There is a pump next to the water tank. There is also an internal pump in the boiler according to the manual (see attached item 69 & 70) which further confused me.
Ok so i'm hoping im being a bit thick with this and missing the obvious so please bear with me.
Our current boiler is an old Ideal ICOS HE15, Standard 10yr+ underpowered newbuild boiler.
Its dying and beyond economical repair from what the guy who came to service it told us, so its upgrade...