"Andy Hall" wrote in message
...

It does answer the Q. Most of the design is inside the box, done by
experts.

Sorry I don't buy that.

After I had hopes for you too, and you say that.

From the high level functional point of
view, the combi is simply bringing into
the box the pump and an
alternative means of providing the hot
water. Granted, it does reduce the
component count vs. a cylinder system.

You are getting there. Or are you? It vastly reduces the design aspect
too.

However, from a *design* perspective,
there is little or nothing involved in
provisioning a vented cylinder, motorised
valve(s) and pump.

There is, especially for a novice.

The only design is the rad sizing and the pipe run. Not
difficult.

No it isn't,

It is easy enough, and about the only complex part in fitting a combi.

One pipe run is trivial, when looking at the whole system.

That depends on where it has to run

It is not a Middle East oil pipeline.




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