ResideoSKU: 38093

Resideo L8148J1009/U High and Low Limit Aquastat Relay

$326.18
In stock (10)

The L8148J1009/U Aquastat Relay provides high-limit protection with relay switching for burner and circulator motor control in hydronic heating systems. The high-limit function interrupts the burner circuit exclusively. Rated 120 VAC with a 180-240F operating range and 8F fixed differential. Supports horizontal or vertical mounting; 1-1/2 to 3 in. insulation depth. Rated 0-95% non-condensing humidity. Requires professional installation by a licensed HVAC or plumbing technician.

Shipping policy

Orders placed by 2:00pm EST will ship same day, except on holidays.

More Details

Product overview
  • High-limit burner interrupt - relay switching opens burner circuit exclusively at setpoint
  • Operating range: 180-240F with 8F fixed differential
  • 120 VAC supply voltage; horizontal or vertical mount
  • Insulation depth: 1-1/2 to 3 in.
  • Immersion-type sensing via copper bulb well
  • Humidity rating: 0-95% non-condensing
  • Application: Oil-fired and gas-fired hydronic boiler systems
Specifications
Manufacturer Part Number L8148J1009/U
UPC 85267055239
Overall Dimensions Vertical Mount: 6 1/8 in. high x 4 5/16 in. wide x 3 1/8 in. deep; Horizontal Mount: 4 5/16 in. high x 6 1/8 in. wide x 3 1/8 in. deep
Material n/a
Domestic or Import n/a
End Style n/a
Type Aquastat Relay
ADA Compliance n/a
Warning Professional installation required
Standards and Approvals UL Listed (models with well): File No. MP466, Guide No. MBPR | CSA Certified: File No. LR1620, Guide No. 400-E-O
Resources
Delivery & Returns

Orders will ship same day if received by 2pm EST.

Upcoming holiday closures: May 25, 2026

All returns are inspected on receipt; credit is issued after condition is confirmed. Credit is issued only for items returned in original, saleable condition after inspection.

FINAL SALE ITEMS ARE NOT ELIGIBLE FOR RETURNS OR EXCHANGES.

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