On 4 Aug 2005 02:50:04 -0700, "richman"
wrote:

We converted a five bed house in London for students and the plumber
put in a gas Vaillant turbomax plus 828 to serve a shower and a bath.
All the old pipe work from the old conventional system is still insitu
just blanked off. Frankly the combi is just poor; baths are just not
worth having and the shower flow is disturbed so much by washing
machines, dishwashers etc.I thought I could get away with it because we
all know students dont wash but this lot do....

I have read what you all say about combis but think that they are
useless for more than one old lady in a flat, I am afraid.

We now want to put in a an en suite shower room on the second floor,
exactly where the old airing cupboard/immersion heater was. The boiler
is on the ground floor in the kitchen and the existing bathroom is on
first floor.

I want to put a megaflow or similar unvented storage with an upgraded
new boiler.

The vaillant is nearly new and I wonder if some clever internal
rearrangement will turn it into a sealed system boiler or should I just
bite the bullet and buy a new proper one.

What do you reckon?


You could pension off the combi into just feeding part of the
requirement such as washbasins or sinks perhaps - depending on the
plumbing arrangements.

You can then use the CH part of the combi in the same way as any other
boiler to provide heat for the cylinder's heating coil. This
requires a diverter valve, thermostat and possibly a timer/programmer.
No big deal and nothing lost.

Before you do this, however, do check the cold mains flow rate and
pressure and make sure that they are adequate. Typically a combi has
poor performance when its power rating is inadequate for the
requirement - simple physics of heat transfer. However, if the water
flow rate is also low, then a pressurised cylinder wouldn't help and
you would need to use a system with roof supply tank.






--

..andy

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