In an earlier contribution to this discussion,
Jock wrote:

I bought a gorgeous bath tap with a single joystick lever for hot and
cold water, but I didn't realise that because it's a fancy-schmantzy
European thing it doesn't work well on my UK gravity system. So it
takes forever to fill the bath with hot water; the hot water merely
trickles out.

In the bathroom airing cupboard is a cylinder hot water tank with the
cold water tank combined on top of it. The boiler is in the kitchen
downstairs.

I'm now replacing the old boiler with a combi boiler, to be installed
in the airing cupboard. However, I've read on the FAQs that combi
boilers give a very slow flow to the bath.

My question is: Will a combi boiler make my bathroom tap even worse?

Thanks.

It depends!

Is the cold side of your new tap connected to the mains, and is the flow
from that ok?

If so, you can *potentially* get a hot flow from the combi which is similar
to your current cold flow, because the combi delivers water at mains
pressure.

Your hot flow is currently limited by the low pressure differential due to
the cold header not being much higher than the tap, coupled with the flow
resistance through the tap itself. With a combi, the flow will be limited
only by how fast it can turn cold water into hot water. Make sure you get a
boiler with lots of heating capacity.
--
Cheers,
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