On Dec 23, 3:34 pm, Rob wrote:

I would telephone Ideal Boilers in Hull for a definitive answer as to
the authenticity of the kit you have fitted to your boiler.

I take your point, but frankly I don't want to drop him in it.

That's an interesting sense of loyalty you've got there - if what he's
fitted is indeed an unauthorised DIY bodge one can only assume he's
probably doing this on other installs too. What if one of these bodges
leads to a situation whereby another owner ends up dying from CO
poisoning due to failure of the flue to vent?

These things ought to be working properly in -20, never mind -5.

They do, but only if installed properly with due consideration for the
effects of persistently-low temperatures.

Mathew