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The Intermatic 156T4042A Fireman Switch is designed to provide coordinated control for pool and spa heaters, as well as filter pumps. This switch turns off a gas-fired pool or spa heater about 20 minutes before the filter pump shuts down. This reduces the potential for pounding and knocking caused by overheated water, while also reducing scale and lime deposits, which extends the life of the heater.
The Intermatic 156T4042A Fireman Switch is essential for maintaining the longevity of your pool or spa heater. It effectively eliminates the issues of pounding and knocking, and extends the lifespan of your equipment by reducing harmful deposits.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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