Browning B51 Belt 321702-401 while the Watts 40XL-8 features

while the Watts 40XL-8 features an extended 8-inch thermostat designed to be installed in the hot water outlet piping within the allowable distance from the tank top

000 BTU systems to ensure accurate load matching and prevent system hunting

If the blower wheel or fan assembly is damaged

the SWT2979 provides exact factory-set calibration

Browning B51 Belt 321702-401 while the Watts 40XL-8 featuresProfessionals in the field rely on the Browning B51 Super Grip Belt for consistent power transmission in high demand industrial and HVACR environments. This B section wrapped V belt features a 54 inch outside circumference and 52. 8 inch pitch length, engineered with a single fabric wrap construction that enhances belt flexibility and allows for quieter operation compared to raw edge alternatives. Designed to meet strict RMA standards for batch