the door prevents accidental setting changes and protects the control interface from moisture and dust

Use a multimeter to check for continuity across the terminals when the switch is cold

OEM Reliability: Direct manufacturer replacement (Part Number 510-300-013) designed specifically for spark ignition gas boilers

Corrosion-resistant steel construction stands up to high-temperature HVAC exhaust environments

Hydrolevel EW201 Electro-Well the door prevents accidental settingAs a seasoned technician, you know that a Hydrostat controller is only as good as its interface with the boiler water. The Hydrolevel EW201 Electro Well (Part Number 48 201) is the specialized 3 4" NPT immersion well required to unlock the Low Water Cut Off (LWCO) functionality on Fuel Smart Hydrostat models. Unlike standard brass wells that only transfer temperature, this Electro Well features a patented design with an integrated electrical insulator