Solar PV diverters

Immersion Controllers

Solar immersion controllers, also known as solar PV diverters, use surplus solar generation to heat water through an immersion heater instead of exporting all of that excess electricity to the grid.

The two most popular options we stock are the Marlec Solar iBoost+ and myenergi Eddi V2.1. Both divert surplus solar into hot water, but the Eddi adds built-in Wi-Fi and app control.

Simple & effective

Marlec Solar iBoost+

A straightforward solar immersion controller for customers who want automatic surplus diversion without needing an app.

  • Diverts surplus solar from around 100W up to 3kW
  • Supports two immersion heaters
  • Can work alongside battery storage
  • No built-in Wi-Fi or smartphone app
  • Optional iBoost+ Buddy for in-home monitoring and Boost control
View Solar iBoost+
Wi-Fi & app control

myenergi Eddi V2.1

A more connected solar diverter with built-in Wi-Fi, remote monitoring and control through the myenergi app.

  • Diverts surplus solar to hot water
  • Built-in Wi-Fi and Ethernet
  • Monitoring and control through the myenergi app
  • Supports two heaters sequentially
  • Useful for customers already using other myenergi products
View myenergi Eddi
Which should I choose? If you simply want to use surplus solar to heat water, the Solar iBoost+ is a strong, simple option. If Wi-Fi, smartphone control or wider myenergi integration matters to you, choose the Eddi. You can also browse all immersion controllers below.

Showing all 8 resultsSorted by popularity