Fits into existing 2-1/4" top-mount immersion socket (replaces the immersion heater) - provides a secondary coil (actually a loop) with a little under 0.6m2 surface area. This allows solar water heating to be fed into an existing hot water cylinder without the need for a new solar twin coil water cylinder. Smaller units for side-mount immersions, or for non-standard immersions are also available - please call with details.
