Morten wrote:

What do you mean by failing to provide constant hot water exactly? (i.e.
it works when the tap is first turned on, but the goes completely cold,
or does it run warm but not as hot as when you started etc).


Get a thermostatic mixer valve inbetween the boiler DHW out and the hot
water taps, that will minimize the temperature swings, but will not do
anything to the boiler not being able to keep up with a large load!

If there is no hot water coming from the boiler then a thermostatic
mixer is not going to do anything useful, it can't heat the water!

Combi boilers are a good idea on paper, because they make for a very simple
installation (ie. you can get rid of the DHW tank) but are seldom up for the
job simply because they cannot provide enough hot water when you want to
take a good long shower.

Sorry, but that is nonsense really. One of the things that most combis
are very good at is showers. The time they can be poor (the lower
powered ones at least) if providing the high flow rate of water required
to run a bath quickly, or to provide for several users simultaneously.

I have this in another thread, but briefly if I try to run a
bath (however slowly) the hot tap runs very hot for 30secs
then drops from warm to cold in 5 minutes or so. At best I
can only get half a bath of comfortably hot water.


Then get a thermostatic showervalve, that will use only the hot water
required to satisfy your requirements regardless of water temperature
comming from the boiler. The boilr will still have to be able to keep up
with your use of hot water, but you don't get scalded and then waste a lot
of hot water waiting for it too cool down or waste it trying to get the
shower set correctly.

He would be better spending the money to get the boiler to work. If it
is a combi, it obviously has a fault.


--
Cheers,

John.

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