I had a Glow Worm Ultracom 2CXi installed last Wednesday and by Thursday I had no hot water. The plumber who installed it spoke to Glow Worm technical bods, so they knew which part was faulty, but despite this, the engineer did not have the part on his van! You really couldn't make this up. After forking out a fortune for the boiler, I now have to boil kettles for washing water.
Goodness knows when it will be fixed.
AVOID THIS BOILER LIKE THE PLAGUE! it is a useless lump of junk.