"Ben Freeman" wrote in message
om...
"Chris O" wrote in message
...

My loft room is only 2m high at the highest point. The header tank is in
there as high as it can go and the new rad in there works fine. Kept my
existing (12year old) boiler and the whole CH system works well still.
My
builder was against putting in a combi system as he reckoned I would
probably get leaks elsewhere due to the increased pressure and (not
unreasonably) he wasn't prepared to be responsible for fixing existing
pipework. I certainly didn't see any point in replacing everything to
avoid
that.

I think I'll go for keeping my current system with a raised header
tank and only convert to sealed if it proves problematic.

Cheers for all the advice.

Ben,

Firstly a Neatheat is an old very inefficient boiler with some parts now not
available. While at it, it is best to get rid of this and install a modern
high efficient boiler. If you install a condensing boiler your gas bills
will drop approx 30-40% from what you currently pay, and even more when the
extension is fitted. Also while you are at it, install thermostatic rad
valves on al the rads and replace the lockshield valves on the other end of
the rads. In short revamp your system. It will obviously cost you more,
but worth it in the end, as you will have to go through this process sooner
or later, and most probably sooner with an old Neataheat. Best get it all
out of the way and pipes hidden with the extension, etc.

A Neataheat cannot have a sealed system.

How many bathrooms have you got, and how many will there be when the
extension is complete?