While the motor module (the "end cap") can often be the source of failure

Solid-State Reliability: Microprocessor-based design ensures stable performance and precise airflow control

this unit is designed to handle hot or chilled water and water-glycol solutions up to 50% concentration

Using a silicon carbide glow bar

Resideo V8043E1145 Valve 321894-708 While the motor module (theThe Resideo V8043E1145 Valve is a professional grade 3 4 inch NPT motorized zone valve engineered for high demand hydronic heating systems. Specifically designed for closed loop applications, this 2 way normally closed valve provides precise on off control of hot water flow to individual zones. Featuring a forged brass body, a durable stainless steel stem, and a rubber ball plug, the assembly is built to withstand a maximum static pressure of 125 psi