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Bosch Temp Adjust Knob 520 PN
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Bosch Temp Adjust Knob 520 PN is a replacement temperature-adjustment control intended for use with Bosch Therm 520 PN gas tankless water heaters. It restores manual user adjustment of outlet temperature and supports serviceability during commissioning and routine maintenance, giving installers and parts distributors a direct-fit spare to replace worn or missing controls. I could not locate a Bosch listing for part number 87020002950 on Bosch North America sites; Therm 330/520 PN spare-parts documentation was used for context. (bosch-homecomfort.com)
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