On 9 Mar 2004 05:45:32 -0800, (Ben Freeman)
wrote:

I've just been chatting to a loft conversion company about loft
conversions and they seem to be of the opinion that I shouldn't try
and extend my open pumped CH system to the loft - but as far as I can
see all I need to do is raise the header tank to be above the loft
rads (all be it not by much) and it should just work.

Has anyone done this - does it work efficiently?

The builder seems to favour scrapping my perfectly functional boiler
and going for a new combi sealed system - which seems to me rather
over the top.

Thanks,

Ben

There are a couple of options here.

1) You can certainly do what you've described as long as the pipework
is organised properly from the header tank to the rest of the system
to avoid pumping over of water or sucking down of air. This means
that the feed pipe and the vent pipe must reach a point directly
connected to the boiler (no motorised valves in the way) no further
than about 150mm apart. Alternatively you can use a special venting
device such as a Myson Aerjec

www.bes.ltd.uk part 11334

The other piece to this is that you need a minimum head from the tank
to the top of the highest radiator. Most boiler manufacturers say
0.5 to 1m - you need to check.

In a former house with an attic bedroom and loft next to it, I was
able to site the tank up quite high and used a long 300mm high
radiator to get the head to an adequate level.

2) If the boiler permits it, you could convert the whole system to
sealed operation. Look for Ed Sirett's FAQ on doing this.
It would be a very easy job and removes the issue completely.

I suspect that the builder is talking up the value of the deal.......





..andy

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