"Alan Braggins" wrote in message
...
In article , Doctor Drivel wrote:

????? Fit 300 litre and is less than 15 litre?

No, 15 litres is 15 litres or less.


But tell me more about the servicing requirements. When Nu-Heat replaced
my failed vented heat bank with an unvented one because they didn't do
vented ones any more, no servicing requirement was mentioned.

Nu-Heat
Look at the presurised thermal store (heat bank really):
[...]
Nu-Heat use a plate heat exchanger, not
an ingeral coil, so no G3.

That's not true of all Nu-Heat supplied stores.
Mine has a coil. (In fact two, one DHW, one
underfloor heating.)

The one with the plate heat exchanger does not come under G3. If you have
an internal DHW take off coil and it is pressurised, it comes under G3.
That is pretty clear.