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The fact that you've introduced a hot water heater to the cooling circut may have changed things. Depending on where you tapped into the fresh water cooling circut, you may have taken the thermostat out of the loop inadvertantly. So even though the thermostat is closed, limiting the amount of water going to the heat exchanger, you may be sending it to the heat exchanger in your hot water heater instead. You could troubleshoot that by pinching/closing off the loop to the hot water heater and see if you get up to operating temperature then.
Also, the temperature of the coolant in the heat exchanger should be lower than the coolant temperature in the engine, because it's in contact with the cold raw water in the heat exchanger tubes. That's what the heat exchanger does, cools the fresh water down. I'd bet a buck that your hot water heater is probably involved.
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