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no dont think they are but they are painted so any tool on them will wreck them why do you want to top entry it anyway
yes try it o.4
i would say the bypass is set too low it will easily overcom 0.2/3 of a bar try with it higher set it higher until you find the right setting
you need to speak to ofgem and get the complaints procedure rolling
i like them they are neat don't discolour copper (no heat), no flux. they are not cheap but not far from plastic pricewise so you have to check...
Complain about your gas or electricity bill or supplier
i had a problem not the same but it was a new build and all paperwork passed to suppliers when we move in i phoned and emailed the suppliers for...
why not go wiyh low loss header vaillant boiler and the vailalant controls rally easy to multizone
contravenes gas safety regulations and nulls all warranties
one of those brass ones
what boiler vaillant is really good with this using their controls makes wiring easy
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