"Mark Dumbrill" wrote in message
...
"Doctor Drivel" wrote in message
...
It is no good putting a modern boiler on an outdated DHW/CH system. Go
for gold.

I'm interested in what you define as an outdated DHW/CH system. For
instance I have a Y plan system with a Honeywell optimising thermostat. If
I installed a new boiler what changes, other than a more efficient bolier,
is going to make a difference?

There was clues.
Is your cylinder a quick recovery type?
Are your rads rated for a 60-40 temp differential?