require a boiler for new installation of a large property. Been recommended Keston and Veissmann. Had a look and the KESTON C55 and Vitodens 200-W fit the bill.
I don't know alot about Viessman but I here good things. Keston on the other hand....well lets just say as primarily a service/repair engineer I should be thanking them for the many years of constant business I wouldn't wish a Keston on my worst enemy tbh. How they continue to develop such unreliable pieces of junk with ludicrously expensive spares is quite a mystery, but they do.
As above, Viessmann is a quality boiler, and Keston is a disaster waiting to happen.
Besides that, anyone offering Keston's should be viewed with suspicion.
Viessmann give a full 5 year warrantee, IF the installer is approved by them. You become an approved installer if you go to their course, and take the boiler to bits so you know how they stick together, what to do with them, and what not.
Viessmann do not require minimum numbers of turnover/installations like some manufacturers.
I look after a boiler house in London with 22 C55's!! by the time you have gone through them repairing & clearing endless fault codes, its time to start again endless trouble DO NOT BUY A KESTON
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