Buffer tank for gas boiler / ufh

[osmononame]

Hi all,

 

The tank/boiler install in my house is due to take place end of the month which means i have to get the orders in for the cylinders etc.

 

On advice of others and some on this forum i have decided to go for a UVC and buffer tank - UVC I will probably purchase off the shelf somewhere in stock and then I will insulate it better myself - as far as the buffer tank is concerned I came across a OSO model on eBay but it lists in the description:

 

'The Accu units are designed to be part of a split system, where the accumulating is done in a separate tank'

 

I don't quite follow what this means? Would one of these be suitable for my application or do i need something else? I tried to contact my plumber but couldn't get through to him today.