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Recirculating Water Heaters

The Bosch ProTankless Recirculating Water Heaters 345 ESR and the 450 ESR are temperature modulated and have electronic ignition. These recirculating water heaters are designed and approved for heating and recirculating potable water in conjunction with an indirect tank. The 345/450 ESR heaters are not approved or designed for closed loop heating applications. The ESR units are not traditional tankless water heaters. They have no flow switches to respond to flow. Instead they are recirculating water heaters 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.

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