On 20/05/2017 18:38, Scott wrote:
On Sat, 20 May 2017 13:35:45 +0100, Terry Casey
wrote:

[snip]

I installed a combi boiler (Worcester Bosch) last year and I am a bit
disappointed with it.

24kW by any chance?

(makes for dismal bath filling - but will do a "twice as good as the
best electric" shower)

The water takes a while to heat up when using Eco mode. I mostly run
without Eco mode (pre-heat is capable of being programmed) so I assume
I am using extra energy to save water.

Not much value in ECO mode really - it only fires fairly infrequently to
temper its small store of hot water.

The bath takes ages to fill. This may however be related to having an
unusual thermostatic mixer tap arrangement that serves the bath and
the shower.

Or an underpowered boiler...

The radiators warm up even when the heating is supposed to be off. I
understand this is because the boiler uses the heating as a heat sink
when it is pre-heating the hot water. Again, I assume this means
wasting energy.

That sounds more like a faulty diversion valve.

I find the extractor system noisy for a domestic application, but this
may be common to all condensing systems.

Extractor system?

(do you mean a fanned flue? If so, a standard feature of any boiler you
can buy today - although some are louder than others)

The hot water even at its maximum setting is not hot enough. It's
okay for filling sinks and baths in the first place but for a top-up
it is fairly ineffective.

The washing machine is cold fill so this is not an issue. I think
nearly all washing machines are cold fill, so probably your next one
will be. Could you not disable hot fill if this would help?

Depending on how well the plumbing is done you can get temperature
interactions even from cold fill only - especially of the WM cold feed
is taken from the pipe before the cold feed to the combi. Really it
wants to be plumbed with that being the first thing to be taken off from
the incoming main.


--
Cheers,

John.

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