2026 Kickoff Sale EXTENDED! 25% OFF

Start the year strong and don’t miss your last chance to save 25% storewide! Due to popular demand, our 2026 Kickoff Sale has been extended—giving you more time to grab the products you need at unbeatable prices.

Whether you’re upgrading your system, preparing for the season ahead, or restocking essential supplies, now is the perfect time to save big.

Hurry—this extended offer ends Thursday, January 15!

Outdoor boiler aquastats MUST BE PRE-PROGRAMMED for use with an outdoor boiler. ALL aquastats sold by OutdoorBoiler.com are custom programmed for outdoor boiler use through digital interface - programming cannot be performed manually.

This aquastat provides controller functions, and serves as a thermostat and water level switch. This product meets specifications for many outdoor boiler models including GX10, GX15, GX30 and others. 

This controller includes the temperature probe cable, 9.5 feet long. The brass temperature probe is 1.5 inches long, and 0.25 inches in diameter. It is recommended to secure temperature probe in thermo-well using high-temp caulk available here.