"Alex" wrote in message ...
Is it possible to install and run the above without it being connected to a
boiler and just use the immersion,due to the cost I would like to add the
system boiler and radiators at a later date.

Do you mean an indirect unvented cylinder? If that was the case I
don't know how the installer would complete the benchmark logbook as
it requires various parameters to be logged when commissioning the
system.

I suppose it could be classed as an electrically heated cylinder, but
then you would have to get it all commissioned again when you have the
boiler installed. Otherwise you'll have problems with building regs
and other issues when you sell your house.

Martyn