Asbn 15kw 1/3 phase output connection option. When a toilet breaks or a drain clogs, it always seems to happen at the most inconvenient time—though, given our busy lives, there isn't really any time that is convenient! and in those moments, you don't have time to ask, ". It's one of the few boilers we've tested which reaches the very highest efficiency tandards, matching its claims to meet the a sedbuk standard.'. Of those long springy things.