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12-04-2020, 09:23 AM #9
Your circulation pump for the heater is always on with the engine on (it's tied to the fuel pump circuit) so when you turn on the heater the only thing you're turning on is the blower fan.
The coolant is running through it all the time in a constant loop when the engine is running.
The shower setup would be the same, coolant always flowing through the heat exchanger but no hot water until you turn on the shower pump.
Something that just occurred to me is that that first burst of water when turned on will have been sitting in the exchanger so it will be quite hot (engine temp most likely).
May not be a great idea afterall, i'd hate for a kid to turn it on and get blasted with a seconds worth of 160 degree water.2020 Supra SA