Features:

Immersion Type Controllers that Combine High Limit Protection with Low Limit and Circulator Control in Forced Hydronic Heating Systems, Including Domestic Hot Water Service
Provide Multi-Zone Control by Using a Separate Circulator and R845 Relay for Each Zone
Include Diaphragm Power Head and Micro Switch Assembly that Respond to Temperature Changes in Boiler Water, Mount Directly to Boiler
Select Models Include Large Transformers and Extra Terminals for Supplying Power to Low Voltage Zone Valves
Require 24 Volt AC Thermostat with Heat Anticipator Set at 0.2 Amp (Plus Current Draw of Gas Valve on L8124E)
Tradeline Models Include Tube of Heat Conductive Compound and Range Stops

Specifications:

Manufacturer: Honeywell
Manufacturer Part Number: L8124G1020
Product Type: Aquastat Relay
Media Handled: Hot Water
Temperature Range: 130 to 240 Degrees F (High Limit), 110 to 220 Degrees F (Low Limit)
Maximum Temperature Rating: 150 Degrees F (Switch), 265 Degrees F (Sensing Element)
Pressure Rating: 200 PSI (Outside of Immersion Well), 100 PSI (Capsule if Inserted Directly)
Contact Rating: 7.4 A @ 120 VAC/3.7 A @ 240 VAC Full Load, 44.4 A @ 120 VAC/22.2 A @ 240 VAC Locked Rotor (Burner/Circulator)
Contact Configuration: SPST
Connection Type: 1/2" Conduit, Quick Connect/Screw
Differential Temperature Rating: 10 Degrees F Fixed (High Limit), 10 to 25 Degrees F Adjustable (Low Limit)
Humidity Range: 0% to 95% Relative, Non-Condensing
Dimensions: 5.1" x 5.2" x 7"
Weight: 4.62 lb.