In article ,
IMM wrote:
Two 'instant' water heaters feeding 200 rooms. Turn on the tap in the
furthest one, go to breakfast and come back to warm water.

No. They have re-circ of DHW draw-offs.

Then they're not an 'instant' heater.
Which as you may not have noticed
starts and stops on water usage.

I have told you before, don't comment on a field you know sweet FA about.

Why? You've been doing it for years...

Noted you've not tried to justify your mistake, though.

--
*A closed mouth gathers no feet.*

Dave Plowman London SW
To e-mail, change noise into sound.