{"product_id":"l8148j1009-honeywell-aquastat-relay-spst-high-limit-8f-differential-120v","title":"L8148J1009 | Honeywell Aquastat Relay SPST High Limit 8°F Differential 120V","description":"\u003ch4\u003eDescription \u003c\/h4\u003e\n\u003cp data-end=\"424\" data-start=\"86\"\u003eThe Honeywell L8148J1009 is a high-limit Aquastat relay designed to control burner operation in hydronic heating systems. This single-pole, single-throw (SPST) control opens the burner circuit when water temperature exceeds the set high limit, providing reliable temperature protection and efficient system operation.\u003c\/p\u003e\n\u003ch3 data-end=\"534\" data-start=\"502\"\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003cp class=\"\" data-end=\"574\" data-start=\"284\"\u003e \u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications \u003c\/h4\u003e\n\u003ctable style=\"width: 99.964%;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003eNew\/Never Used Surplus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003eHoneywell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003eTemperature Controls\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003eL8148J1009\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eSubcategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003eAquastat Relay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eSwitch Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003eSPST (Single Pole Single Throw)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003eHigh Limit Control for Hydronic Heating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eTemperature Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003e120°F to 240°F (49°C to 116°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eDifferential\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003eFixed, 8°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eVoltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003e120 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eFrequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003e60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eElectrical Ratings (Full Load)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003eBurner: 7.4 A @ 120 VAC \/ 3.7 A @ 240 VAC; Circulator: 7.4 A @ 120 VAC \/ 3.7 A @ 240 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eElectrical Ratings (Locked Rotor)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003eBurner: 44.4 A @ 120 VAC \/ 22.2 A @ 240 VAC; Circulator: 44.4 A @ 120 VAC \/ 22.2 A @ 240 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eAnticipator Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003e0.2 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eMounting Orientation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003eVertical or Horizontal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eConnection Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003eQuick-Connect Terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eCapillary Length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003e4-1\/2 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eMax Pressure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003e255 PSI (Immersion Well)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eOperating Humidity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003e0% to 95% (non-condensing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eMax Ambient Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003e150°F with 1.2A 24V Load \/ 77°F with 1.4A 24V Load\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eHousing Dimensions (H × W × D)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003e6-1\/8 in × 4-3\/8 in × 3-1\/8 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eMounting Style\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003eImmersion Well\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eTransformer Terminals\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003eIncluded for Remote Low Limit Controller\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eSafety Feature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003eHigh-Limit Opens Burner Circuit Only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eCompliance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003eUL Listed, CSA Certified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 23.1146%;\"\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 76.7522%;\"\u003e4.00 lbs (1.81 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003e\u003cbr\u003e\u003c\/h4\u003e\n\u003ch4\u003eInformation About \u003cspan data-sheets-root=\"1\"\u003eL8148J1009\u003c\/span\u003e\n\u003c\/h4\u003e\n\u003cp\u003eThe L8148J1009 is part of Honeywell’s trusted L8148 Series Aquastat family, designed to provide temperature control and safety shutoff in hydronic heating systems. It acts as a high-limit control that opens the burner circuit when the boiler water temperature exceeds a preset threshold, protecting the system from overheating. The built-in transformer and accessory terminals allow connection of a remote low-limit controller for expanded control flexibility. Featuring a fixed 8°F differential, the unit ensures stable cycling and efficient burner performance. Its rugged construction and compatibility with both vertical and horizontal mounting orientations make it ideal for a variety of boiler applications. The L8148J1009 offers quick-connect terminals for simplified wiring and an immersion-type sensing bulb for precise temperature monitoring.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHigh-Limit Temperature Control: Opens burner circuit when temperature exceeds preset limits, ensuring system safety.\u003c\/li\u003e\n\u003cli\u003eSPST Switching Action: Provides simple, reliable control for burner circuits in hydronic heating systems.\u003c\/li\u003e\n\u003cli\u003eFixed 8°F Differential: Maintains consistent system cycling and prevents short cycling.\u003c\/li\u003e\n\u003cli\u003eBuilt-In Transformer: Includes accessory terminals for connection to remote low-limit controls or zone systems.\u003c\/li\u003e\n\u003cli\u003eDual Mounting Options: Can be mounted vertically or horizontally for flexible installation.\u003c\/li\u003e\n\u003cli\u003eQuick-Connect Terminals: Simplifies electrical wiring and reduces installation time.\u003c\/li\u003e\n\u003cli\u003eHigh Pressure Rating: Withstands up to 255 PSI in immersion well applications for added durability.\u003c\/li\u003e\n\u003cli\u003eWide Operating Range: Adjustable from 120°F to 240°F for a variety of heating applications.\u003c\/li\u003e\n\u003cli\u003eReliable Flame Safety Control: Automatically interrupts burner operation for overtemperature protection.\u003c\/li\u003e\n\u003cli\u003eProven Honeywell Design: Built for long service life and consistent performance in residential and light commercial systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe L8148J1009 delivers the reliability and precision required for hydronic heating systems, ensuring safe operation, accurate temperature control, and long-term durability.\u003c\/p\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":49105124622592,"sku":"L8148J1009","price":580.65,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0388\/5331\/2557\/files\/CC-TDOR11_22_b06e4297-b78e-4493-b41a-129876d24eb1.png?v=1785540803","url":"https:\/\/alotechparts.com\/products\/l8148j1009-honeywell-aquastat-relay-spst-high-limit-8f-differential-120v","provider":"Alo Tech Solutions","version":"1.0","type":"link"}