The Bosch 450 ESR NG is not approved or designed for closed loop heating applications. The ESR unit is not a tankless heater as they have no flow switch to respond to flow. Instead it’s a recirculating water heater designed for tank loading applications. When an AquaStat (not included) hooked up to a tank tells the ESR that water needs to be brought back up to temperature, the ESR will tell a circulator (not included) to turn on to create flow through the heater to reheat the water in the tank. Please refer to the installation and applications manual.
The temperature control range can be set anywhere from 115°F (45°C) - 190°F (90°C)
The Bosch ProTankless 450 ESR comes with a standard ¾” pressure relief valve.
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