On Nov 21, 6:29 pm, wrote:
Dave Liquorice wrote:

[snip, thanks for useful comments]

The only reason for adding the hot water to the stove is that the
kitchen in particular is a *long* way from our existing hot water
cylinder and it takes a huge amount of waste water ...

Are you on a water meter?

Yes, but in addition think about all that wasted heated water.

It seems to be about a sink full of water before it runs hot, that's
quite a lot of wasted heat as much of it will be lost to places where
we don't need the heat (under floorboards etc.).

could change it to microbore? and/or insulate the existing copper or
insulate a new run of plastic Hep20 ??

Jim K