Load Unit designed to maintain boiler (hydronic fireplace) incoming temperature through a thermostatic valve. It prevents low-temperature corrosion and boiler fouling. Consists of a Wilo Yonos PARA pump, pump shut-off ball valve, thermometer, TSV3 valve and insulation. The TSV3 valve features no automatic bypass closing, so a balancing valve shall be fitted on the B inlet. Available options with 65 or 72°C opening temperature. For boilers up to 25 kW.