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The VTC Thermostat 140F is a required component of the VTC Thermostatic Load Valve ("TLV"). This is the thermostat only, not the valve. The TLV is a required installed component for every high efficiency outdoor boiler installation. The purpose of the TLV is to ensure that the boiler water jacket temp does not drop below 140 degrees.

Contact OutdoorBoiler.com for installation instruction guide.