Heater 3kW, 220-240V for spas that use the Balboa M7 control system.

Dimensions
Length: 381 mm (without connectors and gaskets)
Internal diameter : 53 mm
Usually connected to 2 inch or 63 mm pipe

The Balboa M7 (or Millenium 7, as it was originally known) control system uses two very sensitive temperature probes inside the barrel of the heater itself to detect the rate of water flow. This makes it much more reliable, in our experience, than competitive systems that use failure-prone moving parts instead, such as pressure switches or flow switches.