Bosch C1210ES Specifications download pdf (Page 32)

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Installation instructions

3.12 Domestic hot water recirculation

Although recirculation directly through the tankless

water heater is allowed, temperature stability is

improved by recirculating through a mini-tank as shown

in Fig. 35. By using the design in Fig. 35, there is no

recirculation of hot water through the tankless water

heater and therefore, does not affect the heat

exchanger warranty of 15 years. Direct recirculation

through the tankless water heater is permissible,

however, the heat exchanger warranty is reduced to 3

years; contact Bosch Thermotechnology for further

installation requirements. The following drawing is

provided to outline one possible recirculation design

using the water heater in conjunction with an Ariston

mini tank water heater. This schematic is for illustration

only and must not be used for actual Installation without

appropriate engineering and technical advice from a

properly licensed professional in the locality where the

installation is made.

Fig. 40 Recirculation application

1 Full port isolation valve

2 Circulator on timer or aquastat

3 Check valve

4 PRV

5 Expansion tank

The use of a small electric mini-tank water heater (4-6

gallon size) should be used for this application and

designed so the circulator will circulate the water

through the mini-tank and the building's hot water return

loop only. Timed or thermostatically controlled

operation of the pump is commonly done. Contact

Bosch Water Heating if further information is needed.

6720608836-12.1AL

Ariston Minitank

GWH

C 1210

ES/

ESC

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Bosch C1210ES Specifications Page 32