heatline vizo = 299. flue = 25. bypass valve = 20. so 445 quid. the only difference between the cost of vizo and say a 24kw baxi is the vat.id go for the baxi. by the way glow worm have bought heatline.
Vaillant own Glow Worm, so Vaillant have bought Heatline. Quite a few new builds fit Heatlines. The top model has Giannoni heat exchanger, Grundfos pump, etc.
just walk on to a few sites where they are doing projects.
most of them will do anything they can get away with to save a penny, quality absolutely not an issue. ever seen the plastic heating pipe they use? i've seen french letters that were thicker