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Small cylindrical metal tank with threaded brass fitting

Watts

Watts ETX60 1/2" Diaphragm Expansion Tank 66607

SKU CH-9WP1-Z56J1

A 1/2" diaphragm expansion tank absorbs thermal expansion in closed water-heating systems

  • TypeWater Heaters
  • Diaphragm design absorbs thermal expansion in closed water-heater systems
  • 1/2-inch connection fits standard residential plumbing
  • Watts brand ensures reliable pressure control
  • Model 66607 replaces legacy ET60 units
  • Ships ground to meet carrier requirements

Diaphragm Expansion Tank 66607

The Watts ETX60 is a diaphragm-type expansion tank designed for residential water-heater installations. It absorbs pressure increases caused by thermal expansion in closed plumbing systems. The 1/2-inch connection fits standard supply lines. This new component replaces the earlier ET60 model.

Sustained Pressure Management

The diaphragm separates system water from a pre-charged air cushion, allowing the tank to accept expanded water volume continuously during heating cycles. By maintaining equilibrium, it prevents pressure spikes that can trigger relief-valve discharge or stress pipe joints. The design supports repeated daily expansion events without loss of function.

Thermal and Hydraulic Stability

Normal operation keeps the tank at system temperature with minimal heat loss through the shell. No moving parts or powered elements mean silent performance and zero electrical draw. The sealed diaphragm eliminates waterlogging, so the air charge remains stable over extended service intervals.

Highlights

  • Diaphragm design absorbs thermal expansion in closed water-heater systems
  • 1/2-inch connection fits standard residential plumbing
  • Watts brand ensures reliable pressure control
  • Model 66607 replaces legacy ET60 units
  • Ships ground to meet carrier requirements

Specifications

BrandWATTS
TypeWater Heaters

Questions about this item

How much noise or heat does the Watts ETX60 produce during continuous operation?

The Watts ETX60 is a passive diaphragm expansion tank with no moving parts, so it generates no noise or heat during all-day operation.

What plumbing connection must already be present for the 1/2" Watts ETX60 to install?

A 1/2-inch threaded fitting on the cold-water supply line is required to thread the ETX60 directly into the system.

Will the Watts ETX60 model 66607 work with an older Watts ET60 mounting setup?

Yes, the ETX60 is designed to replace the ET60 and fits the same 1/2-inch connection points used by the older tank.

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