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My heater will cut off and give me a High Limit 1 error code and then after a few minutes will kick back on. Gas pressure is fine at 11.2 inches of water, (it is a propane heater), I put in new burners and pilot, and cleaned the heat exchanger fins. Water flow going into the heater is fine...

First, is there such a product? My hot tub was built with the ordinary nozzles that only emits large boring bubbles. Are there message jets, or roto jets or pulsating jets that are a direct replacement of my stock nozzles. I found this link, but have no idea of these will be a direct fit...