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This 8620-104 relay kit is an official OEM part
These two part numbers are identical in technical specification and footprint
the 4350-040 is a direct functional replacement for many older BJ and legacy Uni-Line commercial thermostats
Can this be used on a 120V system
Tekmar Controls 561 Thermostat R-407C This 8620-104 relay kit isThe Tekmar 561 WiFi Thermostat is a high performance, one stage heat thermostat designed specifically for the rigorous demands of hydronic heating systems, including baseboards, radiators, and radiant floor heating. Operating on 24Vac or 24Vdc, this unit integrates seamlessly with the Watts Home mobile app, allowing for professional grade remote temperature control and system monitoring. The 3. 5 inch color touchscreen interface provides a clear