![Balboa 58321 Trombone lo flow heater 4 kw Balboa 58321 Trombone lo flow heater 4 kw](https://cdn11.bigcommerce.com/s-whbac/images/stencil/300x300/products/2284/5297/63a93610-54fc-4dc0-ab45-eeeec4bcf9b4__76960.1679411169.jpg?c=2)
Compatible replacement heater for some Hot Springs spas from 1995 to current and also used in many Tiger River Spas. This heater has 2 sensors that plug directly onto the circuit board and should only be used to replace the Hot Springs heater part number 73791, 76228 and C3160-2S.