Apart from the display and pcb it is a glow-worm HXI and suprise it is cheaper.No serious problems encountered just the odd noisey one on start-up can be cured by de-ratring fan speed.
Yes it is for an open vented system. Which is cheaper, Glowworm or Vaillant?...are there any better make/models for a similar boiler?
I was going to go for a change to a combi system, but cost, boiler location issues, and the fact combis have more bits that can and do go wrong and is a less DIY friendly system has put me off.
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