Isomac MATER Pressure Switch XP110 125 - 0.5-1.2 BAR - 1/4" BSPM - 1320545

Isomac Mater Pressurestat — XP110, 0.5–1.2 Bar

The pressurestat (pressure switch) controls boiler temperature on your Isomac espresso machine by cycling the heating element on and off to maintain a set pressure. When the pressurestat fails — typically with its internal contacts welded shut from years of electrical arcing — the element runs continuously, boiler pressure climbs past the safety zone, and the safety relief valve opens. This is the correct Mater replacement pressurestat for the most popular Isomac models.

Part Details

• Brand: Mater
• Model: XP110 125
• Pressure range: 0.5–1.2 Bar
• Connection: 1/4" BSPM
• Part No.: 1320545
• Isomac / Pavoni cross-ref: 451306

Compatible Models

Isomac: Millennium, Mondiale, Pro 3.1, Pro 6.1, Tea, Zaffiro

Elektra: Microcasa

La Pavoni: Botticelli Evoluzione, Cellini Classic, Cellini Evoluzione, Giotto Evoluzione, and others (post-2020 variants)

Not sure if this is the correct pressurestat for your machine? Contact us with your model name to confirm before ordering.

Symptoms of a Failed Pressurestat

• Boiler pressure gauge climbs past 1.2–1.5 bar and doesn't stop
• Safety relief valve opens and vents steam during operation
• Heating element runs continuously without cycling off
• Machine overheats

Installation Notes

• Always unplug and fully cool the machine before replacing the pressurestat
• Release all boiler pressure before removing the old pressurestat
• Photograph wiring before disconnecting the spade terminals
• Apply 2–3 wraps of PTFE tape to the thread before fitting
• Thread in by hand first, then tighten firmly — do not overtighten
• On first heat-up after replacement, monitor the gauge to confirm the element cycles on and off at normal pressure

Fast dispatch from Sydney. Australian stock.