It should be 6.5 lpm for a 50ºC temp rise.
For a 35ºC rise normally quoted for combis, that would equate
to 9.3 lpm.
I don't know what controls that model has, but if you can turn its
temperature down when you don't need very hot water rather than
mixing in cold water a point of use (such as filling a bath), it
will become more efficient at the lower output temperature and
you'll get an even higher flowrate. This trick might not work with a
thermostatic shower mixer though (often they require a multipoint
to be set to max temperature).
Checking and if necessary descaling the heat exchanger is part of
the maintenance procedure. If it scales up, the efficiency and hence
flowrate for a given temperature rise will quickly drop.
I think it`s only got a winter / summer setting...
Don`t think it`s ever been serviced, apart from a thermocouple being
(I started another thread about getting central heating, it isn`t long
for this world, and not worth worrying about !)
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OK. There's a family of them, which also changes over time.
They've basically all got the same burner and heat exchanger
(although not quite identical enough to all be interchangable).
They vary in the controls. A Medway Super has a knob on the
front to set the max temperature (actually, I think it's max
temperature rise). Sounds like your Medway may be a predecessor
with a simpler setting.
Mine died a month before I started installing central heating, so
I had to replace it then and there. Since I then had a brand new
one, I decided to keep it for hot water, and that simplified the
heating. Being very much simpler and more reliable than a boiler,
and not requiring an electricity supply to operate seemed to be
two plus points. I think the old one was over 25 years old when
it died, but it showed signs of having been badly treated at some
stage before I took it on.
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