Sta-Rite MasterTemp Heater Manifold Assembly, SR333, 77707-0015

This is the heater manifold assembly kit for the SR333, Sta-Rite part number 77707-0015. It is sold as a kit rather than as a bare manifold, so the parts that come off with it are all in the box.

What is in the box

The kit contains the coil and tubesheet sealing o-ring kit, the manifold bypass kit, a water pressure switch, a connector tube kit made up of one connector tube and one o-ring, a 428-60 PS zinc plug, the automatic gas shutoff switch, the high limit switch and the thermistor. That covers the water side of the heater and the safety devices that mount on it.

Identify the model first

The source describes this part both as a MasterTemp heater manifold assembly and as the Sta-Rite Max-E-Therm SR333 manifold. Rather than choose between those two descriptions, read the model number from your heater plate and confirm it says SR333 before you order.

The zinc plug

The zinc plug included in the kit is a sacrificial anode. It is a consumable that protects the manifold and heat exchanger from corrosion, so fit the new one rather than reusing the old.