Riku Mattila 
How to build a protection that prevents the non-frost-proof primary side of a heat exchanger from freezing?
Louis Botelho@rmattila74 Use electric heat tracing cables wrapped around the pipes and the heat exchanger. These cables provide a constant low level of heat to keep the fluid above freezing temperatures.
@Louisbotelho17 But how to make sure it's operational.
@rmattila74 Perplexity is a pretty good app if you can't use Grok. https://www.perplexity.ai/search/implement-a-real-time-monitori-eUoLnt.zRoW9P8RhcFwCKw