{"product_id":"l8148e1257-honeywell-high-limit-aquastat-relay-140-240f-with-vent-damper-connection","title":"L8148E1257 | Honeywell High Limit Aquastat Relay 140–240°F with Vent Damper Connection","description":"\u003ch4\u003eDescription \u003c\/h4\u003e\n\u003cp data-end=\"500\" data-start=\"143\"\u003eThe Honeywell L8148E1257 High Limit Aquastat Relay provides precise high-limit temperature control for hydronic heating systems. Designed for vertical mounting, it features a 140–240°F temperature range and includes a vent damper connection, ensuring efficient burner operation and reliable system safety.\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%; height: 475.4px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003eNew\/Never Used Surplus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 24.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 24.6px;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 24.6px;\"\u003eHoneywell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003eHVAC Controls\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003eL8148E1257\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003eSubcategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003eAquastat Relay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003eHigh Limit Aquastat Relay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003eTemperature Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003e140°F to 240°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003eControl Function\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003eHigh Limit (Burner Circuit Only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003eMounting Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003eVertical Case\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003ePower Supply\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003e120 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003eThermostat Requirement\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003e24 VAC Thermostat (0.2A Anticipator Setting)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003eTransformer Included\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003eYes (Integral Transformer for 24V Control Circuit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003eAccessory Terminals\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003eFor Remote Low Limit Controller\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003eVent Damper Connection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003eSwitch Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003eSPST Relay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003eControl Circuit Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003e24 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003eHydronic Heating Systems (Oil or Gas Boilers)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003eCase Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003eMetal Enclosure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003eElectrical Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003eDesigned for Line and Low Voltage Circuits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003eOperation Mode\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003eOpens Burner Circuit at High Limit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003eSafety Feature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003eAutomatic Reset on Temperature Drop\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003eMounting Orientation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003eVertical Only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003eDimensions (Approx.)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003eStandard Honeywell Aquastat Relay Form Factor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 25.679%; height: 19.6px;\"\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 74.1878%; height: 19.6px;\"\u003e4.00 lbs\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\"\u003eL8148E1257\u003c\/span\u003e\n\u003c\/h4\u003e\n\u003cp\u003eThe L8148E1257 belongs to Honeywell’s trusted line of Aquastat relays designed to regulate boiler temperature and burner control in hydronic heating systems. It serves as a high-limit controller, opening the burner circuit when water temperature exceeds the set limit. This model operates within a 140°F–240°F range and includes integrated terminals for connecting a vent damper and optional remote low-limit controller. The vertical-mount metal case design provides durability and efficient heat dissipation, while its integral transformer powers the 24 VAC control circuit. Engineered for reliability, it ensures precise system control, reduced cycling, and protection from overheating.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHigh Limit Temperature Control: Monitors and interrupts burner operation when water temperature exceeds set parameters.\u003c\/li\u003e\n\u003cli\u003eWide Adjustable Range: Operates from 140°F to 240°F for flexibility in hydronic heating systems.\u003c\/li\u003e\n\u003cli\u003eIntegrated Transformer: Supplies 24 VAC power to thermostat and control circuitry.\u003c\/li\u003e\n\u003cli\u003eVent Damper Connection: Supports automatic vent damper systems for improved energy efficiency and safety.\u003c\/li\u003e\n\u003cli\u003eVertical Mount Configuration: Designed for easy installation and optimal thermal response.\u003c\/li\u003e\n\u003cli\u003eAccessory Terminals: Allows connection of optional remote low limit controller for enhanced system functionality.\u003c\/li\u003e\n\u003cli\u003eDurable Metal Enclosure: Provides long-term protection and stable operation under high temperature conditions.\u003c\/li\u003e\n\u003cli\u003eReliable Safety Function: High limit relay opens the burner circuit only, preventing overheating while maintaining system stability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe L8148E1257 delivers the reliability and precision required for safe, efficient operation of hydronic boiler systems and temperature-based burner control.\u003c\/p\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":49105136386304,"sku":"L8148E1257","price":774.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0388\/5331\/2557\/files\/Z_py_8lcpIx.jpg?v=1785541030","url":"https:\/\/alotechparts.com\/products\/l8148e1257-honeywell-high-limit-aquastat-relay-140-240f-with-vent-damper-connection","provider":"Alo Tech Solutions","version":"1.0","type":"link"}