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The No-Fault heater was first introduced by Watkins Manufacturing in 1995, with the name reflecting the fact that poor water chemistry maintenance would no longer be a cause to void the heater warranty. The second version of the No Fault heater was released in 1997, and stayed in use on production Spas until late 2003. No-Fault heater version three was brought into play in the Tiger River spa range, with some dealerships using it to replace the heaters in both HotSpring and Tiger River hot tubs.

This heater was the fourth No-Fault produced by Watkins, and was put into use from 2004 onwards. This version has shown itself to be the most reliable design used in HotSpring and Tiger River spas. This type of heater is still being used for hot tubs being produced by the Watkins factory.

This is the flow-thru type heater which was used on HotSpot and Solana hot tubs from 1999 to 2005, including the HotSpot RE, RLX (Z/ZQ), SE, SLX (Y/YQ) and Solana RX and SX. This heater is attached to the Spa control and plumbing system using compression fittings at both ends.

This heater is the flow-thru type used on 2006 onwards Solana TX, RX and SX hot tubs, along with 2006 onwards HotSpot spas including the HotSpot Mallorca, Sorrento, Trinidad and Tobago models. The heater connects to the control box and hot tub plumbing using compression fittings supplied attached at either end of the heater.