B
Bunker
Older ones are ok, they clearly wern't built by the delinquent welder that caused all the problems. The blue nut underneath has long been replaced by a neat small bottle trap which for years they would post out for free as a replacement.Firebirds may have improved but there are plenty of the older ones around. Another annoying problem is the plastic outlet for the condensate which disintegrates after a couple of years leaving a nasty rusty sludgy mess all over the bottom of the boiler casing, and occasionally messes up the customer's laminate floor around the boiler.