Resideo L8124E1016/U is an immersion-type triple aquastat relay that combines high-limit protection with adjustable low-limit and circulator control for forced hydronic heating systems. It provides multizone control using separate circulators and R845 relays and mounts directly to the boiler. The unit uses a diaphragm powerhead with a Micro Switch assembly to sense boiler water temperature and is rated for 120 Vac operation with a 130 to 240 F temperature range.
Immersion-type controller combining high limit protection, adjustable low limit differential, and circulator control for forced hydronic heating and domestic hot water service
Provides multizone control with separate circulator and R845 relay per zone; mounts directly to the boiler (vertical mount)
Diaphragm powerhead with Micro Switch assembly; low-limit differential adjustable 10 to 25 F, high limit fixed 10 F; requires 24 Vac thermostat with 0.2 A heat anticipator
Product Highlights
Triple immersion aquastat for forced hydronic systems with adjustable low-limit differential, fixed high-limit protection, Micro Switch sensing, and 120 Vac operation.
Product Information
Standard Information
Brand: RESIDEO
Manufacturer Part Number: L8124E1016/U
Country of Origin: USA
Technical Specifications
Brand
Resideo
MPN
L8124E1016/U
Type
Triple aquastat relay (immersion-type controller)
Input Voltage
120 Vac
Application
Forced hydronic heating systems; domestic hot water service
Functions
High limit (fixed differential), low limit (adjustable differential), circulator control
Differential
Low limit: 10 to 25 F adjustable; High limit: 10 F fixed
Temperature Range
130 to 240 F (54.4 to 115.5 C)
Mounting Type
Direct mount to boiler (vertical mount)
Switch Type
Micro Switch (diaphragm powerhead assembly)
Insulation Depth
1-1/2 in
Humidity Range
0 to 95% non-condensing
Electrical Rating
Circulator full load: 7.4 A @ 120 VAC; circulator locked rotor: 44.4 A @ 120 VAC; Burner full load: 7.4 A @ 120 VAC; burner locked rotor: 44.4 A @ 120 VAC
Requires Thermostat
24 Vac thermostat with heat anticipator set at 0.2 A (plus gas valve current draw on L8124E)
Approvals and Standards
UL Listed (models with well): File No. MP466, Guide No. MBPR; UL Component Recognized (models without well): File No. MP466, Guide No. MBPR2; CSA Certified: File No. LR1620, Guide No. 400-E-O