Raypak 006737F Water Pressure Switch 1.75 PSI for 206A-406A, 207A-407A, Avia 264A/404A, RP2100 R185A-R405A/R185B-R405B, 106A, 156A Pool Heaters

The water pressure switch is mounted on the in/out header and lets the heater fire only while the filter pump is running. When the pump stops and pressure at the heater drops, the switch opens and the burners shut off; digital models show Water Sw Open. Raypak sets it at the factory for a heater installed at deck level, and it can be adjusted for a heater that sits a little above or below the water.

Also listed for:

• Raypak 206A, 266A, 336A and 406A heaters, digital and millivolt (built from 10/2004)
• Raypak 106A and 156A above-ground pool heaters
• Raypak RP2100 heaters (built 11/1998 to 10/2004)
• Raypak 130A (built 10/2005 to 4/2013)
• Raypak Versa 105B with the pressure switch mounted directly on the header (built 1999 to 7/2006)

• Factory setting 1.75 PSI (12 kPa) for deck-level installations, per the 106A/156A, 207A to 407A and Avia manuals
• Adjustable with the knob on the switch
• Raypak parts library name: Kit-Pressure Switch

Raypak's adjustment diagram allows for a heater up to 5 ft above or below the pool or spa. Outside those limits Raypak offers an 11 PSI switch (009133F), or a flow switch mounted next to the heater, instead. Raypak's caution: do not operate the heater without a properly adjusted water pressure switch or flow switch.

The newest 206A to 406A manual (2026) gives the factory setting as 2.0 PSI while still listing this part, named Pressure Switch 1.75 PSI, in its parts list.

On the 106A and 156A, Raypak's winterizing steps have the switch removed and dried, because moisture left in it can freeze and damage it. Keep the header access panel in place; Raypak notes it protects the switch from rain.