Does the cooling system have enough heat capacity that you could get a hot shower out of it with the engine off? Wondering if you can hook it in parallel with an electric circulator and get adequate results, allowing you to get your shower without leaving the engine running.
I suspect the 'minimum flow rate' is what you need to drive in order to achieve the advertised energy transfer of the heat exchanger.
I suspect the 'minimum flow rate' is what you need to drive in order to achieve the advertised energy transfer of the heat exchanger.