Checking The Boiler Water Pressure; Topping Up The Heating System Water - Bosch Greenstar ZBR16-3A Operating Instructions Manual

3.1 Checking the boiler water pressure

The standard boiler water pressure is 14.5 - 21.75 psi (1 - 1.5 bar).
Should a higher boiler water pressure be required, refer to a trained and certified
heating contractor.
Fig. 1

3.2 Topping up the heating system water

Topping up the heating system water is different on every system. Therefore, you
should ask a trained and certified heating contractor to show you how it is done.
Maximum pressure of 30 psi (2.07 bar) at maximum heating water temperature
must not be exceeded (safety valve will spill).
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