkins Hot Springs Spa No-Fault Heater 39525/39530 | eBay
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Balboa BP2000 Technical Series - TroubleShooting / Testing the Heater - YouTube
1989 Hot Springs Heater Issue - With Pics - Portable Hot Tubs & Spas - Pool and Spa Forum
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Help! Where is the high limit switch located in this photo? I was told all got tubs have one. I feel like mine doesn't. : r/hottub
Amazon.com : Ebusin 220V 3KW Spa Hot Tub Heater with Adjustable Temperature Thermostat, Inflatable Pool Heater for Above Ground Pools, Hot Tubs & Inflatable Bathtub,H30-RS1 : Patio, Lawn & Garden