ImmerSun Solar Water Heater


The immerSUN is our ‘state of the art’ energy saving device. It helps you to self-consume the green energy produced by your microgeneration system, and is compatible with all renewable generation technologies, including solar PV, wind turbine and hydro systems.

The device is essentially an automatic power controller that diverts surplus power to a designated load, normally a hot water heater, to save energy and minimise your utility bills.

Compatible with all inverters, smart meters and energy monitoring systems, the immerSUN boasts an extensive range of additional features. This controller really is the perfect addition to any PV or wind turbine installation.

Once the ImmerSUN is installed, the next-generation system will reduce an average household’s energy bill by up to £250 per year. This is done by diverting microgen-generated electricity directly to an immersion heater, storage heater, and/or electric underfloor heating. This helps users to significantly reduce their utility bills, lower mains reliance and improve the eco credentials of their property, without affecting FiT payments.

Key Benefits:

  • Tracks surplus power and diverts this energy to the load
  • Technology for fast and smooth automatic power adjustment
  • Clear graphical backlit LCD display
  • Indicates current import/export power levels as well as diverted power to the heater
  • Savings are accurately reported for the day and each month as well as the total savings
  • No need to change the existing immersion heater
  • Built-in 7-day programmable boost timer
  • Savings can be displayed in several currencies as well as kWhs
  • Manual boost function for both heater outputs
  • Integral multi-function relay
  • Up to 4 immerSUN’s can be wireless linked for larger systems
  • Fully short circuit protected in case of load fault
  • Overload protection
  • Power factor correction
  • Soft starting to avoid power surges and extend heater life
  • Complete CE product approvals
  • 3-year product warranty
  • Efficiency (%): 98%
  • Length (mm): 235 mm
  • Width (mm): 152 mm
  • Depth (mm): 72 mm
  • Weight (Kg): 2.5kg


ltimate freedom to choose where you place your IMMERSUN with this sensor

Accurately calculates your available free power

Measures electrical data in real-time

Smooth and reliable connection

Won’t run out of battery – it doesn’t need any!

Completely Wireless


Control your IMMERSUN at the touch of an app!

Track your power usage when you’re away from home!

See when your water is Hot enough to use!

Records all of your past savings!

Data is updated 9,000 times a day!