On 10/02/2018 18:17, Pinnerite wrote:
This is tricky because I cannot supply full details but this is the tale (of
woe).

I really need some informed advice here.

My daughter and her family are waiting to move into a flat that was
previously my mother's. It has the original floor standing Celsia boiler,
inside a kitchen unit. It is conveniently adjacent to the gas meter.

The pipes run horizontally behind the kitchen units, through a wall to the
airing cupboard that houses both the cold tank and a hot water cylinder
beneath it. So the pipe runs are neat and efficient.

Behind the boiler is the pipe to the flu that runs through an outside wall
and can be seen at the front of the building.

The height inside the kitchen unit is 889/890 mm.

A British Gas salesman tested the cold water pressure (it looked pretty
fierce to me) and said, "you cannot have a Combi. Pressures too low".

That does not really make much sense - unless he means flow rate too
low. (the mains pressure even if not that good is going to be higher
than anything you will get from a combined cylinder / cistern on the
same level as the main living space.

His suggestion was to plonk a wall mounted unit on the opposite side of the
sink which clearly meant serious damage to the kitchen units and an
inefficient pipe run.

You could probably stick a wall mounted boiler low down in the space
where the current one is.

The pipe run is less of an issue either way though - everything is fully
pumped, and usually a sealed system these days.


This is a two bedroom flat with a largish main room and the kitchen (316 cm
x 300 cm).

My four bedroom house has a 110,000 BTU boiler, so I would guess the flat
would around 50,000 to 60,000 BTUs (Correct me if I am wrong).

For just heating, its seems likely that a 10 to 15kW (~35,000 to 50,000
BTU/h) boiler will be more than adequate.

If you do go the combi route, the 24kW would be a minimum spec to get an
acceptable rate of hot water delivery. (24kW combi will do once decent
basic shower (i.e. nothing fancy with soaker heads and body jets), or
will fill a bath slowly.

Is there a floor standing boiler that could replace the Celsia?

Gas floor standers are rare these days, and tend to only be the larger
more powerful models. Not really suited to your application.





--
Cheers,

John.

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