"John" wrote in message
...

The Glow Worm Condenser 30CXI is well thought out and uses stainless steel
heat exchanger. The ones I've installed have been no trouble. I can't see
there will be any problems in going up to the 35

And have a look at www.uselessenergy.org.uk for good prices on the Glow-Worm
condensers (I've just fitted one that I purchased through this scheme, and
have been very happy with it so far).

Alex