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Bosch 87154073280 Expansion Vessel Features:
- Maintains stable pressure within the sealed heating circuit of compatible boilers.
- Absorbs the extra water volume created as system water heats and expands.
- Keeps circuit pressure inside its working band so the safety relief valve is not forced to discharge.
- Internal diaphragm separates the heating water from the air charge held behind it.
- Flat pressed steel panel design with rounded corners and shallow depth rather than a bulky cylindrical shell.
- Mounts vertically against the inner wall of compatible boiler casing without adding to the appliance footprint.
- Slim profile allows easier access during replacement than a round tank.
- Grey protective coating over the pressed steel body.
- Threaded connection stub positioned at the lower corner.
- Fixed mounting bracket for secure location inside the boiler chassis.
- Schrader-type valve on the side edge for checking and recharging air pressure during routine servicing.
- Alternate part number 8-715-407-328-0.
Fits These Bosch Models:
- KBR 35-3.
- KBR 42-3.
- KWB 28-3.
- KWB 35-3.
- KWB 42-3.
Additional Features:
The Bosch 87154073280 expansion vessel maintains stable pressure within the sealed heating circuit of compatible boilers, absorbing the extra volume created as system water heats up so that pressure stays inside its working band and the safety relief valve is not forced to discharge, with an internal diaphragm keeping the heating water separated from the air charge held behind it. Instead of the bulky cylindrical shell common to generic replacement vessels, this unit is pressed as a flat steel panel with rounded corners and a shallow depth, a shape chosen so it can sit vertically against the inner wall of the boiler casing without adding to the appliance footprint, which also makes access during a swap far easier than working around a round tank. It is supplied in a grey protective coating with a threaded connection stub at the lower corner, a fixed mounting bracket for secure location inside the chassis, and a Schrader-type valve on the side edge that allows the air pressure to be checked and recharged during routine servicing.