"Andrew Beck" wrote in
:

Solution Ideas, will the work?

1) A pressure equalisation valve on the hot and cold water supplies?

2) replace the cold water supply pipe to the main pipe in the road as
the input in to the house is only 15mm
Not really an option.

3) run the cold of a tank in the loft that is pumped?

4) run the cold and combi of a tank in the loft that is pumped?
Before the combi was installed by the previous owner there was a cold
water tank in the loft.

I think option 3 and 4 have a chance.

I may be talking rubbish, but I think a pumped supply from a reservoir
tank would help.

Perhaps if you ran the cold off the main, and the combi off the tank
with a pump, you would get a result.

My only experience(!!) is only running a pumped electric shower off the
cold tank because of crosstalk between the shower, bog cistern, cold
taps etc.

This has provided a perfectly buffered feed, and on a larger scale might
suit you.

You would need a suffieciently beefy pump (not a problem, I think) and
be sure the cold tank is big enough to take up the slack while the combi
is in use, perhaps lots of baths would require a big tank.

mike